In addition, proponents and land managers should refer to the Recovery Plan (where available) or the Conservation Advice (where available) for recovery, mitigation and conservation information.
|EPBC Act Listing Status||Listed as Vulnerable|
|Listing and Conservation Advices||
Commonwealth Listing Advice on Neoceratodus forsteri (Australian Lungfish) (Threatened Species Scientific Committee, 2003j) [Listing Advice].
|Recovery Plan Decision||
Recovery Plan required, included on the Commenced List (1/11/2009).
|Adopted/Made Recovery Plans|
|Policy Statements and Guidelines||
Survey guidelines for Australia's threatened fish. EPBC Act survey guidelines 6.4
(Department of Sustainability, Environment, Water, Population and Communities (DSEWPaC), 2011i) [Admin Guideline].
Information Sheet - Australian Lungfish (Neoceratodus forsteri) (Environment Australia, 2003ab) [Information Sheet].
Federal Register of
Inclusion of species in the list of threatened species under section 178 of the Environment Protection and Biodiversity Conservation Act 1999 (04/03/2003) (Commonwealth of Australia, 2003h) [Legislative Instrument].
|Scientific name||Neoceratodus forsteri |
|Species author||(Krefft, 1870)|
This is an indicative distribution map of the present distribution of the species based on best available knowledge. See map caveat for more information.
The current conservation status of the Australian Lungfish, Neoceratodus forsteri, under Australian and State/Territory Government legislation is as follows:
National: Listed as Vulnerable under the Environment Protection and Biodiversity Conservation Act 1999.
Queensland: In Queensland, the Australian Lungfish is not listed as threatened under the state's Nature Conservation Act 1992, however, the taking of Australian Lungfish has been prohibited since it was declared a protected species under the Queensland Fish and Oyster Act 1914. The species is currently protected from fishing, and collection requires a permit under the Fisheries Act 1994.
Scientific name: Neoceratodus forsteri
Common name: Australian Lungfish
Other common name: Queensland Lungfish
Populations of Lungfish exist in the Mary and Burnett Rivers and are not genetically distinct from one another. Genetic evidence suggests that a translocated population in the Brisbane River is derived from the Mary River (Frentiu et al. 2001).
The Australian Lungfish is a long, heavy-bodied freshwater fish. The species has five pairs of gills and its fins resemble flippers. Adult Lungfish can weigh up to 48 kg and grow to around 2 m (Environment Australia 2003ab; Grigg 1975), but commonly reach 1.3 m. In the Burnett River, the mean length was 906 ± 199 mm, and the mean weight 7573 ± 4563 g (Brooks & Kind 2002). Adult Lungfish are olive-green or grey-brown above, and yellow-orange below, with some whitish colour on the belly and underside of the head. They have large, overlapping scales and a small mouth with large, crushing teeth on the palate and lower jaw (Allen 1989a; Grigg 1975). Juveniles are dark olive, brown or yellow with a mottled pattern above and a dull pink belly (Kemp 1995; Kind 2002).
The species is able to breathe aquatically using its gills, and aerially using its single lung. It usually uses its gills, but surfaces to breathe when it is active and requires more oxygen. For example, it breathes air more often at night while foraging, when swimming in floodwaters, and when spawning (Grigg 1964, 1975; Kemp 1984; Merrick & Schmida 1984).
The Australian Lungfish is restricted to south-eastern Queensland (Wager 1993). It currently occurs in the Burnett River, the Mary River, the North Pine River (including Lake Samsonvale) the Brisbane River (including Lake Wivenhoe), and Enoggera Reservoir (Brooks & Kind 2002; Johnson 2001; Kemp 1995). Its natural distribution is the Mary and Burnett River systems. It was translocated and persists at a number of other sites, and the Condamine River west of the Great Dividing Range, where it did not persist (O'Connor 1897). In 1995 Kemp reported that there were Lungfish in the Gold Creek Reservoir and Lake Manchester, in the Brisbane River drainage area. By 2001, Johnson found there was no evidence that they persisted in these dams, in the Coomera River, in the Logan River or its tributary, the Albert River.
The distribution of Lungfish within the Burnett River is from Ben Anderson Barrage to a point around 10 km upstream of the John Golby Weir (around 335 km from the mouth of the river). It is most abundant between Ben Anderson Barrage and a point 275 km upstream. It also occurs in tributaries of the Burnett River:
- In Three Moon Creek to around Mulgildie.
- 20 km up the Boyne River from its junction with the Burnett River as far as Boondooma Dam, including the waterhole directly below the dam wall.
- Barambah Creek, but not in the upper reaches above Barambah Gorge. Brooks (1995) suggested that they may occur above the gorge to at least the Joe Sippel Weir, but Books & Kind (2002) found no evidence of the species above Barambah Gorge.
- The lower reaches of the Auburn River below the falls/gorge.
(Brooks 1995; Brooks & Kind 2002).
Kind (2002) caught and observed Lungfish on the Burnett River at sites including Ben Anderson Barrage, Bingera Weir, Lee's Waterhole, Drinan's Crossing, Walla Guaging Weir, Booyal Crossing, Mingo Gorge, Grey's Waterhole, Booyal Crossing (immatures), and Jones Weir. Grigg (1975) observed Lungfish spawning at Bon Accord Crossing over Barambah Creek, in 1964.
The distribution of Lungfish within the Mary River is from the Mary River Barrage (59.3 km from the mouth of the river) to the town of Conondale (220 km from the mouth of the river). It also occurs in large tributaries of the Mary River:
- Yabba Creek, which flows into the Mary River between Kenilworth & Gympie.
- Tinana Creek, Coondoo Creek, Wide Bay Creek, Obi Obi Creek, and Munna Creek (Brooks and Kind, as cited in Kind 2002; Simpson 1994).
Kind (2002) caught and observed Lungfish on the Mary River at sites including Kenilworth Homestead, Kenilworth Quarry, Moy Pocket, Traveston Crossing, and Widgee Crossing at Gympie. He also caught them at Imbil Bridge and near Imbil Weir (a subadult) on Yabba Creek, Bungawatta on Tinana Creek, and in Condoo Creek.
O'Connor (1897) translocated 78 Lungfish from the Mary River at Miva to:
- North Pine River (eight fish),
- a lagoon near the Albert River (five fish),
- a dam near Cressbrook on the upper Brisbane River (eight fish),
- Enoggera Reservoir (18 fish),
- the Condamine River (21 fish),
- the Coomera River (16 fish), and
- the Botanic Gardens in Brisbane (two fish).
The Australian Lungfish was comprehensively surveyed in the Burnett and Mary River systems between 1997 and 2002, but the status and distribution of the translocated populations is based on anecdotal information and sporadic records (Brooks & Kind 2002, Kind 2002).
The total Australian Lungfish population is fewer than 10 000 individuals (Catalyst 2006).
There are two major populations of the Australian Lungfish, occurring naturally in the Burnett and Mary Rivers.
