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Bellinger River Saw-shelled Turtle (Myuchelys georgesi)

The Bellinger River Saw-shelled Turtle is a short-necked freshwater turtle restricted to the Bellinger River catchment in coastal north-eastern New South Wales. It uses clear, cool river pools with rocky beds and vegetated banks, so clearing, bank disturbance, sedimentation, altered flows, fox predation, introduced turtles and disease are important considerations on development sites.

Conservation status

Commonwealth, EPBC Act 1999: Critically endangered.

New South Wales, Biodiversity Conservation Act 2016: Critically endangered.

Breeding season

Bellinger River Saw-shelled Turtles are egg laying freshwater turtles. Gravid females have been recorded from September to November, with nesting from October to December. Eggs remain in river-bank nests for about 72 days, so clearing risk extends into February and also includes the winter period, when activity is reduced.

Reproductive mode: Egg laying; nesting is terrestrial.

Clutch size: 10 to 25 brittle-shelled eggs, averaging 15 to 20. Other records report one clutch of 10 to 15 eggs, or an average of 13.5 ± 3.2 eggs.

Incubation: About 72 days, at an average nest temperature of approximately 27°C.

Size at hatching: Not recorded.

Age at maturity: Males at about 5 to 6 years and females at about 8 years.

Nest or egg sites: Excavations in heavily vegetated river banks, within 10 m of the water's edge. Studied nests were about 170 ± 24 mm deep.

Breeding frequency: One clutch is reported, but the breeding frequency of individual females is not recorded.

Confirm timing locally before works, because rainfall and temperature can affect turtle activity, nesting conditions, incubation and hatchling emergence.

  • Mating: Mating timing is not recorded for this species. September to December is a practical precautionary period because females are gravid from September to November and nest from October to December.
  • Gravid females: Females are reported as gravid between September and November. Treat vegetated banks and nearby aquatic habitat as sensitive during this period.
  • Nesting: Females nest between October and December. Nests are in river-bank excavations, within 10 m of the water's edge, and in heavily vegetated areas.
  • Incubation: Eggs laid from October to December remain in nests for about 72 days. Nests may therefore contain eggs from October through February, depending on the laying date and local temperature.
  • Hatchlings: Hatchlings appear after about 72 days. Nests laid from October to December may produce emerging hatchlings from December through February.
  • Active period: The recommended survey period is September to February. This is the best documented period for detecting active turtles, although movement between pools can occur under normal river flows.
  • Winter inactivity: Activity is significantly reduced during winter, and turtles are rarely encountered. Plan aquatic and bank works carefully from June to August because turtles may be difficult to detect and may not move away from disturbance.
  • Highest clearing risk: Risk is highest from October to December, when gravid females and nesting activity overlap. Risk remains elevated through February because nests may contain developing eggs or emerging hatchlings, and winter inactivity adds a separate detection risk from June to August.

Identification

This is a moderately large, short-necked freshwater turtle with a broadly oval shell and a smooth rear shell margin. It is primarily aquatic and may be seen basking on river banks or on timber that has fallen into the channel.

Adults are brown above and dull whitish below. A yellow stripe from the angle of the jaws is especially distinct in young turtles. The shell is broadly oval, not extended at the rear, and lacks a central groove on the carapace.

The head and neck are shorter than the shell length. The neck has low, rounded tubercles, the tail lacks bright markings and each webbed forelimb has five claws.

Female carapace length: Up to 240 mm.

Male carapace length: Up to 185 mm.

Body form: Moderately large, short-necked and broadly oval-shelled.

Identification: Separating similar turtles

The species can resemble the Saw-shelled Turtle, Purvis's Turtle and Western Saw-shelled Turtle, but it is genetically distinct from those species. It also occurs with the Eastern Long-necked Turtle and introduced Emydura macquarii in the Bellinger catchment.

