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Finke Goby (Chlamydogobius japalpa)

The Finke Goby is a small, narrow-range freshwater fish endemic to permanent and near-permanent waterholes in the upper and mid Finke River system in the Northern Territory. It is listed as Vulnerable under Northern Territory legislation, so works affecting waterholes, springs, river banks, water quality or aquatic connectivity may require specific controls.

Conservation status

Northern Territory, Territory Parks and Wildlife Conservation Act 1976: Vulnerable.

Breeding season

The species breeds in summer, particularly after rain. Flow events can connect pools and support recolonisation, while permanent and near-permanent pools provide refuges during dry periods.

Month values are ordered January to December. A value of 0 means not typical, 1 means occurs or may occur, and 2 means peak or highest risk. Exact timing can vary with rainfall and flow events.

  • Breeding, spawning and egg guarding: Spawning occurs in summer, especially after rain. Females lay adhesive eggs in rock cavities or caves, and males guard and fan them until hatching.
  • Young fish and recruitment: Young fish may be expected after summer spawning, but the supplied documents do not give a precise hatching period, juvenile duration or recruitment peak.
  • Flow-driven movement and recolonisation: Heavy rainfall can cause river flow and fill temporary waterholes. Springs and persistent pools may provide source populations for recolonisation after rain; the timing varies with rainfall.
  • Highest clearing risk: Disturbance is most likely to harm the species during summer breeding and early recruitment, especially after rain when spawning is more likely. Waterhole and spring disturbance can also cause harm at any time because these sites act as refuges.

Identification

The Finke Goby is a very small bottom-dwelling goby of isolated desert waterholes. It is usually drab and well camouflaged, but breeding males develop more vivid blue and white fin colouration.

The body is usually pale yellowish-brown to grey-brown, with darker markings that form fine vermiculations and indistinct saddles or blotches. The first dorsal fin is small, with a blue median band and a paler yellowish submarginal band. The caudal and pelvic fins are large and rounded.

Typical length: 2 to 3 cm

Maximum length: About 5.5 cm

Identification: Sex and breeding colour

Breeding males show more vivid blue and white colouration in the fins. Females may be associated with adhesive eggs in rock cavities or caves, but the supplied documents do not provide a detailed sexing key.

Identification: Similar species and field signs

The species is closely related to the Desert Goby and its taxonomy remains under study. The supplied documents do not provide a full diagnostic comparison with the Desert Goby or other small fishes, so identification should use body pattern, fin shape, locality and habitat together, with photographs or specimens referred to an experienced fish taxonomist where required.

  • Look for small bottom-dwelling fish amongst detritus and vegetation on hard substrates in permanent or near-permanent waterholes.
  • During flow events, inspect the spaces between rocks, where Finke Gobies shelter and use their pelvic fins to anchor themselves.
  • Do not rely on tracks, scats, calls, nests, sloughs or eyeshine, as these signs are not expected to identify this fish.

Distribution

The Finke Goby is known only from the Northern Territory portion of the Finke River system. Its range is narrow, patchy and associated with isolated permanent or near-permanent waterholes.

The species is restricted to the upper and mid Finke River, from the headwaters to approximately 300 km downstream. It occurs in the Finke River catchment in the Northern Territory and is not reported from another Australian state in the supplied documents.

Known state range: Northern Territory only

Linear extent reported: Headwaters to approximately 300 km downstream in the upper and mid Finke River

Bioregion: Not specified in the supplied documents

  • Known localities include the Finke Gorge National Park and Tjoritja/West MacDonnell Ranges National Park.
  • The species was historically recorded in the Palmer River sub-catchment, a major Finke River tributary, but is now likely extirpated there despite suitable habitat remaining.

Distribution: Strongholds and subpopulations

Permanent and near-permanent waterholes are the main known habitat units. Springs may act as refuges and as source populations for recolonisation of temporary waterholes after rainfall and flow events.

  • Prioritise spring-fed and other permanent or near-permanent waterholes for pre-clearance assessment and protection.
  • Treat isolated waterholes as potentially separate subpopulations because the species occurs patchily and the river is ephemeral.

Distribution: Population status

The supplied documents do not provide a total population estimate, density estimate or quantified population trend. The species is described as patchily distributed, and ongoing monitoring is recommended to detect declines across the Finke River system.

Population size: Not reported

Population trend: Not quantified; monitoring is required

Historical change: Likely extirpated from the Palmer River sub-catchment

Habitat: Waterbody and river setting

Finke Gobies occupy isolated desert waterholes in an ephemeral river system. Habitat suitability depends on water persistence, water quality, hard substrates and refuges that remain available between flow events.