Anecdotal information suggests that there is also a large translocated population in the Brisbane River. Numerous large individuals are seen in the Wivenhoe dam on the Brisbane River, downstream to the Mt Crosby Weir. There are two further moderate populations that show irregular evidence of recruitment; the Enoggera Reservoir, and the North Pine River. There are 'moderate numbers' in the North Pine River, and Lungfish are often caught and reported by anglers downstream at Young's Crossing after water flows over the top of the dam. In the 1980's and 1990's, Lungfish were regularly found at the base of the Enoggera dam wall after floods. The status of translocated populations of Lungfish in the Logan River, Coomera River, Gold Creek and Lake Manchester is uncertain; it is likely to be very rare or extinct at these sites. It is almost certainly absent from the Condamine River (Johnson 2001).
The Australian Lungfish requires still or slow-flowing, shallow, vegetated pools with clear or turbid water in which to spawn and feed (Allen 1989a; Merrick & Schmida 1984). The species is restricted to areas of permanent water (Brooks & Kind 2002) and cannot live in saline waters or migrate through sea water (Arthington 2008).
Burnett River and tributaries
The Burnett River flows for around 420 km from its source to the sea. Brooks & Kind (2002) reported that Lungfish were often found in freshwater reaches of the Burnett River up to 310 km inland from the river mouth, and less frequently found upstream of this point. At sites between 50 and 350 km upstream, the abundance of Lungfish was negatively correlated with the distance from the mouth of the river (fewer lungfish further away from the sea), except for the relatively small population in Ben Anderson Barrage pond near the river mouth. Based on the catch rate per unit effort, Brooks and Kind (2002) concluded that Lungfish were less likely found in impoundments than in flowing stretches of the Burnett River.
In the lower Burnett River, Ben Anderson Barrage pool is the closest water storage to the sea (26 km away). It usually consists of 41 km of impounded slow-flowing water surrounded by steep banks (Kind 2002). Bingera Weir is 42.5 km from the sea, so it is usually inundated by Ben Anderson Barrage pond. When it is not submerged, it impounds 19 km of the river above Ben Anderson Barrage. There is a section of the river upstream of Ben Anderson Barrage pond consisting of 7 km of flowing water with shallow runs up to 32 m wide, and riffles around 4m wide, up to Ned Churchward Weir (formerly called Walla Weir). Ned Churchward Weir (74.5 km from the river mouth) impounds water 34.5 km upstream to a point 109 km from the mouth of the Burnett River. Within the Ben Anderson Barrage pond, there were more Lungfish in the headwater section, where there were shallow areas and more complex habitat (Berghuis & Broadfoot 2004a; Brooks & Kind 2002).
The central Burnett River area contains three irrigation storages that are impassable to lungfish in normal flow conditions (John Goleby Weir, Jones Weir and Claude Wharton Weir). Unimpounded sections of the river include many shallow pools and runs with a width of less than 10m, containing submerged logs and branches (Brooks & Kind 2002). Rocks are more common in the Burnett River than the Mary River, and are used as shelter by Lungfish in the Burnett River (Kind 2002). Between Claude Wharton Weir (202.4 km from the river mouth) and the Burnett River Dam (131 km from the river mouth, with an impoundment extending to a point 176 km from the river mouth) is a section of flowing river, riffles, shallow runs and pools within the Goodnight Scrub, which approaches the natural state of the river (Kind 2002; Sinclair Knight Mertz 2001).
Mary River and tributaries
The Mary River flows for around 250 km from its source in the Conondale Range to the sea. In the Mary River, Kind (2002) found that shallow pools, runs and riffles were common, and there were few waterfalls. Areas where Lungfish were studied consisted of 67% pools, 21% runs, 11% riffles and glides, and 1% backwaters. The average pool depth is 1.8m, the average run depth 1.2 m, and the average stream width less than 30 m. In pools where adult Lungfish were studied, macrophytes (water plants that are large enough to be seen with the unaided eye) covered 37 to 55% of the habitat (mean 47%), around 40% was open water, and the rest was stream bank vegetation (including grass growing into the water), rocks, eroded banks and woody debris. The substrate was typically sandy. Macrophytes were most abundant at depths of 0.9 to 2.1m.
Yabba Creek is regulated by water releases from Borumba Dam (31.1 km from the junction with the main channel of the Mary River) and Imbil Weir (10.9 km from the junction). The average depth of Yabba Creek is 1.7 m and there is abundant overhanging vegetation, submerged macrophytes and rocky cover. Lungfish in the Mary River catchment were also less abundant in the impounded waters than further upstream. Tinana Creek is 140 km long. It flows into the Mary River downstream of the Mary River Barrage. The lower section is regulated by Tallegalla Weir (37.5 km from the junction), Teddington Weir (15.8 km from junction), and Tinana Barrage (1.5 km from the junction). The average depth of Tinana Creek is 1.7 m, and it is generally less than 10 m wide. It comprises a series of pools, runs and riffles, and there is abundant overhanging vegetation and submerged woody debris, but little macrophyte vegetation in the water (Kind 2002). Coondoo Creek is 70 km long, and flows into Tinana Creek 75 km from its junction with the main channel of the Mary River.
Adult Lungfish in the Mary River are associated with overhanging riparian (riverside) vegetation, woody debris in the water, and dense macrophyte beds. They shelter in complex, shaded habitat. They most prefer habitat with overhanging vegetation and macrophytes in relation to their availability, and often use habitat with woody debris, although adults are not as reliant on submerged branches as some other Australian freshwater fish. The species avoids open water, and very seldom uses rocky habitat and eroded banks, which are uncommon in the Mary River. Lungfish are usually inactive when located in overhanging riperian vegetation and woody debris, especially during the day. They occur in water that is 1.86 m ± 0.61m deep on average, and in deeper water in winter than in summer (2.07 ± 1m m versus 1.81 ± 0.82 m). They use shallower water in the spawning season than at other times (1.77 ± 0.95 m), and slightly deeper water during the day than at night. Adult lungfish use water depths of 2 to 3 metres. Two macrophytes, Vallisneria Vallisneria gigantea and Hydrilla Hydrilla vertillata were used by all Lungfish radio-tracked in the Mary River, but Kind (2002) did not find any adult Lungfish using the macrophytes Baby Tears Bacopa monniera, Nitella Nitella sp., watermilfoils Myriophyllum spp., or hornwort Ceratophyllum demersum. In relation to their availability, Lungfish preferred some species of macrophytes over others; they preferentially used two species that form very dense submerged banks and occur in a range of water depths; dense water weed E. densa and Hydrilla. They also prefer multi-species mixtures of floating and submerged macrophytes, and two species with floating leaves; water primrose L. peploides and waterlilies Nymphoides sp. (Kind 2002).
Enoggera Reservoir is a permanent body of water around 60 ha in area and 18 m deep. It is filled by springs in the D'Aguillar Ranges and drains into Enoggera Creek, which drains into the Brisbane River estuary. The bottom of the dam is mainly mud, covered with detritus from water lilies and Eucalyptus leaves. The water is clear, but stained brown by tannins from decomposing leaves, and slightly acidic (pH 5). It has steeply sloping sides with Para grass Brachiaria mutica growing out from the edges to a water depth of around 2 m, forming a dense floating mat along with some aquatic macrophytes. Macrophytes are generally absent from the reservoir except at the edges. Water hyacinth has been controlled in the Reservoir since 1974 (Kemp 1986). Kemp (1986) considered that Enoggera Reservoir is a poor environment for Lungfish.