Do not treat every turtle reported as a Bellinger River Turtle as this species. The Bellinger River Emydura was a different taxonomic and management issue, and hybridisation between Emydura macquarii and Myuchelys georgesi occurs in the catchment. Morphologically atypical individuals should be photographed and referred for expert or genetic confirmation rather than identified from shell shape alone.

  • Check for the short neck, absence of a central carapace groove, smooth rear shell margin and five claws on each forelimb.
  • Record the yellow jaw stripe in young animals, while allowing for the fact that it may be less obvious in adults.
  • Photograph the head, carapace, plastron, limbs and tail when handling is authorised, especially if hybridisation is possible.

Identification: Field signs and handling

The most useful field observations are live turtles in pools, basking animals and nests in vegetated river banks. Individuals may move between pools under normal river flow conditions, but they rarely disperse overland.

The source documents do not provide diagnostic information for tracks, scats, calls, sloughs or eyeshine. Empty shell or carcass records should be retained and reported because disease-related mortality has previously affected much of the known range.

  • Search pool margins, exposed banks and fallen trees for basking turtles without approaching closely enough to cause them to enter the water.
  • Inspect suitable vegetated banks for excavated nests during the late spring and early summer nesting period, using methods that avoid collapsing or exposing nests.
  • Report sick, dead or unusually lethargic turtles through the relevant wildlife disease and threatened species channels, and prevent movement of equipment or animals between sites until biosecurity requirements are confirmed.

Distribution: National range

The species is endemic to New South Wales and has a very small range in the Bellinger catchment. No occurrence outside New South Wales is supported by the supplied documents.

In Australia, the species is restricted to the small Bellinger River drainage in coastal north-eastern New South Wales. The known river distribution extends from Bellingen township upstream to east of Brinerville.

It has not been recorded from the Never Never River, from all but the lower 600 m of the Rosewood River, or reliably from the Kalang River. Reports from the Kalang River have not been supported by recent records of genetically confirmed pure individuals, with hybrids detected there.

State range: New South Wales only.

Extent of occurrence: Estimated at 145 km² including potential Kalang River habitat, or 115 km² for the Bellinger River records alone.

Area of occupancy: Estimated at 5.2 km² of mapped riverine habitat, including the river bed and 20 m on either side.

Distribution: Known populations and trend

The principal known population is in the mid-section of the Bellinger River. The species was previously described as common or locally abundant within its restricted range, but a rapid mortality event began in early 2015 and affected the known distribution.

The current population size is not known. The 2015 estimate was 1,600 to 3,200 individuals after earlier estimates of about 4,500 plus or minus 1,400 individuals in 2005. At least 433 dead turtles were recovered during the 2015 event, mostly adults, and this was estimated to represent 14 to 27 percent of the total population at that time.

Earlier population estimate: About 4,500 plus or minus 1,400 individuals in 2005.

Population estimate in early 2015: 1,600 to 3,200 individuals.

Recorded 2015 mortality: 433 dead turtles recovered, with an estimated 14 to 27 percent of the population lost.

Disease mortality among infected turtles: Reported at 97 percent.

Distribution: Bioregional context

The supplied documents identify the range as coastal north-eastern New South Wales but do not assign the species to a named Interim Biogeographic Regionalisation for Australia bioregion. Site assessments should therefore use the mapped Bellinger catchment and verified records rather than a broad bioregion label.

Habitat: River habitat

The species is primarily aquatic and is associated with clear, cool, oxygen-rich river reaches. Habitat quality depends on deep rocky pools, connected river flow and intact vegetated banks.

Preferred habitat comprises moderate to deep pools, generally deeper than 2 m, with rocky substrates. The river system includes boulder rapids and still, sandy-bottomed sections, but turtles show a preference for pools with rocky beds.

The species is associated with clear water, continuous flow in most months, low particulate loads and highly oxygenated conditions. It can move between pools under normal river flow conditions.

Preferred pool depth: More than 2 m.