The species occurs in permanent and near-permanent waterholes of the upper and mid Finke River. Temporary waterholes may be used after heavy rainfall when the river flows and pools are refilled.

  • Assess permanent, near-permanent and long-lasting shallow pools within the project footprint and downstream of works.
  • Include nearby springs because they may support refuge populations and recolonisation after flooding.

Habitat: Physical and water features

Occupied pools can have substantial variation in water temperature, salinity and pH. Shallow, highly saline pools may be important for breeding, even when they are not permanent.

Reported temperature tolerance context: Pools occupied by the species can vary substantially; a specific wild tolerance range is not provided.

Reported salinity context: The species tolerates highly saline water, including salinities up to or greater than seawater in captivity.

Reported pH context: Occupied pools can vary substantially in pH.

  • Retain gravels, cobbles, rocks and other hard-bottomed areas, particularly where cavities or caves occur.
  • Avoid sediment entry, bank collapse and changes to pool persistence that could reduce water quality or fill shallow pools.
  • Consider low dissolved oxygen and algae blooms as potential signs of degraded waterhole condition.

Habitat: Vegetation and substrate

The Finke Goby is commonly found amongst detritus and vegetation on hard-bottomed substrates. The supplied documents do not identify a specific riparian plant community or elevation limit.

Elevation limit: Not reported

Specific vegetation community: Not reported

Key substrate: Hard bottom with rocks, gravels and cobbles

  • Map aquatic vegetation, detritus, gravels, cobbles, rocks and bank undercutting during aquatic habitat inspections.
  • Keep livestock, feral horses and feral camels away from waterhole margins where trampling can erode banks and infill pools.

Foraging habitat: Diet

The Finke Goby is an omnivorous bottom-feeder. It feeds close to the substrate in waterholes, among vegetation and detritus on hard bottoms.

The diet includes small crustaceans, insect larvae, filamentous algae and detritus. A related account also describes algae and small invertebrates as food items.

Animal prey: Small crustaceans and insect larvae

Plant and organic food: Filamentous algae and detritus

  • Inspect shallow margins, hard bottoms, aquatic vegetation and detritus for feeding habitat.
  • Avoid disturbing or removing the substrate and organic material that support small invertebrates and algae.

Foraging habitat: Feeding location and range

The species is a bottom-dweller and uses its pelvic and caudal fins to move short distances from the river bottom. No foraging range, home range or territory size has been reported.

Foraging range: Not reported

Locomotion while feeding: Short movements from the river bottom using the pelvic and caudal fins

  • Treat the full wetted area of an occupied pool, including shallow margins and rock-strewn sections, as potential feeding habitat.
  • Do not infer absence from a short visual inspection because the fish can shelter amongst rocks, vegetation and detritus.

Breeding habitat: Breeding biology

Spawning occurs in summer, particularly after rain. Breeding requires cavities or caves in hard substrates, and males guard the eggs until hatching.

A female lays adhesive eggs in a rock cavity or cave. The male guards the eggs and fans them almost constantly until they hatch. Shallow, highly saline pools may provide important breeding habitat, even where the pools are not permanent.

Breeding season: Summer, especially after rain

Clutch size: Not reported

Egg type: Adhesive eggs

Egg site: Rock cavities or caves

Parental care: The male guards and fans the eggs until hatching

Gestation or incubation: Not reported

Age at maturity: Matures rapidly; exact age is not reported

Lifespan: Rarely beyond three years

  • Protect rock cavities, caves, gravels, cobbles and undercut structures within and around occupied pools.
  • Avoid works that increase sediment deposition or reduce water persistence in shallow breeding pools.
  • Schedule aquatic disturbance outside the summer breeding period where practicable, particularly after rainfall when spawning is more likely.

Breeding habitat: Breeding habitat features

Suitable breeding habitat includes hard-bottomed shallow pools with gravels, cobbles and rock cavities. Some of these pools may be long-lasting between flows but are not permanently inundated.

  • Survey rock margins, cavities, caves and shallow saline pools after rainfall and during the summer period.
  • Maintain hydrological connections and source refuges where they support recolonisation of ephemeral pools after flow events.

Sheltering habitat: Waterhole and spring refuges

Refuge habitat is provided by persistent waterholes, springs, rocks, vegetation and detritus. These features allow the species to survive dry periods and to shelter during river flows.

Permanent and near-permanent waterholes are refuges in the ephemeral Finke River. Springs may provide refuge sites and source populations for recolonisation of ephemeral sites after rain.

  • Identify and protect spring-fed pools and other persistent waterholes before works begin.
  • Maintain water depth, water quality and pool persistence by controlling sediment, bank erosion and stock access.