The upper reaches of the Brisbane River consist of two water storages, the Somerset and Wivenhoe dams (Kemp 1986). Below these dams, the river forms wide, slow-flowing permanent reaches with a maximum depth of around 4.5 m, and occasional shallow riffles. The riverbed consists mainly of sand, gravel and rocks, and the water is clear to turbid (after rain), with a nearly neutral pH (8). Red Bottle-brush Callistemon saligna and She-oak Casuarina sp. trees overhang the banks, and their root masses grow in the water, contributing to spawning and shelter habitat for Lungfish. Aquatic macrophytes are abundant (Kemp 1986).
Habitat requirements for juvenile and immature Lungfish
With one exception (a juvenile caught in 1 m of clear water, Kind et al. 2005), juvenile Lungfish have always been found in dense cover such as beds of macrophytes in water 500 mm deep or less. Observations of captive-bred juveniles showed that they prefer macrophytes over other shelters, and use the densest macrophyte cover available, especially if it is shaded. It appears that wild juveniles remain in the same type of cover as that used for spawning for many months or years after hatching (Kind 2002). One was found sheltering amongst river macrophytes (Semon 1899, as cited in Brooks & Kind 2002), and seven were recovered from the roots of water hyacinth plants removed from Enoggera Reservoir (Longman 1928, as cited in Brooks & Kind 2002). Brooks & Kind (2002) caught 21 juveniles and saw nine others at Drinan's crossing on the Burnett River, in macrophytes near where they found 293 hatched Lungfish eggs. They also caught two juveniles at Gayndah on the Burnett River, where they found three hatched eggs. All of these juveniles were in dense macrophytes in water less than 500 mm deep. Kind et al (2005) caught two juvenile Lungfish in dense aquatic vegetation and debris in 300 mm of water in the upper reaches of Jones Weir. Brooks & Kind (2002) caught two juvenile lungfish at Traveston Crossing on the Mary River amongst Hydrilla and Nymphaena plants in 500 mm deep water, and one at Twin Bridges on the Brisbane River amongst Vallisneria gigantea and woody debris. All juveniles smaller than 100 mm were caught in habitat suitable for spawning.
The largest juveniles were found in a macrophyte species that are rarely used for spawning (H. verticillata), in the largest macrophytes, and in the deepest water. Larger juveniles inhabited larger macrophytes at greater depths. Immature Lungfish between 300 and 700 mm long were found most often associated with overhanging streamside vegetation, in areas of dense woody debris, undercut banks and dense macrophytes. The average water depth used by immature Lungfish during the day was around 1.5 m (Kind 2002).
Brooks & Kind (2002) reported that Lungfish gathered in deeper water within the Burnett River in autumn, possibly in preparation for the dry season. Unlike the African and South American Lungfish Protopterus and Lepidosiren, the Australian Lungfish does not use stagnant mud as a refuge during dry seasons or droughts. It cannot live in stagnant water or bury itself in mud. Surveys conducted before major impoundments were built showed that even during prolonged drought, parts of the Mary and Burnett Rivers inhabited by Lungfish still flowed slowly and pools were well-oxygenated (Grigg 1965).
The Australian Lungfish first breeds at around 15 years of age in males and 20 years in females (Kind 2002). Hatchlings and juveniles are vulnerable to predatory insect larvae, shrimps, fish (e.g. jewfish), and wood ducks (Bancroft 1928; Illidge 1894; Kemp 1987). Adults have few or no natural predators (Kind 2002). They are difficult to age accurately, because growth rings on scales become difficult to interpret as growth slows in old fish, and otoliths (structures in the inner ear, from preserved specimens) are very difficult to extract (Brooks & Kind 2002). One female Lungfish spawning for the first time was 810 mm long, and one was 820 mm long (Brooks & Kind 2002). The species is considered long-lived, with estimates of life spans from 50 to 100 years (Arthington 2008)
Timing of spawning
The Australian Lungfish spawns at night between August and December, with peak activity in late October. In the Burnett River, spawning occurs between mid August and early November (Brooks & Kind 2002). In the Brisbane River and Enoggera Reservoir, eggs have been found between mid August and December (Kemp 1984). The breeding season in the Enoggera reservoir was usually shorter than that in the Mary, Burnett or Brisbane River (Kemp 1986). Lungfish delay or skip breeding if their spawning habitat is disrupted. Following severe winter flooding on the Brisbane River, spawning was reduced and delayed until October in one year, and there was no evidence of spawning after a second flood the next year (Kemp 1993). Spawning was also delayed when water hyacinth had not yet regrown after it died back during winter in the Enoggera Reservoir. Spawning is triggered by increasing daylength, and is not related to rainfall or water chemistry (Kemp 1984).
Conditions required for spawning
Lungfish pairs spawn amongst aquatic macrophytes. In the Brisbane river, eggs have also been recorded on submerged roots of Red Bottle-brush Callistemon saligna (Kemp 1984). Water depth, substrate, macrophyte species, macrophyte density and macrophyte height were all important in a model testing which sites were suitable for Lungfish spawning in the Burnett River (Brooks & Kind 2002).
Lungfish will spawn in both still and flowing water, but their spawning behaviour is different in the two environments. Brooks (1995) found that in areas of still water, egg densities were highest at water depths of 50 to 100 mm, and fewer eggs were found in deeper water. In still water, Lungfish prefer to spawn where the river bed is sandy, in water that is very shallow (less than 100mm deep). In flowing water, which contains more oxygen, Lungfish eggs may be found in depths of more than a metre. They usually use sites between 200 and 600 mm deep. In flowing water, they will spawn over a variety of river bed substrates. Lungfish spawned in shallow river sections between impoundments. No spawning was observed in Jones Weir or Ned Churchward Weir pools between 1997 and 2000, but fish in reproductive condition were caught once near an island in Ben Anderson Barrage Pool. Spawning Lungfish choose clear water and avoid turbid (muddy) water.
Lungfish eggs die before completing development at temperatures below 10° or above 30° C (Kemp 1981). A clutch consists of between 50 and 100 eggs (Kemp 1986). The eggs are around 3 mm in diameter, with an adhesive jelly coating around 1 cm wide. They sink when first laid (Kemp 1986). Lungfish thrash their tails at the end of spawning, apparently to disperse the eggs, which adhere to the surfaces of submerged macrophytes, and occur singly, in pairs, or very rarely in clumps (Brooks 1995). If suitable macrophyte species are not available, Lungfish will not spawn (Kemp 1984). Suitable macrophytes grow in a dense mass in shallow water in a variety of substrates from gravel to mud, and contain a complex community of algae, protozoa, worms, small molluscs and crustaceans (Brooks 1995; Kemp 1993). Suitable species include Vallisneria gigantea (the most commonly used), Hydrilla verticillata, Nitella sp., Potamageton perfoliatis, Milfoil Myriophylum sp., Najas tenuifolia, Water Couch Grass Paspalum distichum (a terrestrial grass that grows in a dense mat from the water's edge across the surface), Baby Tears Bacopa monniera, Curly Pondweed Potamageton crispus, Chara sp., Carex sp., Slender Knotweed Persicaria decipiens, Ludwigia peploides, Cladophera sp., various species of filamentous algae, and the introduced water hyacinth Eichhornia crassipes, which floats on the surface (Bancroft 1911, Brooks 1995; Grigg 1965a; Kemp 1993; Roughley 1951). In the Enoggera Reservoir, Lungfish clutches are laid in an area of one to five square metres on the roots and partly submerged floats of Water Hyacinth up to 1 m deep (Kemp 1984). Brooks & Kind (2002) also collected Lungfish eggs from partially submerged Para grass (Urochloa mutica) in the Brisbane River and the Mary River. Spawning always occurs in river sections where the cover of macrophyte algae is very high (usually exceeding 90%), and Lungfish choose the densest macrophytes available in which to lay their eggs. The highest densities of eggs were on macrophytes that were 160 mm tall, and fewer eggs occurred on taller water plants. Lungfish use macrophyte species with complex branching or leaf whorls rather than strap-like leaves, perhaps because eggs that detach from the surface of these are less likely to fall to the bottom (Brooks & Kind 2002).