Headwater elevation context: The Bellinger River headwaters fall from about 1,300 m above sea level, although a species-specific elevation limit is not provided.

  • Retain deep pools, boulder margins and rocky stream beds within or downstream of a work area.
  • Prevent sediment and turbid construction runoff from entering pools or smothering rocky substrates.
  • Maintain aquatic connectivity between pools and avoid changes to normal flow conditions where practicable.

Habitat: Riparian structure

The catchment headwaters are predominantly forested, at about 60 percent forest cover. Native riparian vegetation supports bank stability, water quality and the vegetated nesting banks used by females.

Removal or degradation of riparian vegetation can increase turbidity and sedimentation of deep pools. It can also reduce suitable nesting cover along the water's edge.

  • Keep native riparian vegetation and overhanging bank cover intact wherever possible.
  • Use sediment controls that remain effective during rainfall and high flows.
  • Avoid stockpiling soil, gravel or spoil beside the river or its connected drainage lines.

Foraging habitat: Diet and feeding sites

The species is an omnivore that feeds mainly in the benthic zone. It uses aquatic habitat rather than travelling widely over land to find food.

A high proportion of the diet consists of benthic macro-invertebrates associated with the river bed. Fruit and aquatic vegetation are also eaten.

Feeding habitat is therefore concentrated around rocky pool substrates, submerged margins and other places supporting benthic invertebrate communities. The supplied documents do not provide a quantified foraging radius or home-range size.

Main prey: Benthic macro-invertebrates.

Additional foods: Terrestrial fruit and aquatic vegetation.

Foraging range: Not quantified; individuals can move between pools under normal river flow conditions.

  • Protect rocky substrates, submerged woody structure and clean pool margins that support benthic prey.
  • Prevent fine sediment from covering the river bed, reducing water quality or altering the invertebrate community.
  • Retain overhanging and riparian vegetation that can provide fruit and organic inputs to the stream.

Foraging habitat: Activity

Activity is significantly reduced during winter, when individuals are rarely encountered. The species supplements oxygen uptake through cloacal breathing in highly oxygenated water with low particulate loads, reducing the need to surface frequently.

Breeding habitat: Breeding biology

Breeding occurs on land beside the river, while incubation and hatchling emergence depend on undisturbed, vegetated banks close to suitable aquatic habitat.

Females excavate nests in river banks during late spring and early summer. The few studied nests were close to the water and in heavily vegetated areas.

Adults have a long generation time and populations are strongly dependent on survival of large adults. Loss of adult turtles can therefore affect population stability for many years.

Breeding season: Late spring to early summer.

Clutch size: 10 to 25 brittle-shelled eggs, averaging 15 to 20.

Nest depth: 170 plus or minus 24 mm in the few nests studied.

Nest distance from water: Within 10 m of the water's edge.

Incubation: About 72 days at an average nest temperature of approximately 27 degrees Celsius.

Hatching success: About 85 percent in the absence of predation.

Age at maturity: Males at about 5 to 6 years and females at about 8 years.

Maximum longevity: Estimated at about 29 years.

Generation length: Likely about 20 years.

  • Treat vegetated banks within 10 m of the water's edge as potential nesting habitat during the breeding season.
  • Avoid clearing, vehicle access, excavation, vibration and sediment deposition on likely nesting banks during late spring and early summer.
  • Control foxes and other nest predators around known or suspected nesting areas where authorised.

Breeding habitat: Nesting banks

Nests are excavated in terrestrial river banks within 10 m of the water's edge and in heavily vegetated areas. Maintaining connected native bank vegetation helps retain nesting structure and reduces erosion and sediment delivery to pools.

  • Mark and protect suitable vegetated banks before ground disturbance begins.
  • Use hand searches or other approved low-impact methods where nest detection is required, because brittle-shelled eggs may be damaged by excavation or vehicle traffic.
  • Keep lighting, noise and machinery away from nesting banks where possible during the laying and incubation period.

