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Salamanderfish (Lepidogalaxias salamandroides)

The Salamanderfish is a small, endemic freshwater fish restricted to seasonal, acidic pools, wetlands and shallow drainage features in south-western Western Australia. It survives drying by aestivating in mud burrows, so clearing, drainage, altered groundwater and damage to peat-flat wetlands can affect both active fish and buried individuals.

Conservation status

Western Australia, Biodiversity Conservation Act 2016: Endangered.

Breeding season

The timing below describes a typical seasonal cycle for south-western Western Australia. Rainfall and wetland filling can shift the timing between sites and years.

Months are January to December. The calendar is a field-planning guide, not a substitute for site-specific survey and hydrological assessment.

  • Breeding and egg laying: Breeding follows heavy autumn and winter rain, generally from late May to August, with peak activity described during winter.
  • Young fish and rapid growth: Young fish develop in inundated pools and can reach about 2.5 cm by summer. The supplied documents do not give exact hatching or dependence dates.
  • Refilling and return to surface water: Fish return when seasonal depressions fill after autumn or winter rain. The timing varies with rainfall and local wetland hydrology.
  • Aestivation in mud burrows: Fish aestivate as pools dry, commonly through the dry summer period. Some habitats may remain dry for at least 6 months.
  • Highest clearing risk: Risk is highest during late May to August when breeding and young fish may be present in shallow pools, and during late spring and summer when fish may be buried in aestivation burrows. Dry wetland beds should not be assumed to be unoccupied.

Identification

The Salamanderfish is a small, elongate fish of dark, tannin-stained seasonal waters. It is unusual in having fixed eyes and a highly flexible neck.

The body is cylindrical and elongate. It is greenish-brown above, pale below, and marked with dark blotches and silver speckles on the sides. The eyes are reddish and cannot move in their sockets because skin covers the surface of the head and the fish lacks external eye muscles.

The fish compensates for its fixed eyes by bending its neck, allowing the head to move independently of the body. It has a wedge-shaped skull and a flexible vertebral column, features associated with burrowing.

Maximum reported size: About 8 cm total length for females

Male size: Males are smaller and rarely exceed 5 cm

Weight: Not reported in the supplied documents

Identification: Similar species

The Salamanderfish is the only species in the family Lepidogalaxiidae and is readily separated from other fish by its small size, reddish fixed eyes, elongate cylindrical body and occurrence in very shallow, darkly stained acidic pools.

The Black-striped Minnow can also aestivate in south-western seasonal wetlands, but it is a different species. The supplied documents do not provide a full field key for separating live individuals, so photographs or retained specimens should be referred to an experienced freshwater fish specialist where identification is uncertain.

Identification: Field signs

Active fish may be found in shallow, tea-coloured pools, drains, ditches and floodwater after autumn or winter rain. The dark water and low visibility mean that absence from a visual inspection is not reliable evidence of absence.

When wetlands dry, the species burrows into the peat or mud and aestivates. Burrows are described as pear-shaped, connected to the surface by a thin tube, and occupied in a U-shaped posture. Fish may be enclosed in a mucus sheath.

  • Record the location, dimensions and water condition of every suitable pool, ditch or wetland feature.
  • Treat apparently dry peat or mud around former pools as potential habitat during the dry season.
  • Do not rely on tracks, scats, calls, nests or eyeshine, as these are not field signs of this species.

Distribution: National range

The Salamanderfish is endemic to a restricted part of south-western Western Australia. No other Australian state is included in the supplied distribution information.

The species occurs only in Western Australia, in seasonal pools and wetlands between the Blackwood and Kent rivers. Other descriptions place the range between the Albany District and the Scott River.

The range is within the temperate south-west of Western Australia and includes peat-flat wetlands, shallow pools and associated ephemeral drainage features. A precise elevation range is not provided.

States: Western Australia only

Broad range: Between the Blackwood and Kent rivers, including the Albany District to the Scott River area

Bioregion: South-western Western Australia. A more specific Interim Biogeographic Regionalisation for Australia region is not given in the supplied documents.