In 1999 and 2000, Lungfish spawning was observed on the lower Boyne River, upper Burnett River at the junction with the Auburn River, at several riffle and glide sections between the Ned Churchward Weir wall and the Isis pumping station, and an area of Ben Anderson Barrage. Spawning on the Burnett River was recorded within a 7 km riffle and glide section of the river between Ned Chruchward Weir and the impoundment of Ben Anderson Barrage, where there was a steady flow of water, and abundant macrophytes. Spawning habitat on the lower Boyne River and the area 7 km downstream of Ned Churchward Weir was improved by releases of water from the weir and Boondooma Dam during 1999 and 2000. Large numbers of Lungfish congregated there during spawning, e.g. more than 500 individuals were counted within the 7 km on one day in October 2000. This area is the only remaining spawning habitat in the lower 80 km of the main channel of the Burnett River (Kind 2002). Lungfish also spawned above the influence of Ned Churchward Weir in the Goodnight Scrub area (which was then a flowing reach of the river between 80 and 200 km from the river mouth). Suitable macrophyte density for Lungfish spawning was rare in the Mary river between 1999 and 2002, as a result of a record high flow event that scoured the banks in 1999 (Brooks & Kind 2002).
Recruitment levels, and conditions required for successful reproduction
Lungfish eggs hatch after 30 days (Kemp 1981, 1986). Egg survival is best in shallow water that has a dense cover of macrophytes. Brooks & Kind (2002) found that the proportion of live Lungfish eggs increased with the density of macrophytes at the spawning site, up to a density of 40% (all macrophyte densities above 40% are equally suitable for egg survival). A lower proportion of live eggs occurred on taller macrophytes and in deeper water. The highest egg survival is between 200 and 800 mm water depth. Kemp (1986) reported that around 5% of eggs laid in the wild are unfertilised.
Young larvae look like tadpoles and are initially poor swimmers, resting on the bottom of the water on their sides until they have digested the yolk (Kemp 1995). Newly hatched Lungfish retreat from light (J. Joss, as cited in Brooks & Kind 2002). They first breathe air when they are 27 mm long and around 110 days old, and resemble adult fish when they are six or seven months old (Kemp 1981). They begin to feed four to six weeks after hatching (Kemp 1995), and reach 6 cm after eight months and 12 cm after two years (Allen 1989). Growth curves of wild Lungfish on the Burnett River show that they reach around 40 cm at five years of age (Brooks & Kind 2002).
Juvenile Lungfish smaller than 300 mm long have been collected from the Burnett and Mary Rivers, Enoggera Reservoir, and Mt Crosby Weir, 62 km downstream from Wivenhoe Dam in the Brisbane River (Longman 1928, as cited in Kind 2002; Johnson 2001; Kemp 1987; Semon 1899). One was found in the Boyne river (a tributary of the Burnett River) in 1892, and 20 in Enoggera Reservoir between 1928 and 1932. Six juvenile Lungfish were caught in the strainer of the water treatment works at Mt Crosby Weir in the Brisbane River in 1961, and eight in 1982 (Grigg 1965c; Kemp 1987). 'Numerous' juveniles were caught in the Burnett and Mary Rivers in 1981 and 1982. Brooks & Kind (2002) caught two juveniles at Traveston Crossing on the Mary River in 1998, and one at Twin Bridges in the Brisbane River in 1999. They also caught 23 juveniles in 1997 in the Burnett River. The size distribution of Lungfish between 1997 and 2001 indicated that recruitment of juvenile fish into this population was extremely poor, and there was a lack of fish under ten years old (fish up to 500 mm long were virtually absent from samples). This lack of successful recruitment was probably due to poor breeding conditions for several years (Brooks & Kind 2002). Three juveniles less than 200 mm long were caught in the upper reaches of Jones Weir in the Burnett River in 2004, and must have hatched in 2003 or 2004 (Brooks et al. 2005). Data on the frequency of different size classes of 2770 Lungfish in the Burnett River were collected by the Queensland Department of Primary Industries. They confirmed that recruitment for at least the five years prior to 2003 was lower than previously, and that there was a long period in the recent past where few juveniles survived. Kemp (1986) and Brooks & Kind (2002) suggested that Lungfish recruitment may be successful only in a small minority of years, when breeding conditions are good throughout much of the river (i.e. there are abundant macrophyte algae in shallow water, and high concentrations of microcrustaceans and invertebrates for juveniles to eat (Kemp 1977)). Kemp (1986) stated that successful breeding seems to have occurred at intervals of around twenty years since before 1900.
Juvenile lungfish are found only sporadically despite the fact that effective sampling techniques have been used at times when none were caught. For example, Bancroft (1911) failed to find any juveniles in the Burnett River despite exhaustive liming, dynamiting and dredging of spawning habitat (Kemp 1986). None were caught in the Mt Crosby water treatment works filters between 1961 and 1982, and none were caught in Enoggera Reservoir by electrofishing in the early 1980s (Kemp 1986). Brooks & Kind (2002) failed to find juvenile Lungfish in the Burnett River between 1998 and 2001, despite intensive and widespread sampling of spawning habitat using frame nets and electrofishing, which were previously effective.
There is no recent evidence of successful Lungfish breeding in impoundments outside the Burnett River, Mary River, and the Brisbane River downstream of Wivenhoe Dam. All records of Lungfish in Lake Samsonvale and Lake Wivenhoe are of mature adults. There has been no evidence of spawning or recruitment in Enoggera reservoir since the control of Water Hyacinth began there in 1974 (Kemp 1987; Illidge 1893, as cited in Kind 2002). Water Hyacinth forms a floating mat, so it can provide complex habitat for Lungfish eggs and juveniles close to the surface, even in deep water bodies with steep banks that are unsuitable for other macrophytes. Water hyacinth is also used as a substrate for successful captive breeding (Joss & Joss 1995). However, it is not recommended for management of breeding habitat because it is a declared pest plant (Sinclair Knight Mertz 2001). In some years Water Hyacinth dies back during the winter (Kemp 1984), so it would not be available as juvenile habitat in those years. When Lungfish bred in the Enoggera Reservoir, it may have provided better spawning habitat than do impoundments on the Burnett River, because it supplies drinking water, so the water level changes slowly compared with the rapid changes in flow associated with irrigation supplies for sugar cane and other seasonal agriculture on the Burnett River (Brooks & Kind 2002).
Due to the variation in spawning conditions and food resources, successful recruitment of lungfish is not likely to occur every year. This can affect age classes in populations, with a result that seemingly secure populations may decline catastrophically once older individuals die, and with lower or no replacement breeding stock (Walker 2008).