Sheltering habitat: Aquatic refuge

Sheltering habitat is mainly aquatic, with additional basking and nesting sites on the river bank. No den, burrow, hollow or roost structure has been reported for this species.

Moderate to deep pools, especially pools deeper than 2 m with rocky substrates, are the principal known refuge and activity sites. Individuals can move between suitable pools when river flows are normal.

Clear, well-oxygenated water is important because the species supplements breathing through the cloaca. Fine sediment, turbidity and loss of pool depth can reduce the suitability of these refuges.

Known refuge depth: Preferred pools are generally deeper than 2 m.

  • Identify and protect deep pools, rocky margins and connected refuge habitat before works start.
  • Do not isolate pools from the main channel or strand turtles during flow alteration, crossings or dewatering.
  • If a turtle must be captured for authorised relocation, use an approved fauna handling and disease-control procedure.

Sheltering habitat: Basking and terrestrial cover

Turtles bask on river banks and on trees that have fallen into the river. Heavily vegetated banks also provide nesting cover, although the species is rarely, if ever, an overland disperser.

  • Retain fallen trees in the channel where they do not create an unacceptable safety or flood risk.
  • Protect vegetated banks used for basking and nesting from unnecessary clearing and vehicle access.
  • Do not assume that absence of basking turtles means the habitat is unused, particularly during winter when activity is reduced.

Threats: Disease and population decline

The species has a very restricted range and is exposed to threats that act directly on river pools, riparian banks and adult survival. Disease and habitat degradation can affect the entire known distribution because it is concentrated in one catchment.

A rapid mortality event began in early 2015 and affected turtles throughout the known distribution from Bellingen upstream for about 60 km. A novel virus was associated with lesions, although the disease may have involved more than one factor.

The event mainly affected adults. Because the population is strongly skewed towards large, old individuals and adult survival is important to population stability, further disease or handling-related spread could have serious consequences.

2015 mortality event: 433 dead turtles were recovered, mostly adults.

Distribution affected: Sick and dead turtles were found from Bellingen upstream for about 60 km, covering the known distribution.

  • Apply site biosecurity procedures to nets, traps, boats, waders, vehicles and other equipment used in or near turtle habitat.
  • Do not move water, sediment, animals or equipment between catchments without following current disease-control requirements.
  • Immediately isolate and report sick or dead turtles according to current NSW wildlife disease directions.

Threats: Habitat degradation and hydrology

Removal or degradation of native riparian vegetation, increased turbidity and sedimentation of deep pools are documented threats. Low river levels and abnormal rainfall conditions were also associated with earlier population decline.

Construction crossings, bank works, dewatering, altered discharge and poorly controlled runoff can reduce pool depth, interrupt movement between pools or degrade benthic feeding habitat.

  • Avoid clearing native riparian vegetation beside occupied or potentially occupied river sections.
  • Design crossings and in-stream works to retain pool connectivity and normal movement pathways.
  • Keep sediment, concrete washout, fuels and other contaminants out of the river system.
  • Plan works for stable low-risk flow conditions only where this does not increase stranding, pool isolation or disease risk.

Threats: Predators and introduced turtles

Introduced European Red Foxes prey on nests and nesting females. A reported nest predation rate from foxes and goannas was 72 percent along the Bellinger River, and fox predation can be higher elsewhere.

Emydura macquarii appears to have been introduced to the catchment from nearby rivers. It competes with Myuchelys georgesi and hybridises with it, including production of F2 and backcross hybrids.

Reported nest predation: 72 percent in one Bellinger River study involving foxes and goannas.

Hybridisation: F2 and backcross hybrids have been confirmed in the Bellinger and Kalang rivers.

  • Control fox access to known nesting banks under an approved threat management program.
  • Do not release, relocate or introduce freshwater turtles into the Bellinger catchment.
  • Record atypical turtles and seek expert confirmation where Emydura macquarii or hybrids may be present.