Distribution: Strongholds and trend

Recorded habitat includes the ephemeral wetlands of D'Entrecasteaux National Park and floodwater east of Lake Smith. Lakes Smith, Wilson and Jasper are identified in the supplied material in connection with Salamanderfish habitat and records.

The species has undergone a severe range contraction. Persistence is associated with deeper wetlands and shorter drying periods, while persistence declines as the drying period becomes longer.

Extent of occurrence change: 79% reduction over the past 40 years

Area of occupancy change: 70% reduction over the past 40 years

Population size: A total population estimate is not provided

Information condition: Condition was assessed as poor, about 25%, in the supplied case study

Habitat: Wetland types

Salamanderfish habitat consists of shallow, temporary freshwater systems in peat-flat country. Sites are generally acidic, darkly tannin stained and influenced by seasonal rainfall.

The species occurs in ephemeral pools, shallow streams, drains, ditches, wetlands and floodwaters. Suitable sites may be small peat-flat depressions or larger pools associated with relatively intact southern forest wetlands.

Water is generally dark or tea-coloured because of tannins and has low pH. Fishbase reports a typical water temperature range of 17 to 26 degrees Celsius and a pH range of 3.8 to 4.5, while the Australian Museum gives a broader pH range of 3.0 to 6.5.

Water regime: Seasonal and temporary, with some habitats dry for at least 6 months

Typical pH: About 3.8 to 4.5 in the Fishbase summary

Reported temperature range: 17 to 26 degrees Celsius

Elevation: Not reported

Habitat: Habitat structure

Key features are shallow water, peaty or sandy peat substrates, dark organic-rich water, seasonal inundation and nearby mud that can support aestivation burrows. Local persistence is positively associated with wetland depth.

The species depends on surface water and groundwater conditions that allow pools to refill and remain wet for long enough to support feeding, growth and breeding. Winter rainfall is an important influence on pool hydrology.

  • Retain the full wetland depression, peat margin and adjacent drainage pathways during site planning.
  • Prevent sediment, soil, chemicals and altered runoff from entering seasonal pools and ditches.
  • Maintain the natural timing, depth and duration of inundation wherever practicable.

Foraging habitat: Diet and feeding sites

Salamanderfish feed in shallow seasonal waters while the pools are inundated. Their diet is based on small aquatic prey rather than terrestrial vegetation.

The documented diet consists mainly of aquatic insect larvae and small crustaceans. Another account describes aquatic crustaceans as the main food.

Feeding habitat includes shallow pools, drains, ditches and floodwaters with an organic-rich substrate. The species can move its head independently of its body while searching for food, which may help it feed in confined shallow habitat.

Main prey: Aquatic insect larvae and small crustaceans

Foraging range: Not reported. The species is described from shallow local pools, drains, ditches and floodwaters.

  • Protect inundated pools and their shallow margins, not only the deepest open water.
  • Retain organic substrates and water quality that support aquatic insect larvae and small crustaceans.
  • Avoid treating a dry pool as having no foraging value, as it may be occupied by aestivating fish before refilling.

Breeding habitat: Breeding requirements

Breeding starts soon after autumn or winter rainfall inundates previously dry habitat. The species uses shallow parts of temporary pools and associated floodwaters for spawning.

Suitable breeding habitat includes shallow inundated peat-flat pools, ditches, floodwaters and other temporary wetlands that refill after rain. Breeding is associated with heavy rain and occurs before the habitat dries again.

Males use a modified anal fin to transfer sperm, allowing internal fertilisation. Females deposit the eggs in shallow water. The supplied documents do not specify a nest, vegetation attachment site or incubation period.

Breeding season: Late winter to early spring, generally after heavy rains from late May to August

Clutch size: About 100 eggs per female

Fertilisation: Internal fertilisation by means of the male's modified anal fin

Gestation or incubation: Not reported. Hatching and larval development occur in the inundated habitat.

Age at maturity: About 25 to 30% of the population reaches sexual maturity at the end of the first year

Lifespan: Typically about 3 years, with some individuals surviving to 5 years

Generation time: Estimated at 1.7 years

Breeding habitat: Young fish

Hatchlings grow rapidly and can reach about 2.5 cm by summer. They are relatively large at hatching and resemble small adults.