Sheltering habitat: Physical cover

The Finke Goby shelters between rocks during flow events and uses its pelvic fins to anchor in place. It is also found amongst detritus and vegetation on hard-bottomed substrates.

Known refuge structures: Spaces between rocks, rock cavities or caves, detritus and vegetation

Refuge size: Not reported

  • Retain rock cover, cavities, cobbles, gravels, aquatic vegetation and detritus where they occur in occupied or potentially occupied pools.
  • Avoid clearing or reshaping pool margins, rock beds and undercut banks without targeted aquatic fauna assessment.

Threats: Waterhole degradation

The main risks are degradation or loss of persistent waterholes, invasive fish and changes to desert pool condition. Project impacts can arise through bank disturbance, sediment delivery, altered flows and poor water quality.

Livestock, feral horses and feral camels can trample banks, cause soil erosion and infill waterholes and shallow pools. These impacts can reduce water quality through low dissolved oxygen and algae blooms.

  • Exclude stock and feral large herbivores from sensitive waterhole margins where practicable.
  • Use erosion and sediment controls around banks, access tracks, crossings and work areas.
  • Prevent spoil, concrete washout, fuel, chemicals and other pollutants from entering pools.

Threats: Hydrology and climate

The species depends on permanent and near-permanent waterholes in an ephemeral river system. Loss of spring-fed refuges and changes in the availability or condition of desert pools increase risk, including through climate change.

  • Avoid drainage, dewatering, diversion, infilling or altered flow paths that reduce pool persistence.
  • Protect springs and source populations that may support recolonisation after rainfall and flooding.
  • Assess cumulative effects on connected waterholes rather than treating each pool as an isolated construction area.

Threats: Invasive fish

Eastern Gambusia is a potential significant threat. It is not currently recorded in the Finke River system, but it is spreading through artificial and natural waterbodies in central Australia, and competition from Gambusia has been linked to declines in other central Australian gobies.

  • Do not move water, fish, aquatic plants, equipment or sediment between catchments without appropriate biosecurity controls.
  • Inspect and clean pumps, nets, buckets, vehicles and other aquatic equipment before use at another waterbody.
  • Report suspected Gambusia or other introduced fish through the relevant Northern Territory reporting pathway.

Threats: Vegetation and other pressures

Invasive grasses and climate-related changes to desert pools are additional concerns. The supplied documents do not identify a specific disease, road mortality rate, predator impact or fire response for the Finke Goby.

  • Manage invasive grass spread and avoid unnecessary disturbance of riparian and aquatic margins.
  • Assess road crossings and construction access for sediment, bank erosion, isolation of pools and direct aquatic habitat loss.
  • Seek project-specific advice where fire, disease or introduced predators may affect an occupied waterhole, because species-specific evidence is limited.

Survey methodology: 1. Habitat assessment and mapping

The Finke Goby is a narrow-range fish restricted to isolated permanent and near-permanent waterholes, springs and connected habitats in the upper and mid Finke River. Survey effort should focus on aquatic habitat that may be directly removed, dewatered, isolated or degraded by the project.

Map all permanent and near-permanent waterholes, springs, shallow pools, connected channels and refuge habitats within and downstream of the project area.

Record water depth, flow, substrate, aquatic vegetation, detritus, undercut banks, rocks, cobbles, gravel and water quality conditions.

Give particular attention to spring-fed sites and pools that remain wet between flow events, because these may support refuge and source populations.

Known distribution: Upper and mid Finke River, from the headwaters to approximately 300 km downstream

Typical adult size: Up to around 5.5 cm, more commonly 2 to 3 cm

Survey methodology: 2. Aquatic fish surveys

Use methods suitable for small bottom-dwelling fish in shallow pools, including seine netting, hand nets, baited or unbaited traps, visual searches and other approved fish survey methods selected for the site and water conditions.

Search among detritus and vegetation on hard-bottomed substrates, around rocks and cobbles, and near spring outlets or other areas that may provide refuge.

Record survey effort separately for each waterhole or pool, including the area searched, method, duration, number of nets or traps, trap nights, weather, water level and water quality.

Obtain all required permits before handling or capturing fish, and use trained personnel and decontamination procedures to prevent movement of fish, pathogens or aquatic weeds between sites.

Survey methodology: 3. Timing and detection conditions

Survey permanent and near-permanent pools before disturbance and repeat the assessment after rainfall or flow events where the works could affect temporary pools or connectivity.

Include summer surveys where practicable, because spawning occurs in summer and is especially associated with rain.