Threats: Clearing, roads and fire

The supplied documents do not provide species-specific studies of road mortality or fire response. For project assessment, treat roads, machinery access and fire operations near river banks as potential disturbance risks because turtles use banks for basking and nesting, and nests occur close to the water.

Avoid direct disturbance to occupied pools and vegetated nesting banks, and refer proposed works that could alter access, drainage, bank structure or water quality for species-specific assessment.

  • Use exclusion zones around known pools, basking sites and likely nesting banks during clearing and construction.
  • Prevent vehicles from entering river banks and shallow margins unless access is authorised and controlled.
  • Keep firebreaks, burns, emergency access and vegetation removal out of nesting banks where practicable, with threatened species advice obtained before works.

Survey methodology: 1. Aquatic habitat inspection

Survey the Bellinger River Saw-shelled Turtle in suitable river habitat before works that may affect the Bellinger catchment. Focus on clear, flowing reaches with moderate to deep rocky pools, intact riparian vegetation and connected aquatic habitat.

Map all waterways, pools, rocky substrates, riparian vegetation and access points within and downstream of the work area.

Prioritise moderate to deep pools, generally deeper than 2 m, with rocky substrates because these are preferred habitat features.

Check whether the site connects to occupied river habitat, as the species can move between pools under normal flow conditions.

Treat all suitable habitat in the Bellinger catchment as potentially occupied unless current survey information demonstrates otherwise.

Survey methodology: 2. Visual and basking surveys

Search river margins, fallen trees and exposed banks for basking turtles, tracks and other signs.

Inspect pools and banks from several viewpoints, using methods that do not enter or disturb the water unless authorised.

Record the location, date, time, weather, water conditions, pool characteristics and number of turtles observed.

Do not rely on winter observations to demonstrate absence because activity is significantly reduced during winter.

Survey methodology: 3. Aquatic trapping and capture surveys

Use aquatic trapping only where it is authorised, supervised by suitably experienced personnel and covered by the project fauna management plan.

Place traps in suitable pools and check them at a frequency that prevents drowning, overheating or predation, with the exact method set by the project ecologist and permit conditions.

Handle captured turtles for the shortest practical time, identify them using approved methods and release them at the point of capture unless an approved relocation plan applies.

Use extra care because the species supplements oxygen uptake through cloacal breathing and is adapted to highly oxygenated water.

Survey methodology: 4. Survey timing and detection limits

Schedule surveys outside winter where practicable, when individuals are more active and more likely to be encountered.

Give particular attention to late spring and early summer because this is the breeding and nesting period.

Search terrestrial banks within 10 m of the water's edge for potential nests in heavily vegetated areas, without disturbing suspected nests.

Treat a failure to detect turtles as inconclusive because the species has a restricted distribution, uses patchily distributed pools and may be difficult to detect when inactive.

Survey methodology: Minimum effort and reporting

  • Have a suitably qualified ecologist set survey effort, equipment, trap placement and survey timing after reviewing the proposed disturbance, access constraints and current records.
  • Use more than one survey method where the work could affect occupied pools, river banks, riparian vegetation or connected waterways.
  • Record all live, dead, injured, hybrid or uncertain individuals with photographs, precise coordinates, habitat details and the action taken.
  • Report suspected disease, unusual mortality and all dead turtles promptly to the relevant NSW wildlife authority and follow its biosecurity directions.
  • Submit verified occurrence records to the relevant state wildlife database and provide survey and incident records to the approval authority.
  • Retain negative survey results, trap-check records, photographs, weather information and any permit conditions with the project environmental records.

Before habitat disturbance: Avoid and minimise

Plan works around the species' narrow aquatic range and its dependence on deep rocky pools, clean flowing water and vegetated river banks. Avoid entering or isolating suitable habitat wherever practicable.