Breeding habitat must therefore retain water long enough for eggs and young fish to develop before seasonal drying. The supplied documents do not give a separate juvenile home range.

  • Avoid draining, infilling or isolating breeding pools after rain has triggered spawning.
  • Schedule unavoidable work away from inundated breeding pools during the late May to August breeding period where practicable.

Sheltering habitat: Aestivation burrows

During seasonal drying, Salamanderfish shelter below the surface in mud or peaty substrate. This refuge is part of the habitat and can remain important when no fish are visible in the remaining water.

The fish burrows into peat or mud as pools dry and aestivates until substantial rain returns. Burrowing may be head first or tail first and is aided by a wedge-shaped skull, flexible vertebral column and reduced number of ribs.

The burrow is described as pear-shaped, with a thin tube connecting it to the surface. The fish may assume a U-shaped posture and secrete a mucus sheath around its body. The exact depth and dimensions of the burrow are not reported.

Aestivation period: Habitats may remain dry for at least 6 months

Burrow form: Pear-shaped, with a thin surface tube

Burrow size: Not reported

Other refuge feature: A mucus sheath around the body may assist survival during drying

  • Treat wetland beds, peat margins and damp mud around former pools as potential refuges during dry conditions.
  • Do not excavate, compact, strip or stockpile soil within dry seasonal wetland depressions without species-specific advice.
  • If disturbance to potential aestivation habitat cannot be avoided, obtain advice from the relevant Western Australian fauna authority and a freshwater fish specialist before works begin.

Threats: Hydrology and wetland loss

The main risk is loss of suitable wetland hydrology in a drying climate. Construction and infrastructure works can add local pressure by removing pools, compacting peat, altering drainage or reducing water quality.

Reduced rainfall has lowered stream flows and wetland depths in south-western Western Australia. Wetland depths have declined by about 3 cm per year over the last 20 years in the broader south-west, and drying is becoming more frequent.

The species is especially sensitive to wetland depth and the length of the drying period. Reduced groundwater levels, drainage, dewatering, diversion of runoff or altered culverts can shorten the inundation period and prevent successful breeding.

  • Map seasonal pools, former pools, drains, ditches, peat flats and downstream flow paths before clearing or earthworks.
  • Avoid lowering groundwater or diverting clean seasonal inflows away from occupied or potentially occupied wetlands.
  • Maintain wetland depth and inundation duration rather than relying only on a small permanent water area.

Threats: Clearing and construction

Clearing, deforestation and riparian destruction can remove pools, shading, peat substrates and drainage connections. Soil stripping, excavation and vehicle movement can also damage aestivation refuges in dry wetland beds.

Fragmentation is not quantified in the supplied documents, but the species has already lost much of its former range. Any isolated wetland that supports a remnant population should be treated as important habitat.

  • Keep machinery, access tracks, spoil, laydown areas and compounds outside seasonal wetland depressions and their peat margins.
  • Use clearly marked exclusion zones around known and potential habitat during clearing.
  • Prevent sediment, hydrocarbons, concrete washout, saline water and other pollutants from entering acidic pools or their inflows.
  • Have a stop-work procedure for Salamanderfish found during dewatering, excavation or wetland disturbance.

Threats: Fire, salinity and introduced animals

Increased frequency and intensity of bushfire, salinisation and declining water quality are identified threats. Exposure of acid sulfate soils can also cause acidification when wetlands become shallower or dry more often.

Introduced species, including feral pigs, are identified as additional threats. Freshwater crayfish and wading birds are reported as natural predators, although the lack of permanent water limits the presence of large fish predators in many sites.

  • Plan fire protection and fuel management so that wetland beds, peat margins and riparian vegetation are not unnecessarily disturbed.
  • Control access and drainage pathways that could increase salinity or expose acid sulfate soils.
  • Manage feral pigs and other introduced animals in accordance with approved regional programs.

