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Yalmy Galaxias (Galaxias sp. nov. 'yalmy')

The Yalmy Galaxias is a small freshwater fish known only from tributaries of the Snowy River in East Gippsland, Victoria. It inhabits shallow, clear, flowing and partly shaded streams, with cobble riffles providing important habitat.

Conservation status

Commonwealth, EPBC Act 1999: Critically endangered.

Victoria, Flora and Fauna Guarantee Act 1988: Critically endangered.

Seasonal planning

Spawning may occur from late spring through summer in Victoria, but the period is unknown.

Seasonal evidence: From published sources for this species.

Timing varies between sites and years.

  • Possible spawning season: Spawning may occur from late spring through summer in Victoria, but the period is unknown.

Identification: Appearance

It is a small, scaleless, fusiform fish, reaching about 80 mm in total length.

It is a small, scaleless, fusiform fish, reaching about 80 mm in total length.

Identification: Confirming identity

Confirm the identity of any suspected record with a specialist and a photograph or voucher, as required by the relevant permit.

Distribution: Known range

It is known from the mid-reaches of the Yalmy River system, including Serpentine Creek, and the lower Rodger River in East Gippsland, Victoria. The known distribution is a short stream reach at approximately 140 to 250 m above sea level.

It is known from the mid-reaches of the Yalmy River system, including Serpentine Creek, and the lower Rodger River in East Gippsland, Victoria. The known distribution is a short stream reach at approximately 140 to 250 m above sea level.

Distribution: National mapping

The Commonwealth species distribution model (SNES) maps where the species or its habitat is known, likely or may occur. Use it with local records and site inspection.

Habitat: Habitat

It occurs in shallow, clear, flowing and partly shaded streams in forested catchments, generally 2 to 5.5 m wide and with predominantly cobble substrate. It favours fast-flowing riffles and is absent from deeper pools and slower-flowing areas.

It occurs in shallow, clear, flowing and partly shaded streams in forested catchments, generally 2 to 5.5 m wide and with predominantly cobble substrate. It favours fast-flowing riffles and is absent from deeper pools and slower-flowing areas.

Foraging habitat: Diet

Not documented in the published sources used for this profile.

Not documented in the published sources used for this profile.

Breeding habitat: Breeding

Not documented in the published sources used for this profile.

Not documented in the published sources used for this profile.

Sheltering habitat: Shelter

Adults are solitary and cryptic during the day, sheltering among rocks on the stream bed. Young fish may swim mid-water or near the surface.

Adults are solitary and cryptic during the day, sheltering among rocks on the stream bed. Young fish may swim mid-water or near the surface.

Threats: Threats

Sedimentation can fill cobble habitat and reduce the fast-flowing riffles it uses. Predation by introduced trout, bushfire-related sedimentation, drought, and erosion affecting water quality are also identified as threats.

Sedimentation can fill cobble habitat and reduce the fast-flowing riffles it uses. Predation by introduced trout, bushfire-related sedimentation, drought, and erosion affecting water quality are also identified as threats.

Threats: Works risk

Ground disturbance or construction that increases sediment entering streams could infill cobble habitat and reduce suitable riffles. In-water works that disturb or cover the stream bed could also affect the substrate used by the fish.

Survey methodology: 1. Commonwealth guidance

Use methods consistent with the Commonwealth survey guidelines and engage a specialist with the right permits.

For EPBC Act referrals, survey effort and methods should be consistent with the survey guidelines for Australia's threatened fish, read with the Significant impact guidelines 1.1.

Survey methodology: 2. Limits

A non-detection is not proof of absence. Match survey timing to the species and season, and record effort.

Vegetation associations

Source-checked associations and automatically indexed candidates are separated below. An association does not establish site presence, preference or dependence.

No species-specific vegetation association has been indexed or source-checked in this evidence library. This is an evidence gap, not evidence of no association.

Ecosystem associations

Source-checked associations and automatically indexed candidates are separated below. An association does not establish site presence, preference or dependence.

No species-specific ecosystem association has been indexed or source-checked in this evidence library. This is an evidence gap, not evidence of no association.

Soil and substrate associations

Source-checked associations and automatically indexed candidates are separated below. An association does not establish site presence, preference or dependence.

No species-specific soil association has been indexed or source-checked in this evidence library. This is an evidence gap, not evidence of no association.

Water and wetland associations: Water-associated habitat mentioned in profile

Source-checked associations and automatically indexed candidates are separated below. An association does not establish site presence, preference or dependence.

It occurs in shallow, clear, flowing and partly shaded streams in forested catchments, generally 2 to 5.5 m wide and with predominantly cobble substrate.

Automatically indexed from existing profile text. Not a verified preference, mapped occurrence or habitat requirement. Check the original source and regional qualifiers before use.

Evidence: Unreviewed profile-derived candidate

Confidence: Not independently verified

Region: Scope as described in the quoted profile text; not independently verified. Profile states: VIC.

Habitat use: general

Fauna records and mapped habitat: Not yet analysed

Record locations can be overlaid with mapping, but record frequency alone does not measure habitat preference. No species is excluded from desktop assessments by this analysis.

No quality-controlled record-to-map analysis has been completed for this species. The existing generalised distribution dots and indicative range polygons have not been treated as precise occurrence coordinates.

A defensible run needs dated, independently attributable records, coordinate uncertainty, duplicate and captive-record checks, layer versions and regional scope. Preference and absence require additional survey-effort and detection evidence.

Habitat limitations and contrary evidence: No supported exclusion recorded

Not recorded is not the same as cannot occur. Low suitability, resident habitat, breeding habitat and occasional movement are different conclusions.

This library has not established a vegetation, ecosystem or soil-type exclusion for this species. This does not mean all habitat is suitable; the evidence needed to justify an exclusion has not been assembled.

Habitat limitations and contrary evidence: Before using a negative association

  • Confirm the taxon, geographic region, life stage and habitat function covered by the evidence.
  • Check survey methods, season, repeated effort and detectability before interpreting non-detection.
  • Investigate credible contradictory records and microhabitats absent from broad mapping.
  • Do not convert a missing map class, low record count or failed data request into species absence.

Before disturbance: 1. Desktop and approvals

Confirm whether the project could affect the species before works begin.

Check national mapping, state records and recent surveys for the site. An action likely to have a significant impact on this nationally listed species needs EPBC Act referral, and state permits apply where it is state listed.

Before disturbance: 2. Plan to avoid

Design the footprint, timing and access to avoid known or likely habitat, and brief crews on what to look for and who to call.

During disturbance: 1. Controls

Keep works inside the approved footprint and conditions.

Fence or mark habitat to be retained and keep machinery, stockpiles and spoil out of it.

During disturbance: 2. Stop and report

If the species is found unexpectedly, stop work at that spot and contact the project ecologist and the relevant agency.

After disturbance: 1. Records

Record outcomes.

Record sightings, habitat lost or retained and any injury or death, and report them under the approval conditions.

Rehabilitation: 1. Restore

Restore disturbed habitat where possible.

Reinstate disturbed ground with local species, return logs, rocks and litter, and control weeds and erosion until the site is stable.

Sources