Inspect shallow, highly saline pools as well as fresher refuge pools, because saline pools may be used for breeding and can be unsuitable for livestock to drink.

Do not treat a negative result as evidence of absence where waterholes are isolated, water levels are low, turbidity is high or access to submerged cover is poor.

Breeding period: Summer, especially after rain

Water tolerance: Pools may vary substantially in temperature, salinity, pH and dissolved oxygen

Survey methodology: Minimum effort and reporting

Prepare a site-specific survey design that covers every waterhole, spring, shallow pool and connected reach that could be affected, because the supplied documents do not specify a species-specific number of nights, hours, trap nights, transect length or minimum area.

Use more than one approved detection method where habitat access, turbidity or water depth could reduce detection, and document the reason for the selected effort.

Record the date, observers, coordinates, waterbody name, survey method, effort, weather, rainfall or flow history, water conditions, captures, photographs and any evidence of introduced fish.

Submit verified records and negative-survey information to the relevant Northern Territory wildlife records database and provide the records to the project regulator and land manager.

Report any Eastern Gambusia or other introduced fish immediately through the relevant regulatory pathway, because early detection and control are identified management priorities.

Before habitat disturbance: Avoid and minimise habitat loss

Avoid direct loss and degradation of the waterholes and spring habitats on which the Finke Goby depends. Plan the project around retaining wet refuges, suitable spawning substrate and movement pathways between aquatic habitats.

Retain permanent and near-permanent waterholes, spring outlets, shallow pools, gravel, cobble and rock substrates, aquatic vegetation, detritus and undercut banks.

Keep livestock, feral horses and feral camels away from retained waterholes and banks where practicable, because trampling can erode banks, infill pools and reduce water quality.

Prevent changes to surface-water flow, groundwater inputs, pool persistence and downstream connectivity that could remove refuge sites or prevent recolonisation after flooding.

Do not discharge sediment, concrete washout, hydrocarbons, chemicals or contaminated water into occupied or potentially suitable pools.

Before habitat disturbance: Approvals and project planning

Confirm the current national and Northern Territory conservation status before works commence, noting that the species is not listed under the EPBC Act and is Vulnerable under Northern Territory legislation.

Obtain any Northern Territory permits required for fish capture, handling, relocation, disturbance of aquatic habitat or works in protected areas.

Refer the action under the EPBC Act if another listed matter or project impact triggers that legislation, even though the Finke Goby itself is not nationally listed.

Prepare a fauna management plan that identifies aquatic exclusion zones, survey triggers, authorised handlers, water-quality controls, dewatering procedures, relocation arrangements, stop-work rules and reporting requirements.

EPBC Act: Not listed

Northern Territory status: Vulnerable under the Territory Parks and Wildlife Conservation Act 1976

Reported conservation reserves: Finke Gorge National Park and Tjoritja/West MacDonnell Ranges National Park

Before habitat disturbance: Pre-clearance preparation

Complete the aquatic habitat survey and pre-clearance inspection immediately before works, particularly after rain or flow events that may fill temporary pools.

Mark all retained waterholes, springs, wet depressions, riparian zones, aquatic vegetation, hard-bottomed spawning substrate and access routes on construction plans and on the ground.

Install exclusion fencing or clearly marked no-go zones where this will keep machinery, vehicles, stock and personnel away from retained pools and banks.

Stage works so that any unavoidable disturbance occurs outside occupied water and so that suitable retained habitat is available before fish are moved or affected.

During habitat disturbance: Daily controls and machinery coordination

The fauna spotter catcher should control access to aquatic habitat and coordinate each work step with the operator. Work should stop if fish, occupied habitat or an uncontrolled water-quality risk is encountered.

Inspect exclusion fencing, sediment controls, dewatering equipment and retained pools at the start of each shift and after rainfall.

Brief operators on the mapped no-go areas, access routes, exclusion distances set in the fauna management plan and the requirement to stop on the spotter catcher's instruction.

Keep machinery, refuelling, spoil, wash-down water and stockpiles out of waterholes, springs, shallow pools and their banks.

Use staged clearing and supervised access so the spotter catcher can inspect each work area before machinery enters it.

During habitat disturbance: Aquatic habitat and fauna handling

Do not remove rocks, cobbles, gravel, detritus or aquatic vegetation from retained habitat unless the approved work method requires it and the action has been assessed and permitted.

Treat dewatering, diversion, culvert installation, bank excavation and isolation of a pool as high-risk activities requiring a site-specific fish rescue and relocation procedure.

Only an appropriately authorised and experienced person should capture, handle or relocate a Finke Goby, using equipment and water containers that will not injure small fish or spread disease and invasive species.