Survey methodology: 1. Map and inspect potential habitat

Salamanderfish are restricted to south-west Western Australia, where they occupy shallow, seasonal pools, drains and peat wetlands. Surveys must account for dark tannin-stained water, very acidic conditions, seasonal drying and the species’ ability to aestivate in mud.

Before field sampling, map shallow ephemeral pools, peat flats, wetland depressions, drains and floodwater within and downstream of the work area.

Prioritise habitat between the Blackwood and Kent rivers, including seasonal pools and wetlands that may be dry when the site is inspected.

Record water presence, pool depth, water colour, pH, salinity, groundwater indicators, connected wetland areas and recent drying.

Treat dry pools as potential habitat because Salamanderfish can burrow into mud and aestivate until water returns.

Known distribution: Endemic to south-west Western Australia, between the Blackwood and Kent rivers.

Typical water: Shallow, dark or tea-coloured, tannin-stained and acidic water.

Reported pH: Approximately pH 3.0 to 6.5; FishBase reports pH 3.8 to 4.5.

Survey methodology: 2. Survey inundated habitat after rainfall

Survey when seasonal pools and wetlands contain water, with priority after autumn or winter rainfall and before the site dries again.

Use aquatic fish survey methods approved for the relevant state, such as fine-mesh dip-netting, trapping or other authorised methods suitable for small acidic wetlands.

Use repeated sampling of each separate pool or wetland unit where the project may affect habitat, because the species may be absent from the water column while aestivating.

Record survey dates, rainfall or inundation conditions, water depth, pH, conductivity or salinity, sampled area, method, effort, captures and non-detections.

Do not rely on a single visual inspection. The water can be dark and tannin stained, and the fish is small, reaching about 7 cm.

Breeding period: Breeding coincides with heavy rains, generally from late May to August.

Adult size: Maximum reported size is about 7.4 cm standard length for males and about 6.7 cm total length for females in FishBase; the Australian Museum reports about 7 cm overall.

Survey effort: The supplied documents do not specify a standard number of trap nights, transect length, survey hours or minimum sampling area. Set and justify effort in the project survey plan.

  • Obtain any required scientific, fish collection, animal ethics or national park approvals before capture, handling or release.
  • Use equipment that can be decontaminated between wetlands to reduce transfer of pathogens, sediment and aquatic weeds.
  • Release captured fish promptly into the same pool unless an authorised relocation is required by the approved fauna management plan.

Survey methodology: 3. Inspect dry wetland substrates

Where works will remove or compact dry pool beds, inspect the mud and peat substrate for aestivating fish and burrows before disturbance.

Use careful hand inspection and shallow excavation only where approved, because the aestivation burrow location and depth are not well understood.

Treat pear-shaped burrows, surface tubes, moist mud pockets and intact peat depressions as potential fauna habitat, even when no fish is visible.

Use a qualified aquatic ecologist to decide whether excavation, sediment removal or dewatering can proceed.

Aestivation: The fish can burrow into the substrate and survive seasonal drying, reportedly for at least 6 months in some habitats.

Burrow description: Reported burrows are pear-shaped, connected to the surface by a thin tube, with the fish adopting a U-shaped posture.

  • Do not assume that a dry wetland is unoccupied.
  • Stop excavation if a Salamanderfish or suspected aestivation burrow is found, and obtain direction from the project fauna manager or relevant wildlife authority.
  • Record the location, substrate condition, water status, photographs and any evidence of burrowing.

Survey methodology: Minimum effort and reporting

  • Prepare a site-specific survey design that covers every wetland, pool, drain and dry peat depression that may be directly or indirectly affected.
  • State the proposed method, sampling area, number of visits, timing, conditions, equipment, animal welfare controls and limitations because the supplied documents provide no species-specific minimum survey effort.
  • Repeat surveys when habitat changes from dry to inundated or when works will occur across different seasonal conditions.
  • Submit all confirmed records, negative survey results and habitat observations to the relevant Western Australian wildlife or biodiversity database, and retain the spatial data with the project environmental records.
  • Report the species as Endangered under Western Australian state information where that status applies, and verify the current legal listing before works commence.