Adult Lungfish are benthic omnivores (eating both animal and plant matter on the bottom of the river). They eat frogs, tadpoles, fishes, shrimps, prawns, earthworms, aquatic snails, bivalve molluscs (pelecypods) such as mussels, moss, fallen flowers from Eucalyptus trees and aquatic plants. Some of the plant material eaten is probably ingested incidentally while foraging for small crustaceans and molluscs, and is not digested. Young Lungfish feed on a variety of soft-bodied small prey including insect larvae and crustaceans (Allen 1989a; Illidge 1884, as cited in Kind 2002; Joss & Joss 1995; Kemp 1986).
Lungfish forage mainly at night. In the Mary River, adults forage predominantly where there are macrophyte beds in shallow water (less than 2 m deep). Juveniles ambush their prey in the structurally complex habitat of aquatic plants, catching and holding them with sharp, cone-shaped teeth (Kind 2002). Lungfish detect the vibrations of prey, and are capable of perceiving the weak electric fields generated by animals. Experiments have shown that they can accurately locate buried prey using electroreception (Watt et al. 1999).
In rivers with natural flows of water, the Australian Lungfish is largely sedentary. In flowing (unimpounded) sections of the Burnett River and the Mary River, adults usually move around one or two pools at night and return each day to a certain habitat feature such as a submerged log, rock or patch of macrophytes in one particular pool, where they rest. Individuals are routinely found resting in the same daytime retreat over many consecutive months. Movements exceeding one kilometre are rare, and only four of the 20 Lungfish radio-tracked were ever found more than 5 km from their original site (Kind 2002). Berghuis & Broadfoot (2004a) captured 42 of the same individuals that were originally tagged by Brooks & Kind (2002), and most were still in the same areas as they had been five years previously.
In 2002, Lungfish movements in the (then) flowing section of the Burnett River (the Goodnight Scrub) were independent of temperature and water flow (Brooks & Kind). During a record flood on the Mary River, Lungfish remained in their home ranges and retreated to the shallow banks. After the river broke its banks, several left the channel to shelter amongst flooded vegetation, on the downstream side of large trees, or in a deep vehicle track perpendicular to the flow direction (Kind 2002). Despite their large size, they are capable of traversing very shallow riffle zones (e.g. 120 mm deep) into other pools to find food and spawning habitat (Kind 2002; Brooks & Kind 2002). Immature Lungfish (n = 3) moved up to 200 m from their daytime retreats while foraging at night, but remained close to cover (Kind 2002).
The movements of Lungfish are restricted by natural and man-made barriers. Natural barriers include waterfalls and gorges (e.g. on the Auburn River and Barambah Creek, which are tributaries of the Burnett River), and ephemeral (temporary) water (e.g. the Nogo and Perry Rivers, tributaries of the Burnett River which are devoid of Lungfish). Man-made barriers include dams, weirs, barrages and culverts. For example, Lungfish apparently inhabited the Boyne River above the Boondooma Dam before the dam was constructed. They no longer occur there, although they are abundant downstream of the dam to the junction of the Burnett River. Claude Wharton Weir at Gayndah and Jones Weir at Mundubbera block the passage of Lungfish, and the culverts at Booyal Crossing apparently also form barriers to Lungfish movements, except during particularly high flows (Brooks & Kind 2002).
In the Burnett river, Lungfish in established impoundments moved much more than those in flowing sections, and Lungfish movements became much more variable at reproductive maturity. Adult Lungfish radio-tagged downstream of the Ned Churchward Weir (in the established Ben Anderson Barrage pond and the shallow zone upstream of this) moved regularly between the weir and the barrage. For example, one individual traversed the 48 km from the weir to the barrage at least four times between 1998 and 2001. There is an annual cycle of movement to and from spawning grounds in this section of the Burnett River, when fish abandon their usual home ranges. Lungfish spawned in the series of shallow riffles and runs immediately below Ned Churchward Weir wall. Some individual females moved upstream to spawn here, then returned to their usual home ranges in the impoundment more than once in a season (Kind 2002). Increases in water discharge from the weir caused Lungfish to move downstream, and downstream movements were significantly related to the river flow rate. These fish were probably not passively washed down the river, but took advantage of the flow to return more easily to their non-breeding season home ranges. Two Lungfish that had been tagged upstream of the weir apparently swam over the top of the wall during flooding in February 2003, and moved 25 and 36 km downstream. They were detected by Berghuis & Broadfoot (2004a) attempting to return upstream in April and May the same year, but they did not successfully pass through the fishlock. Some Lungfish tagged in the Jones Weir moved upstream during the spawning season into shallow sections of the Boyne and Auburn Rivers, which are tributaries of the Burnett River (Brooks & Kind 2002). During the non-spawning season, fish in established impoundments showed strong site fidelity in a restricted area, similar to fish in flowing parts of the river. Lungfish in the Mary River (which contained no substantial impoundments) did not undertake spawning migrations (Kind 2002).
Lungfish that were caught and radio-tagged within the Ned Churchward Weir in the Burnett River made only local movements, similar to fish in the unimpounded section of the river. When the weir was filled, they moved into the flooded areas. Several fish then became stranded in a pool when the water level subsequently dropped, and had to be moved overland to the river before the pool dried. With the exception of one individual that moved out of the impoundment and travelled 11 km upstream, they did not move away from the inundated area to find a spawning site. During the spawning season, large groups of Lungfish were seen milling around the water surface over previous spawning sites that were now flooded by the weir. Brooks & Kind (2002) suggested that searching for spawning habitat further afield is a behaviour learned by Lungfish in established impoundments over time.
The mean linear range of Lungfish in the Burnett River was 11714 ± 16044 m (n = 29 fish). There was no difference between the sexes. Lungfish in the lower reaches of the river (in the Ben Anderson Barrage pond) downstream of Ned Churchward Weir had larger home ranges and their ranges were proportional to body length, unlike those within the impoundment and in flowing sections of the river (Brooks and Kind 2002). The mean linear range of Lungfish in the Mary river was 4770 m (standard deviation 8400 m, n=20 fish), including two individual males with ranges of 26.1 km and 30.5 km. The average linear range of Lungfish in the flowing section of the Burnett River was 1758 m. Some individuals in flowing river habitat had linear ranges of 300 to 500 m. The linear ranges of Lungfish in the Mary River and the Goodnight Scrub (then flowing) area of the Burnett River were not significantly different, but those in the impounded sections of the Burnett River were larger.
In adults, home ranges of both sexes overlap, and daily ranges are smaller in winter. Three immature fish had linear ranges of 900 to 2400 m. Unlike adults, juvenile Lungfish appear to be territorial, and aggressive to one another. During the day, larger juveniles in captivity pushed and bit smaller ones to exclude them from preferred shelter sites (Kind 2002).
Adult Lungfish are largely nocturnal. They forage in the early morning, late afternoon, and night, and their activity peak during foraging is around midnight. They are inactive between 10am and 3pm. They forage for shorter periods during winter than in summer. It is sometimes possible to observe them (e.g. during spawning), and to hear the gurgling sound of air rushing into the lung as they surface to breathe (Grigg 1975; Kind 2002), but systematic surveys to confirm their presence or absence at a site involve capturing fish (Brooks & Kind 2002; Kind 2002).