Relocate captured fish only to suitable nearby retained habitat approved by the relevant authority, with similar water quality, cover and flow conditions, and record the release location and number of fish.

During habitat disturbance: Finds, injuries and stop-work triggers

Stop work and protect the site if a Finke Goby is found, if fish are stranded, if a pool is unexpectedly connected to the work area, or if sediment, pollutants or altered flow enter aquatic habitat.

Notify the environmental manager and the relevant Northern Territory authority before restarting work where the find or impact is outside the approved fauna management procedure.

Do not keep, sell or transport the species unless the activity is specifically authorised, noting that the species is Vulnerable in the Northern Territory and has a narrow distribution.

Place injured fish in suitable clean, oxygenated water and arrange assessment by an appropriately authorised aquatic wildlife professional or veterinarian; record deaths and injuries.

Record the date, time, coordinates, waterbody, activity, person who made the find, identification evidence, action taken, release site, condition and photographs.

After habitat disturbance: Post-clearance inspection

Post-work checks must confirm that retained pools remain usable and that construction has not reduced water quality, refuge habitat or connectivity. Keep controls in place until the site is stable and monitoring shows that agreed outcomes have been met.

Inspect all disturbed and retained waterholes, springs, shallow pools, banks and drainage structures after clearing and after the first substantial rainfall or flow event.

Check for sediment infilling, bank erosion, altered pool depth, reduced spring flow, low dissolved oxygen, algal blooms, blocked movement pathways and loss of gravel, cobble or rock cover.

Remove construction materials and repair failed sediment, exclusion or access controls before demobilising.

After habitat disturbance: Monitoring and reporting

Repeat fish and habitat monitoring at the frequency set in the approval or fauna management plan, with additional surveys after major rainfall, flooding, dewatering or pollution events.

Compare observations with the pre-work records, including water level, water quality, habitat condition, fish detections, introduced fish and evidence of recolonisation.

Report Finke Goby records, mortality, habitat damage, control failures and any Eastern Gambusia detection to the project regulator, relevant Northern Territory authority and wildlife records database.

Maintain records of all captures, relocations, injuries, deaths, incidents, corrective actions and follow-up survey results.

After habitat disturbance: Offsets and corrective action

Determine whether an offset, restoration action or additional management measure is required under the approval framework if permanent or near-permanent refuge habitat is lost or degraded.

Prioritise protection and restoration of core refuge waterholes, spring-fed sites and riparian habitat rather than relying only on replacement habitat elsewhere.

Implement corrective works if monitoring identifies declining habitat condition, reduced pool persistence, failed connectivity or new introduced fish threats.

Rehabilitation actions: Waterhole and riparian restoration

Rehabilitation should restore the aquatic refuges and bank condition that support the Finke Goby between flow events. The target is functioning waterhole and spring habitat with suitable cover, spawning substrate, water quality and protection from stock and feral animals.

Regrade or stabilise eroded banks using methods that retain natural pool shape, shallow margins and access to hard-bottomed habitat without filling or simplifying the waterhole.

Reinstate suitable gravel, cobble, rock, detritus and aquatic vegetation where these features were removed, using clean material that cannot introduce weeds, pathogens or invasive fish.

Maintain or restore surface-water and spring connections needed for refuge use and recolonisation after flooding.

Exclude livestock, feral horses and feral camels from recovering banks and pools until vegetation and bank stability are established.

Rehabilitation actions: Threat control

Control invasive grasses and other weeds where they alter pool margins, flow, bank stability or aquatic habitat.

Use clean equipment and approved wash-down procedures to prevent the introduction or spread of Eastern Gambusia and other invasive fish between waterbodies.

Do not stock or move fish into rehabilitated pools unless this is authorised as part of an approved conservation program.

Manage fire, access and grazing in accordance with the site plan where these activities could damage riparian vegetation or increase erosion.

Rehabilitation actions: Monitoring and success measures

Monitor water permanence, spring flow, bank stability, sediment accumulation, water quality, aquatic vegetation, hard-bottomed cover and fish detections against the pre-disturbance baseline.

Use summer and post-rain monitoring where practicable to check whether spawning habitat and juvenile fish are present.

Treat rehabilitation as successful only when the agreed habitat features are functioning, water quality is suitable, erosion and infilling are controlled, and monitoring shows continued use by Finke Gobies or recovery of suitable refuge habitat.

Continue monitoring for introduced fish and act promptly if Eastern Gambusia is detected.

Relevant life-history timing: Spawning occurs in summer, especially after rain; juveniles may depend on persistent refuge pools between flow events

Sources