Before habitat disturbance: 1. Avoid and minimise habitat loss

Avoid disturbance to seasonal wetlands first. Salamanderfish persistence is associated with wetland depth and shorter drying periods, while reduced rainfall, wetland drying and declining groundwater are linked to loss of range.

Redesign the footprint to retain shallow pools, peat flats, wetland depressions, drains and floodwater areas occupied or potentially occupied by Salamanderfish.

Maintain the hydrology of retained wetlands, including inflows, surface storage, groundwater access and the timing of inundation.

Prevent fill, spoil, sediment, hydrocarbons, concrete washout and other contaminants from entering retained pools or connected drainage lines.

Retain connectivity between nearby seasonal pools and wetlands where it can be maintained without creating a fish passage or disease risk.

Known response to hydrology: Population persistence is positively associated with wetland depth and negatively associated with the length of the drying period.

Recorded decline: The case study reports a 79% reduction in extent of occurrence and a 70% reduction in area of occupancy over the past 40 years.

  • Do not use a generic wetland buffer without assessing the wetland, its catchment and its flow paths.
  • Set project-specific no-go areas and hydrological protection zones in the fauna management plan.
  • Avoid works that shorten inundation periods, increase salinity or expose acid sulfate soils.

Before habitat disturbance: 2. Confirm approvals and timing

Check the current EPBC Act status and complete an EPBC referral assessment if the project may affect a nationally listed species or another protected matter.

Confirm Western Australian threatened species, fish collection, clearing, waterway, dewatering and wildlife handling requirements before ground disturbance.

Schedule in-water and wetland-disturbing works outside the period when pools are inundated and breeding is occurring where practicable.

If seasonal timing cannot avoid inundated habitat, stage the work around an approved aquatic fauna rescue and relocation plan.

Breeding period to avoid where practicable: Late May to August, when heavy rains generally trigger breeding.

Western Australian status in the supplied case study: Endangered under the Wildlife Conservation Act 1950, listed in 2016.

  • Obtain written approval for any capture, handling, temporary holding or relocation before the fauna spotter catcher starts work.
  • Include wetland hydrology, water quality, fire, feral pig, salinity, riparian damage and introduced species controls in the fauna management plan.
  • Allow time for a qualified aquatic ecologist to inspect the site after rain and before dewatering or earthworks.

Before habitat disturbance: 3. Prepare the work area

Complete a pre-clearance survey of all wetland and dry-pool habitat that may be disturbed, including areas beneath access tracks, laydown areas and temporary drainage works.

Mark retained wetlands, pool beds, peat flats, wetland inflows and no-go areas on plans and on the ground.

Install exclusion fencing where it will keep machinery, vehicles, spoil and people out of retained habitat without blocking necessary water movement.

Brief all operators on the species’ appearance, habitat, aestivation behaviour, stop-work procedure and reporting requirements.

  • Inspect fencing daily and after heavy rain.
  • Keep machinery on designated access routes and out of wetland beds unless the approved method specifically requires entry.
  • Prepare clean water, suitable containers, aeration and decontamination equipment if aquatic fauna rescue may be required.

During habitat disturbance: 1. Daily controls and spotter catcher duties

Works must be controlled around both wet and dry habitat. A dry pool is not evidence that Salamanderfish are absent, and a visible fish may be difficult to detect in dark water.

The fauna spotter catcher or aquatic ecologist must inspect the work area at the start of each shift and after rain, inundation or an unexpected change in drainage.

Keep the spotter catcher in direct communication with the machine operator and use a clear stop-work signal.

Maintain exclusion fencing, sediment controls, clean-water diversions and no-go markings throughout the work.

Prevent turbid water, saline water, chemicals, fuel, concrete and contaminated soil from entering retained wetlands.

  • Start each new work area with a toolbox briefing covering habitat limits, equipment hygiene and the response to a fish or burrow discovery.
  • Do not dewater, drain, compact or excavate a pool, peat flat or dry wetland bed until the approved inspection and fauna management steps are complete.
  • Use separate clean equipment for each wetland where practicable, and decontaminate nets, traps, boots and other aquatic equipment between sites.