Lungfish eggs are distinctive and can be surveyed using systematic searches of macrophytes in shallow water (Kind 2002). Juvenile Lungfish are difficult to detect between the period just after hatching, and when they reach 300 mm long, because they have a cryptic appearance and behaviour, remaining in dense cover and shade when young. They have been found amongst the roots of water hyacinth plants (Kemp 1984), amongst other macrophytes suitable for Lungfish spawning (Brooks & Kind 2002; Kind 2002), and in water treatment works (McDougall 2001, as cited in Johnson 2001).
The Burnett River basin is one of the most developed river catchments in Queensland. It contains 26 water storages, including seven on the main channel of the Burnett River. In 2002, the Mary River system contained 11 water storages, and most barriers to fish movement were on tributaries of the river. Water infrastructure on the Mary River itself is limited to the Gympie Control Weir, a small weir 179.5 km from the river mouth that is regularly inundated by flows, and the Mary River tidal barrage at Tiaro, 59 km upstream from the river mouth (Berghuis & Broadfoot 2004a; Kind 2002). Dams can change the water quality downstream, because they often release poorly oxygenated water, increase sediment and cause bank erosion through flow regime changes (especially in the first five years after construction) (Walker 1985).
Dams and weirs provide habitat for adult Lungfish. Brooks & Kind (2002) found that adults in impoundments and riverine (non-impounded) areas were in equally good body condition. However, Kind et al. (2005) found that Lungfish below the wall at Claude Wharton Weir in 2004 were in poorer condition (they were lighter for their length) than those in other parts of the Burnett River. There was no spawning below this weir or below Jones Weir in 2004. They suggested that overcrowding might be the cause of poor body condition, as large numbers of Lungfish had congregated below the weir, which has no fishway.
Flooding as a result of dams and weirs removes the breeding habitat of Lungfish (shallow water containing dense macrophytes), and dam walls block the movement of adult lungfish to the remaining breeding sites (Brooks & Kind 2002; Environment Australia 2003ab). The shallow, heavily vegetated areas required as spawning habitat are patchy, so Lungfish need to move between different parts of the river if their usual home range lacks adequate spawning habitat in a given year (Brooks & Kind 2002). The cumulative effect of multiple weirs and dams progressively removes Lungfish breeding habitat and disrupts movements. The closer impoundments are placed together, the more severe this effect is (Boardman 1996a; Brooks 2002; Brooks & Kind 2002). In 2002, 41% of the known range of the Lungfish within the main channel of the Burnett River (128km) had been inundated by impoundments (Brooks & Kind 2002). When the Burnett River (Paradise) dam has filled, this will increase to 55% (173 km). In 2003, it was estimated that there was a 26 per cent loss or reduction in the amount of breeding and nursery habitat for the Lungfish overall (Environment Australia 2003ab). This has now increased, as a further 14 of the remaining 35 riffle sections of the lower Burnett River were impounded by the Burnett River dam, so that now only 26 km of the formerly flowing reach in the Goodnight Scrub remains (Sinclair Knight Mertz 2001). As a result of breeding habitat reductions, the population is likely to undergo a substantial decline within the next three generations (Environment Australia 2003ab).
Impoundments are likely to have negative effects on eggs and juvenile Lungfish, because macrophyte beds of the density required rarely have time to establish, there is a risk of stranding, and the diversity of macroinvertebrates (eaten by juvenile Lungfish) is lower than in the unimpounded river (AWT 2001; Brooks & Kind 2002). Brooks & Kind (2002) reported that the extensive macrophyte beds that Lungfish used for breeding disappeared after Walla Weir on the Burnett River (now called Ned Churchward Weir) flooded the area. Flooding washed away macrophyte beds, and turbid (muddy) flows smothered recovering macrophytes. Construction of impoundments results in initial loss of spawning habitat as shallow areas upstream are inundated. For example, when Walla Weir was created, macrophytes died and decomposed within six weeks. After the water level upstream became constant, new growth of water plants established after a further six to nine weeks, but these plants died when the water level fluctuated again (Duivenvoorden 1998). Macrophytes that have been scoured or destroyed by flooding may take years to re-establish and grow into dense beds. Brooks & Kind (2002) found that extensive macrophyte beds in the Burnett River that were used by Lungfish during the 1995 breeding season and were then destroyed by high flows, had not fully re-established by the 2000 breeding season. At Walla Weir, spawning habitat was also exposed and adult Lungfish were stranded by changes in water level below the weir (Berghuis et al. 2000). Brooks (1995) recorded Lungfish spawning within the Ben Anderson Barrage on the Burnett River in 1995 when water levels were very low throughout the catchment, but eggs were killed by subsequent changes in water level. Juveniles rely on dense macrophyte beds in very shallow water for many months or years after hatching, so they are vulnerable to stranding, loss of shelter and loss of food from fluctuations in water level. Brooks & Kind (2002) and Kind (2002) noted that spawning habitat on the lower Boyne River and the area 7 km downstream of Ned Churchward Weir on the Burnett River was improved by releases of water from Boondooma Dam and Walla Weir during 1999 and 2000. However, they doubted that impoundments can be operated to provide long term habitat for recruitment of Lungfish.
Although Lungfish sometimes form spawning aggregations in unregulated sections of the Burnett River (Johnson 2001), Brooks & Kind (2002) considered that as the amount of suitable spawning habitat decreases and Lungfish in impoundments are unable to move to spawning sites outside, crowding effects are likely to increase beyond natural levels. These might include increased predation of eggs and juveniles, increased competition between adults for spawning sites, and between juveniles for habitat and food, and mortality from disease. Hatchlings and eggs are vulnerable to bacterial infections, both in the wild and when raised in captivity (Kemp 1994).
Lungfish can be injured or killed when they pass over the top of dam walls during high water flows. They swim over the top of Ben Anderson Barrage at high tide, and into the estuary. If not rescued, these fish are stranded and will be killed by the salt water or by sharks, because they are too large to use the vertical slot fishway in the barrage (Berghuis et al. 2000; Brooks & Kind 2002; Kind 2002; Stuart & Berghuis 2002). Stuart & Berghuis (2002) collected 44 lungfish from the bottom of the barrage between December 1997 and April 1999. A similar process occurs at Mary River tidal Barrage (Berghuis 2001) and Kemp (1995) also reported that Lungfish were stranded in unsuitable habitat when they descended over the Enoggera Reservoir wall. Johnson (2001) reported that around 60 individuals were found dead or injured at the base of the spillway of Lake Samsonvale dam wall after a rapid release of water there. He suggested that many Lungfish are likely to be injured or killed passing over the dam and weir walls in the Burnett River during severe floods, and very large floods could potentially kill hundreds of individuals. Berghuis & Broadfoot (2004b) also emphasized that most passage of fish downstream at Ned Churchward weir on the Burnett River happens over the spillway during high flows. Large fish such as Lungfish are most likely to be injured or killed by abrasion and shearing against the spillway face as they are washed over the wall. Some fish also pass over the wall during low flows. Conditions during low flows are particularly dangerous because water and fish drop vertically before hitting the slope of the spillway face.