  • Keep all works, access tracks, compounds and stockpiles out of deep pools, rocky channel habitat and vegetated river banks wherever practicable.
  • Retain riparian vegetation because its removal is associated with habitat degradation, increased turbidity and sedimentation.
  • Maintain aquatic connectivity between occupied or suitable pools and do not create barriers that prevent movement along the river.
  • Prevent sediment from entering pools, particularly deep pools used by turtles and their benthic food resources.
  • Avoid disturbing nesting banks within 10 m of the water's edge during late spring and early summer where practicable.
  • Do not assume a site is unoccupied because the species is absent from a single pool or survey period.

Before habitat disturbance: Approvals and project controls

  • Check the current EPBC Act status before works and refer the action if the project may have a significant impact on this nationally listed species or its habitat.
  • Obtain and comply with NSW threatened species, wildlife handling, trapping, relocation and rehabilitation approvals that apply to the work.
  • Include a species-specific fauna management plan in the construction environmental management plan.
  • Define authorised handlers, approved release sites, disease controls, stop-work triggers, reporting contacts and incident forms before mobilisation.
  • Check whether nearby turtles are genetically confirmed Myuchelys georgesi or possible Emydura macquarii hybrids, and do not release animals without an approved identification and relocation process.

Before habitat disturbance: Timing and site preparation

  • Stage works to avoid late spring and early summer nesting activity where practicable, and avoid winter surveys being used as the sole basis for clearance decisions.
  • Complete a pre-clearance survey of the channel, pools, banks, riparian vegetation and nearby terrestrial nesting areas before machinery enters the site.
  • Mark no-go areas, deep pools, vegetated banks, nest areas, access routes and retained habitat on plans and on the ground.
  • Install sediment, erosion and aquatic exclusion controls before disturbance begins, and use exclusion fencing only where it will not block turtle movement or trap animals.
  • Brief all operators and spotter catchers on the species' appearance, habitat, handling limits, reporting process and stop-work requirements.

During habitat disturbance: Daily controls and supervision

Keep a fauna spotter catcher involved whenever machinery or people may enter aquatic or riparian habitat. The spotter catcher must be able to stop the task and must work from a safe position with the operator.

  • Inspect exclusion fencing, sediment controls, pool protection and access points each day before work starts and after heavy rain or flow changes.
  • Keep machinery out of retained pools, river banks and marked riparian buffers unless the approved method specifically allows entry.
  • Use slow, controlled machinery movements near water and stop when visibility of the work area or escape route is lost.
  • Keep fuels, chemicals, spoil, concrete washout and loose sediment away from the channel and flood-prone banks.
  • Maintain a clear communication method between the spotter catcher, machine operator, supervisor and environmental officer.

During habitat disturbance: Animal handling and relocation

  • Stop the immediate task if a turtle is seen, trapped, injured, dead or found in a suspected nest or unsuitable work area.
  • Allow the authorised fauna handler to assess and handle the turtle, and do not permit workers or untrained personnel to pick it up.
  • Keep handling time short, support the animal securely and avoid placing it in direct sun, hot vehicles, contaminated containers or unsuitable water.
  • Relocate a healthy turtle only under the approved plan, to nearby retained habitat within the same connected catchment and outside the work area.
  • Do not move turtles between catchments or release an animal where identification, disease status or hybrid status is uncertain.
  • Keep Myuchelys georgesi separate from other turtles during temporary holding and follow approved hygiene and disinfection procedures because a severe disease event has affected this species.

During habitat disturbance: Injury, mortality and stop-work triggers

  • Take an injured turtle to an approved wildlife carer, veterinarian or government-approved facility as soon as practicable, using the project's wildlife emergency procedure.
  • Report dead or sick turtles immediately because the species has experienced rapid mortality events and disease-related deaths may require specialist response.
  • Stop work and notify the project ecologist if a turtle is found in the active work area, if a nest is discovered, or if sediment, fuel or other pollutants enter the water.
  • Stop work if exclusion fencing, dewatering, flow diversion or excavation could trap turtles or cut off movement between pools.
  • Record the location, condition, photographs, identification, time, handling, release or treatment details and names of authorised personnel for every incident.