During habitat disturbance: 2. Habitat feature handling

Treat wet pools, damp peat, mud burrows, pool margins, small drains and connected floodwater as fauna habitat during clearing and construction.

Keep wetland sediments and peat in place unless removal is approved by the fauna manager and relevant authorities.

If a pool must be dewatered, use a staged, supervised drawdown with aquatic fauna rescue measures specified in the approved plan.

Do not relocate captured fish to a different catchment or waterbody without written approval and disease, genetics and habitat suitability checks.

Handling concern: The species is small, occurs in acidic water and has a limited life cycle, so handling and water-quality changes should be minimised.

Relocation principle: The supplied documents support retaining remnant populations and protecting existing habitat, but do not specify a standard relocation distance or release density.

  • Stop work if the excavation exposes a suspected aestivation burrow or if fish are observed in water, mud or equipment.
  • Have the authorised aquatic fauna handler collect and temporarily hold the fish in clean, temperature-suitable water using low-stress methods.
  • Release rescued fish into the nearest suitable retained habitat only when directed by the approved plan and the relevant authority.
  • Do not allow untrained workers to handle, transport or release Salamanderfish.

During habitat disturbance: 3. Animal welfare and stop-work response

If a Salamanderfish is found, stop the activity that could affect it and establish a no-entry area around the find.

Notify the project ecologist, fauna manager and the relevant wildlife authority or permit holder before restarting work.

Keep the fish submerged in suitable clean water and minimise air exposure, handling time, noise and temperature change.

Send injured or distressed fish to an appropriately authorised aquatic wildlife carer, veterinarian or rehabilitation facility, as directed by the fauna manager.

  • Stop work for any confirmed Salamanderfish, suspected occupied aestivation burrow, unexpected fish mortality, major sediment release, fish stranding or loss of wetland connectivity.
  • Record the date, time, exact location, habitat condition, weather, activity underway, personnel, photographs, identification confidence, action taken and final outcome.
  • Restart only after the authorised person confirms that the control measures and any permit conditions have been met.

During habitat disturbance: 4. Incident and daily records

  • Maintain a daily register of wetland condition, water depth, water quality observations, rainfall, dewatering, captures, relocations, mortalities, injuries, stop-work events and corrective actions.
  • Map all records using the project coordinate system and retain photographs of habitat, burrows, fish and exclusion controls.
  • Report any unexpected mortality, illegal handling, failed relocation or wetland contamination immediately under the project approval and fauna management plan.
  • Submit verified occurrence records to the relevant Western Australian biodiversity or wildlife database.

After habitat disturbance: 1. Check the site after clearing

Post-work checks must confirm that retained wetlands remain connected, clean and capable of holding seasonal water. Monitoring should continue through both inundated and dry phases because Salamanderfish may be hidden in the substrate.

Inspect the cleared area, retained wetlands, drainage controls and wetland margins immediately after works and after the first substantial rainfall or inundation.

Check for stranded fish, exposed or damaged peat, blocked inflows, altered outflows, sediment deposition, salinity, contamination and unapproved changes in pool depth.

Inspect dry disturbed pool beds for burrows or fish before removing temporary controls or completing follow-on earthworks.

Repair fencing, erosion controls, clean-water diversions and wetland protection measures until the site is stable.

  • Complete a post-clearance aquatic fauna search where the approved plan requires it.
  • Photograph and map all restored and retained habitat features.
  • Escalate any fish mortality, reduced inundation, unexpected drying or water-quality change to the project ecologist and approval authority.

After habitat disturbance: 2. Monitor retained habitat and populations

Monitor retained wetlands through wet and dry conditions, including after winter rainfall and during the following dry period.

Measure or record pool depth, duration of inundation, water quality, salinity, pH, wetland area, drying duration and evidence of Salamanderfish presence.

Repeat the approved aquatic survey method at the same locations so results can be compared between visits.

Use monitoring results to adjust drainage, sediment, weed, predator and access controls.

