The Clarence galaxias (Galaxias johnstoni) is a species of ray-finned fish in the family Galaxiidae endemic to Tasmania.
| Clarence galaxias | |
|---|---|
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Galaxiiformes |
| Family: | Galaxiidae |
| Genus: | Galaxias |
| Species: | G. johnstoni
|
| Binomial name | |
| Galaxias johnstoni E. O. G. Scott, 1936
| |
Description
editThe Clarence galaxias is scaleless and has a dark brown back with brown bars and bands extending down its sides, while the belly is a lighter yellow-cream color. Adults reach a body length of 12.5–14 cm and a maximum weight of 20 g.[2][3]
Distribution and habitat
editThe Clarence galaxias is a freshwater species and inhabits lakes as well as swamps and streams connected to lakes.[3] It is endemic to Tasmania's Derwent River catchment, including the Clarence Lagoon. Only seven breeding populations are currently known.[2]
Conservation
editWhile locally common, the species has been classified as endangered by the IUCN.[1] It is under pressure from predation and competition from introduced brown trout and rainbow trout.[2]
Behavior
editThis Galaxia is an ambush predator. They burrow or find a lair to predate from. Unless food is bountiful they show vigor and are aggressive during feeding .They tend to perch themselves on top of structures such as rocks using their pectoral fins regularly. They are more active during the evening. The foods observed eaten are only live foods such as nymphs, mosquito larve, and brine shrimp. Blood worms are an exception and also eaten frozen. Upon further observation, they clunkily get around swimming, turning their body they seem stiff in the mid section. They have tremendous strength relative to size with a thick front section, large gaping jaw and large fan like fins.
References
edit- ^ a b Freeman, R. (2019). "Galaxias johnstoni". IUCN Red List of Threatened Species. 2019: e.T8806A129040727. doi:10.2305/IUCN.UK.2019-3.RLTS.T8806A129040727.en. Retrieved 14 November 2021.
- ^ a b c Jean Jackson; David Crook (2002). "Clarence galaxias - Galaxias johnstoni" (PDF). ASFB Newsletter. 32 (1). Australian Society for Fish Biology. Archived from the original (PDF) on 2016-03-04. Retrieved 2015-08-17.
- ^ a b "Galaxias johnstoni". Fish Base. Retrieved 9 February 2013.