After habitat disturbance: Completion checks

Confirm that disturbed areas no longer present a direct risk to turtles and that aquatic and riparian habitat remains connected and suitable. Keep controls in place until the site is stable.

  • Complete a post-clearance inspection of pools, channel margins, banks, riparian vegetation, access tracks, fencing and sediment controls.
  • Search the work area and any temporary exclusion zones for trapped, injured or dead turtles before removing controls.
  • Check that no spoil, sediment, concrete residue, fuel or rubbish has entered the river or accumulated in deep pools.
  • Remove temporary barriers only after the fauna ecologist confirms that turtles can move safely through the area.

After habitat disturbance: Monitoring and reporting

  • Monitor retained pools, banks and riparian vegetation at the frequency specified in the approval and fauna management plan.
  • Use repeat observations to check for turtles, unusual mortality, reduced water quality, bank erosion, sedimentation and loss of pool habitat.
  • Report all turtle records, incidents, disease concerns, mortalities, rehabilitation outcomes and corrective actions to the relevant approval authority.
  • Update the relevant state wildlife database with verified records and retain spatial data, photographs and monitoring results in the project file.

After habitat disturbance: Controls, offsets and corrective action

  • Maintain erosion, sediment, water quality and access controls until disturbed ground is stabilised and reinstated vegetation is established.
  • Repair failed controls promptly and review construction methods if sedimentation, bank damage or turtle mortality occurs.
  • Apply any approved offset, conservation measure or restoration commitment required under the EPBC Act or NSW approval.
  • Do not treat an offset as a substitute for avoiding damage to occupied pools, nesting banks and riparian habitat.

Rehabilitation actions: River and bank restoration

Rehabilitation should recreate the cool, clear and connected river habitat used by the species. Prioritise water quality, deep rocky pools, vegetated banks and safe movement between pools.

  • Reinstate stable, vegetated banks and protect them from further erosion and uncontrolled vehicle access.
  • Replant locally appropriate native riparian vegetation suited to the Bellinger catchment, using the project's restoration ecologist to select species and planting densities.
  • Reconnect disturbed channel margins and maintain natural flow paths without creating barriers between pools.
  • Restore or protect moderate to deep pools with rocky substrates where construction has altered pool form, subject to approved waterway design and engineering controls.
  • Prevent weed establishment and remove weeds using methods that do not contaminate the water or disturb turtle banks.

Rehabilitation actions: Habitat features and nesting areas

  • Retain or reinstate stable logs and natural basking structures along the river margin where they do not create a flood or infrastructure hazard.
  • Protect heavily vegetated nesting banks within 10 m of the water's edge from unnecessary disturbance.
  • Do not place artificial nest structures, rocks or logs in the channel unless they are designed and approved for this species and site.
  • Control foxes around nesting habitat through an approved predator management programme, because foxes prey on nests and nesting females.

Rehabilitation actions: Water quality, disease and monitoring

  • Keep restored water clear and well oxygenated by controlling sediment inputs, bank erosion and polluted runoff.
  • Use site-specific water quality triggers and inspection frequency in the rehabilitation plan, because the source documents do not provide numeric project thresholds.
  • Maintain hygiene controls between waterways and before handling turtles, equipment or containers used in aquatic surveys.
  • Monitor vegetation establishment, bank stability, sediment accumulation, pool depth and turtle use for the period required by the approval.
  • Set success measures that include stable vegetated banks, retained aquatic connectivity, no construction-related turtle mortality and verified turtle records in suitable habitat.
  • Review rehabilitation methods if monitoring shows continuing sedimentation, loss of deep pools, reduced connectivity, fox impacts or disease concerns.

Sources