- Recruitment in Lungfish is naturally erratic. In the early 1990s, a substantial proportion of the Lungfish in the Burnett River were small (200 to 600 mm long, Brooks 1995; Brooks & Kind 2002). There was spawning, but no detectable recruitment of Lungfish between 1995 and 1999. Juveniles were found in the Burnett River in 1997, but these were lost during a high flow event that scoured their macrophyte habitat from the river, and no further juveniles were found by Brooks & Kind (2002) until 1999, despite intense sampling using the same methods. During the many months that juvenile lungfish remain in beds of macrophytes after hatching, they are vulnerable to displacement and predation during flow events. The distribution of size classes of fish in the Burnett River indicates that there have also been periods of several years without recruitment in the past. Reducing the amount of suitable spawning habitat is likely to increase the number of years in which recruitment fails due to natural events such as droughts and floods. Because adult Lungfish are very long-lived, population decline due to increasingly frequent recruitment failure will not be detectable for several decades (TSSC 2003). As the species shows strong affiliation to spawning sites, there is also the threat of low recruitment from impacts on known spawning sites (Catalyst 2006).
- Lungfish are caught by recreational anglers targeting other fish (Kemp 1995; Kind 2002). Of 52 radio-tagged fish studied by Kind (2002) in the Burnett and Mary Rivers, four may have been caught by anglers. The aerial of one transmitter had apparently been cut by a tool, but the fish was released and continued to live in the river. One transmitter that had been implanted in a fish was recovered away from the water, and two were recovered next to campgrounds. Johnson (2001) noted that Lungfish are often caught accidentally by anglers in the North Pine River.
- Exotic or translocated native fishes, such as the exotic Tilapia, are believed to prey on lungfish eggs and young and compete with adults for breeding habitat (Environment Australia 2003).
- Widespread clearing of riverbank vegetation has reduced habitat for Lungfish, because they often shelter or spawn amongst parts of terrestrial plants that overhang the water, particularly in the Mary River. Clearing also increases the damage caused by floods and removes cover that Lungfish use to prevent themselves from being displaced by fast-flowing floodwater (Johnson 1997, as cited in Kind 2002; Kind 2002).
- It has been suggested that the number of water snails, clams, filamentous algae and macrophytes have declined in the Brisbane River in recent years, due to the flushing effects of water releases, and that cyanobacteria now dominate the microflora because of high nutrient levels from fertiliser runoff (TAPSF n.d.). These changes have reduced food and breeding habitat for Lungfish. Runoff from cotton cultivation, citrus crops and cane production is also a potential problem in the Burnett River (Tucker et al. 1999). Water quality in the Mary River in the vicinity of Gympie is affected by discharge from a sewerage treatment plant, which increases nutrients and decreases oxygen in the water. Meatworks effluent, pesticide and herbicide runoff also affect the river bank and water quality in sections of the Mary River (EPA 2001).
Lungfish in the Burnett River, the Mary River and the Brisbane River have low genetic diversity, probably because of past population bottlenecks combined with the long generation time and low juvenile survival. This could exacerbate the effects of other threats, so it is important not to hinder gene flow between impoundments (Frentiu et al. 2001).
An evolutionary biologist has suggested that `floating islands' of thick weed mats at the correct water depth could be used to provide artificial breeding habitat for Lungfish in impoundments. The weed mats could be placed at previously inhabited sites. It has been hypothesised that when the lungfish return to a previous spawning site, they will find these weed mats and will make use of them (Catalyst 2006).
A research project is testing artificial environments for eggs and young lungfish in the Brisbane River. Long strands of acrylic wool tied in bundles and attached to Callistemon roots or floating platforms are rapidly colonised with protozoa and small clams (potential food for juvenile Lungfish). Despite low levels of spawning recently in the Brisbane River, these 'mops' were used by spawning Lungfish, and healthy eggs were recovered from them (TAPSF n.d.).
Johnson (2001) recommended that in order to reduce harm from existing impoundments:
- Water releases from weirs and dams should be gradual and carefully timed, and macrophyte abundance monitored.
- Passage opportunities should be constructed at causeways, bridges, and other crossings.
- At Ben Anderson Barrage, the vertical slot fishway might be improved by replacing the current 1: 15.8 gradient with a more gradual slope, such as 1: 18 to 20, and increasing the slot width. Until an appropriate fishway exists, staff should check for Lungfish in the estuary after major flows and manually relocate them above the barrage. The departure angle of the wall could be adjusted and energy-dissipating measures put in place at the base of the wall to minimise Lungfish injury during spillover at the barrage.
- Some Lungfish found spawning in very crowded sections of the Burnett River could be translocated to suitable habitat that is currently blocked by impoundments, such as Boondooma dam and Bjelke Petersen dam.
Devices to move fish upstream of dam walls and weirs (fishways)
The design of fishways depends on the height of the wall. Vertical-slot fishways are used for medium-sized weirs up to 6 m high. They consist of a concrete channel extending from the top of the weir (headwater) to the base of the weir (tailwater). Concrete walls or baffles are then inserted along the length of the channel to slow the flow of water. Vertical-slot fishways usually have a low slope (1:20 gradient) with slow water velocities (1 metre per second) and low turbulence (Larinier et al. 2002; QDPI 2004). The Vertical-slot fishway at Ben Anderson Barrage has a 1: 15.8 gradient and the slots are 150 mm wide, which is too narrow for adult Lungfish to swim up (Stuart & Berghuis 2002). However, adult Lungfish up to around 800 mm long have been observed moving through a 200 mm wide vertical slot fishway at the Tinana Creek Barrage (on a tributary of the Mary River) (Berghuis 2001).
Fishlocks are computerised devices to transfer fish over dam walls which are usually 8 to 10 m tall. The fishlock consists of a downstream channel at the tailwater (base of the weir) connected to a vertical chamber which extends to the top of the weir. There is an exit chamber at the top of the vertical chamber. Fish attempting to find a route upstream search for areas of high flow. Water is discharged from the fishlock to attract fish into the downstream channel and then into a cage at the bottom of the vertical chamber. The gate shuts behind them, the vertical chamber is filled with water, and the cage floats to the top, where another attraction flow entices fish to swim into the exit chamber (Larinier et al. 2002; QDPI 2004).
Lungfish use fishlocks infrequently. There is a 15 m high fishlock on Ned Churchward Weir in the Burnett River, and Berghuis et al. (2000) recorded that 12 lungfish used this. However, Brooks & Kind (2002) observed that radio-tagged Lungfish at the same weir approached but did not enter the fishlock, and large numbers of Lungfish gathered downstream prior to spawning seasons, but did not pass through. Berghuis & Broadfoot (2004a) used remote monitoring of Lungfish that had passive transponder tags to determine if they entered this fishlock. In 2003, they tagged 1285 Lungfish upstream and downstream of the weir. 41 Lungfish were detected approaching the fishlock in the downstream channel, and seven used the fishlock. These fish were 385 to 1170 mm long. Most Lungfish approaching downstream swam in and out of the channel several times before leaving the area. There was no difference in the size range of Lungfish in the downstream channel and the size range tagged in the River generally. More Lungfish congregated at the downstream channel (attempting to swim upstream from the direction of Ben Anderson Barrage) than the upstream one.
