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Galaxias pedderensis

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA CHORDATA ACTINOPTERYGII OSMERIFORMES GALAXIIDAE

Scientific Name: Galaxias pedderensis
Species Authority: Frankenberg, 1968
Common Name/s:
English Pedder Galaxias

Assessment Information [top]

Red List Category & Criteria: Critically Endangered A1ac+2c, B1+2abcde ver 2.3
Year Published: 1996
Date Assessed: 1996-08-01
Annotations:
Needs updating
Assessor/s: Wager, R.
Justification:
This assessment of this species was based on the original natural population in the Lake Pedder area which was under severe decline (see threats) at the time the assesssment was done. It has since gone extinct in its original habitat, but was fortunately successfully introduced (a benign introduction) to Lake Oberon and at another site. The status of the species needs to be reassessed using information from the introduced populations.

The documentation in this account was derived from the Environment Australia SpeciesBank web site (Environment Australia 2007).
History:
1994 Endangered (Groombridge 1994)
1990 Vulnerable (IUCN 1990)
1988 Vulnerable (IUCN Conservation Monitoring Centre 1988)

Geographic Range [top]

Range Description: The Pedder Galaxias previously occurred only in Lake Pedder and its tributaries and surrounding swamps in Tasmania. It is no longer found within its native range. Since 1996 its distribution has been limited to a remote highland lake in south-west Tasmania (Lake Oberon), where it was introduced (a benign introduction) in a successful attempt to rescue the species from extinction.
Countries:
Native:
Australia (Tasmania)
Range Map: Click here to open the map viewer and explore range.

Habitat and Ecology [top]

Habitat and Ecology: The Pedder Galaxias lives in the ea-coloured water of lakes and streams. The last known natural habitat occupied was slow-flowing meandering sections of tributaries to the Lake Pedder impoundment. Pools with roots and overhanging banks providing shelter were preferred. The Pedder Galaxias live for 5 to 6 years. They breed once a year in spring and females produce up to 1,200 large eggs that are about 2.5 mm in diameter. Eggs are laid under rocks, plants and wood. The Pedder Galaxias feed mainly on terrestrial and aquatic insects and crustaceans.
Systems: Freshwater

Threats [top]

Major Threat(s): They declined rapidly from the late 1970s due to destruction of habitat by the flooding of Lake Pedder for a hydro-electric scheme. At the same time, predatory brown trout were introduced for recreational fishing. Since the flooding, another aggressive competitor, the native climbing galaxias, which did not previously occur in Lake Pedder, has also become abundant. Pedder Galaxias were last seen in their remaining natural habitat in 1996. Their survival in their introduced places depends on keeping their habitats free of introduced fish species.

Conservation Actions [top]

Conservation Actions: Between 1991 and 1992, to save the species, 31 fish were moved into Lake Oberon, a remote fish-free lake in south-west Tasmania. The Pedder Galaxias are thriving in this new habitat and in 2001 some were moved to a second artificial habitat.
Citation: Wager, R. 1996. Galaxias pedderensis. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <www.iucnredlist.org>. Downloaded on 16 April 2014.
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