Pedder galaxias
| Pedder galaxias | |
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| File:Galaxias pedderensis.png | |
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G. pedderensis
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| Binomial name | |
| Galaxias pedderensis Frankenberg, 1968
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Pedder galaxias (Galaxias pedderensis) is a critically endangered Australian freshwater fish. It is considered to be extinct in the wild and was originally found only in Lake Pedder in Tasmania.
Contents
Range
Originally recorded only in Lake Pedder and inflowing streams, after the construction of the Huon-Serpentine dam in 1972 (the "new" Lake Pedder), its range expanded initially into Lake Gordon and Wedge River. However, by 1980 it had become very rare and no new specimens have been captured in the wild since 1996. Introduced trout are implicated as a major factor in the decline of this species. The species survives in two translocated populations outside its original range, one at Lake Oberon in the Western Arthurs mountain range and one at a modified water supply dam near Strathgordon. [1]
Description
A small greenish-brown fish, off-white to silvery belly, a profuse irregular and highly variable pattern of alternating off-white and brownish contrasting bands extending into the base of the fins and breaking up into fine spots on the lowerr part of the sides. Length to 160 mm.
Habitat
Before the construction of the new lake, this species preferred Lake Pedder itself which was quite shallow surrounded by white sandy beaches and small rooted aquatic vegetation as well as in swamps and low velocity waters with abundant instream organic debris and overhanging terrestrial vegetation.
Diet consists of small invertebrates, particularly arthropods and aquatic insect larvae, crustaceans and terretrial insects especially beetles, flies, cicadas etc.
Conservation status
- Critically endangered on IUCN Red List (last assessed in 1996).
- Extinct in the wild status for the EPBC Act since 2005.
Reproduction
Females are larger than males. Male genital papilla narrow, whereas female are broad and rounded, most noticeable during breeding season. 150 to 1,200 eggs averaging 1.9 mm to 2.3 mm in diameter when water hardened. Spawning reported to occur in spring (October) at water temperatures of 6.7 to 7.5°C.
References
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- Australian Department of the Environment and Heritage (2006). Galaxias pedderensis in Species Profile and Threats Database, Department of the Environment and Heritage, Canberra.
- IUCN Red List
- Fishbase