Berghuis& Broadfoot (2004a) suggested several reasons why so few Lungfish used the fishlock. Fish attempting to find a route upstream could previously swim anywhere across the width of the river. At a natural barrier, fish moving upstream were able to scan the constantly-flowing open water below the barrier to find the best place to pass. They are now expected to cross a turbulent channel that may be several hundred metres wide in high flows, in order to find a single fishlock entrance. The pattern of flow beneath the spillway and the fishlock entrance differ because the two are separated by a wall. The attraction flows at the fishlock are discontinuous, and insignificant compared to the rate of water flowing over the spillway during high flows, when large numbers of Lungfish congregate, probably attracted away from the fishlock by the higher water flow over the spillway. Additionally, fish entering the fishlock must wait in the chamber for up to 40 minutes before the gate closes behind them, and must exit at the top before the chamber empties. Several Lungfish entered the chamber at the bottom but then left again before the gate closed. Some fish took 17 minutes to pass through the fishlock, but one took more than five hours, and one took two days to leave. A potential problem for small individuals using fishlocks is that large, predatory fish sometimes exploit them as shelter in which to ambush prey (Berghuis & Broadfoot 2004b).
Berghuis & Broadfoot (2004a, 2004b) suggested the following improvements to the design of Ned Churchward Weir fishlock, and other fishways, to enable Lungfish passage:
- Water flows to attract Lungfish to the downstream fishlock entrance should be increased and varied to compete with the changing spillway flow. The time that water flows to attract Lungfish to the upstream entrance should be increased, as there is no attraction flow for 68% of each cycle. Constant attraction flows upstream and downstream could be accomplished by drawing water from the upstream fishlock channel, together with the present system of using surface water from the variable offtake outlet works at the base of the wall.
- A better entrance design.
- Mechanical restraint of fish in the chamber without preventing downstream movement. This restraining device could be removed during the appropriate part of each cycle to allow fish to leave.
- Mechanical devices to encourage fish to leave at the top of the fishlock.
- Management of overcrowding (e.g. multiple fishlocks), as Lungfish and other species migrate upstream and downstream at the same times of year.
- Extending the times that the fishlock operates by starting it as soon as possible after a peak flood flow has passed. It currently shuts down during floods to avoid damage.
- Because Lungfish need to be able to move safely both upstream and downstream, but the fishlock is designed for upstream passage, a dedicated downstream fishway should be considered. For example, a notch in the wall with a deep stilling basin below it to dissipate energy as fish pass over the weir, or a low gradient bypass that regulates flow velocity downstream.
At 37 m, the wall of the Burnett River (Paradise) dam is too high for conventional fishways. A computerised mechanical fish lift has been installed immediately downstream of the dam. Fish are attracted into a large bucket by engineered water flows, and every twenty minutes the water and fish are lifted out of the river, up and over the dam wall (ABC, Wide Bay-Burnett 2006).
Monitoring in the vicinity of Burnett River Dam
Six Lungfish sampling sites have been established between 119 and 201 km from the mouth of the Burnett River, in order to monitor the effect of the newly-constructed Burnett Dam. These are at Figtree, Cherelly Orchard, Kalliwa Hut, Mingo Gorge, Gray's Waterhole, and Claude Wharton Weir. The sites at Kalliwa Hut and Mingo Gorge are within the impoundment. Seven spawning survey sites have also been established. These are at Fig Tree, River Road Crossing, Kalliwa campground, Mingo crossing, Yenda Benyenda, downstream of Gayndah and in the Gayndah township. Kalliwa campground, Mingo crossing, and Yenda Benyenda are within the impoundment. Kind et al. (2005) collected baseline information on water quality, habitat, condition and size of Lungfish and the distribution of Lungfish eggs in August 2004 and January 2005, as part of a ten-year monitoring program. Lungfish were often found in the area of the Burnett River Dam, and occurred at similar density to areas downstream. There was no spawning at the two Gayndah sites.
The following table lists known and perceived threats to this species. Threats are based on the International Union for Conservation of Nature and Natural Resources (IUCN) threat classification version 1.1.
|Threat Class||Threatening Species||References|
|Agriculture and Aquaculture:Agriculture and Aquaculture:Land clearing, habitat fragmentation and/or habitat degradation||Neoceratodus forsteri in Species Profile and Threats (SPRAT) database (Department of the Environment and Heritage (DEH), 2006pk) [Internet].|
|Biological Resource Use:Fishing and Harvesting Aquatic Resources:Mortality due to capture, entanglement/drowning in nets and fishing lines||Neoceratodus forsteri in Species Profile and Threats (SPRAT) database (Department of the Environment and Heritage (DEH), 2006pk) [Internet].|
|Ecosystem/Community Stresses:Indirect Ecosystem Effects:Restricted geographical distribution (area of occupancy and extent of occurrence)||Commonwealth Listing Advice on Neoceratodus forsteri (Australian Lungfish) (Threatened Species Scientific Committee, 2003j) [Listing Advice].|
|Invasive and Other Problematic Species and Genes:Invasive Non-Native/Alien Species:Competition, predation and/or habitat degradation by fish||Neoceratodus forsteri in Species Profile and Threats (SPRAT) database (Department of the Environment and Heritage (DEH), 2006pk) [Internet].|
|Invasive and Other Problematic Species and Genes:Problematic Native Species:Competition, predation and/or habitat degradation by fish|
|Natural System Modifications:Dams and Water Management/Use:Alteration of hydrological regimes and water quality|
|Natural System Modifications:Dams and Water Management/Use:Changes to hydrology including construction of dams/barriers|
|Pollution:Agricultural Effluents:Environmental impacts due to application of fertilisers, herbicides and pesticides|
|Species Stresses:Indirect Species Effects:Low genetic diversity and genetic inbreeding|
|Species Stresses:Indirect Species Effects:Low numbers of individuals||Commonwealth Listing Advice on Neoceratodus forsteri (Australian Lungfish) (Threatened Species Scientific Committee, 2003j) [Listing Advice].|
|Species Stresses:Indirect Species Effects:Poor recruitment (regeneration) and declining population numbers|
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AWT (2001). Final Report: Environmental monitoring for the operation of Walla Weir. Report prepared for Sunwater by Australian Water Technologies.
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Berghuis, A.P. & C.D. Broadfoot (2004a). Upstream passage of Queensland lungfish at Ned Churchward Weir Fishlock. Queensland Government Department of Primary Industries, Queensland Fisheries Service, Bundaberg. Report for the Department of State Development, March 2004.
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Duivenvoorden, L.J. (1998). Aquatic Flora of the Burnett River in relation to the Walla Weir- Post Construction Phase:. Page(s) 1998. Report for Queensland Department of Natural Resources, Resource Development and Planning: Brisbane.
Environment Australia (2003ab). Information Sheet - Australian Lungfish (Neoceratodus forsteri). [Online]. Available from: http://www.environment.gov.au/biodiversity/threatened/publications/lungfish.html.
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Grigg, G.C. (1975). The lungfish- creature from the past. Koolewong. 4 (2):11-13.
Illidge, T. (1884). On Ceratodus forsteri. Proceedings of the Royal Society of Queensland. 10:40-44.
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Citation: Department of the Environment (2013). Neoceratodus forsteri in Species Profile and Threats Database, Department of the Environment, Canberra. Available from: http://www.environment.gov.au/sprat. Accessed Wed, 11 Dec 2013 22:29:22 +1100.