Monitoring rationale: Persistence is associated with wetland depth and shorter drying periods, and the species has suffered substantial historical range loss.

  • Give particular attention to wetlands that have become shallower or dry for longer than before the project.
  • Continue monitoring long enough to detect both breeding-season presence and aestivation habitat condition.
  • Report results, limitations, mortalities and management changes to the land manager, regulator and relevant wildlife database where required.

After habitat disturbance: 3. Close-out and offsets

Do not close out fauna controls until the ecologist confirms that habitat protection, rehabilitation and monitoring obligations have been met.

If residual impacts remain, apply the approved offset, conservation payment or other statutory measure required by the relevant approval.

Document why impacts could not be avoided, the area and condition of affected wetland habitat, the rehabilitation outcome and any remaining risk to the species.

  • Keep all permits, fauna records, monitoring results, maps, photographs and incident reports with the project environmental record.
  • Update the fauna management plan if monitoring shows that works have altered wetland depth, drying duration, water quality or connectivity.

Rehabilitation actions: 1. Restore wetland form and hydrology

Rehabilitation should restore seasonal wetland function rather than only replanting the surface. Salamanderfish depend on shallow acidic wetlands, peat substrates, seasonal inundation and suitable places to aestivate.

Reinstate shallow pools, wetland depressions, peat flats, drains and floodwater areas using clean, compatible substrate.

Restore natural inflows and outflows so water can accumulate after seasonal rain without causing prolonged erosion or uncontrolled drainage.

Design the works to retain seasonal water and avoid increasing the length or frequency of drying.

Prevent salinity, acid sulfate soil exposure, sedimentation, nutrient enrichment and chemical contamination during rehabilitation.

Habitat condition: The species uses shallow streams, drains, temporary pools and peat wetlands with generally acidic, dark or tannin-stained water.

Hydrological target: Maintain wetland depth and reduce unnecessary extension of the dry period; the supplied documents do not provide a standard design depth or buffer width.

  • Do not line or seal a seasonal pool unless the approved ecological design requires it and demonstrates that wetland function will be retained.
  • Reconnect retained wetland units where the original surface-water connection can be safely restored.
  • Use local reference wetlands to guide substrate, depth variation, vegetation structure and inundation behaviour.

Rehabilitation actions: 2. Restore cover and habitat quality

Re-establish locally appropriate native wetland, peat-flat and riparian vegetation suited to the reference wetland and approved rehabilitation design.

Retain or reinstate natural leaf litter, peat structure, damp mud and shallow pool margins where these do not obstruct required flows.

Control weeds, feral pigs and other introduced animals that can damage wetland margins, disturb substrates or reduce water quality.

Manage fire in accordance with the local ecological fire regime and approvals, avoiding actions that remove riparian cover or expose peat soils.

  • Do not introduce fish, crayfish, aquatic plants or other organisms into restored wetlands unless specifically approved.
  • Prevent livestock, vehicles and repeated pedestrian access from compacting wetland beds or disturbing aestivation habitat.
  • Use locally sourced plant material where required by the rehabilitation plan and keep plantings outside open-water areas unless they are suitable wetland species.

Rehabilitation actions: 3. Verify rehabilitation success

Inspect restored wetlands after rainfall, during the breeding season and through the subsequent dry period.

Measure pool persistence, water depth, water quality, vegetation establishment, erosion, weed cover, feral animal impacts and evidence of Salamanderfish or suitable aestivation habitat.

Repeat authorised aquatic surveys at the same locations and with comparable effort to assess recolonisation or continued use by remnant populations.

Define success in the rehabilitation plan using site-specific measures for seasonal inundation, stable wetland margins, acceptable water quality, functioning connectivity and no unauthorised fish mortality.

Known information gap: The case study identifies a need to refine survival thresholds for groundwater depth and maximum aestivation periods and to identify populations most at risk.

  • Investigate failure if restored pools dry earlier or more often than reference wetlands.
  • Repair erosion, blocked flow paths, weed infestations, damaged fencing and other defects identified during monitoring.
  • Continue monitoring until the agreed success measures are met and the responsible ecologist documents the outcome.

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