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White's Seahorse (Hippocampus whitei)

White's Seahorse is a fish endemic to eastern Australia, occurring from Queensland to New South Wales. It lives in shallow coastal embayments and estuaries, where seagrass, sponges and soft corals provide important habitat.

Conservation status

Commonwealth, EPBC Act 1999: Endangered.

Queensland, Nature Conservation Act 1992: Endangered.

Commonwealth, EPBC Act 1999: Listed marine. A listed marine species under Part 13 of the EPBC Act. Killing, injuring, taking or moving it in a Commonwealth area needs a permit.

Seasonal planning

White’s Seahorse breeds from September to April in Australian waters.

Seasonal evidence: From published sources for this species.

Timing varies between sites and years.

  • Breeding season: White’s Seahorse breeds from September to April in Australian waters.

Identification: Appearance

A medium-sized seahorse, it reaches a maximum total length of about 16 cm.

A medium-sized seahorse, it reaches a maximum total length of about 16 cm.

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

White's Seahorse occurs along the east coast of Australia, from north of Mackay in Queensland to Sussex Inlet in New South Wales. It is locally abundant in Port Stephens and Sydney Harbour.

White's Seahorse occurs along the east coast of Australia, from north of Mackay in Queensland to Sussex Inlet in New South Wales. It is locally abundant in Port Stephens and Sydney Harbour.

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 coastal embayments and estuaries, from about 1 to 18 m deep. Important habitats include seagrass meadows, sponges, soft corals and gorgonians, as well as structures such as jetty pylons and swimming-net enclosures.

It occurs in coastal embayments and estuaries, from about 1 to 18 m deep. Important habitats include seagrass meadows, sponges, soft corals and gorgonians, as well as structures such as jetty pylons and swimming-net enclosures.

Foraging habitat: Diet

It feeds on small crustaceans, including copepods, amphipods, shrimp and mysids.

It feeds on small crustaceans, including copepods, amphipods, shrimp and mysids.

Breeding habitat: Breeding

Females transfer eggs into the male's brood pouch, where they are fertilised and protected until the male gives birth to live young.

Females transfer eggs into the male's brood pouch, where they are fertilised and protected until the male gives birth to live young.

Sheltering habitat: Shelter

Not documented in the published sources used for this profile.

Not documented in the published sources used for this profile.

Threats: Threats

Habitat loss and degradation, including impacts on soft corals and seagrasses, threaten the species. Disturbance or loss of key habitats may affect its abundance and distribution.

Habitat loss and degradation, including impacts on soft corals and seagrasses, threaten the species. Disturbance or loss of key habitats may affect its abundance and distribution.

Threats: Works risk

In-water works or development that remove, degrade or disturb seagrass, sponges, soft corals or other key habitat could harm the species. Impacts to artificial habitats it uses, such as jetty pylons and swimming-net enclosures, may also affect it.

Survey methodology: 1. Species-specific methods

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

Diver surveys have been used to monitor White's Seahorse at sites in New South Wales, including monthly surveys conducted from 2006 to 2009.

Survey methodology: 2. Commonwealth guidance

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: 3. 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

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

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

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

Plan in-water works, vessel movements and lighting to avoid known habitat and sensitive periods, and set observer and shutdown procedures before works start.

During disturbance: 1. Controls

Keep works inside the approved footprint and conditions.

Use spotters and exclusion zones for in-water works and vessels, and pause works if the species is seen within the zone.

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.

Remove temporary structures, restore natural flow and substrate, and monitor water quality until it returns to baseline.

Sources