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Spotted galaxias has a very wide distribution, being found in southern Victoria, all of Tasmania, offshore islands in between, as well as south-west Western Australia.. On the mainland spotted galaxias is generally recognised as a freshwater fish species with a marine larval phase (larvae are swept out to sea and return to freshwater habitats as early stage juveniles), and thus only found in ...
Several species of trout were introduced to Australia and New Zealand by amateur fishing enthusiasts in the 19th century, effectively displacing and endangering several upland native fish species. The introduced species included brown trout from England and rainbow trout from California .
Introduced rainbow trout has now virtually eradicated the species from Lake TaupÅ. [5] Similarly, the introduction of brown trout eradicated a climbing galaxias population from Lake Tali Karng in Victoria, Australia (Cadwallader, 1996).
Freshwater galaxiid species are gravely threatened by exotic salmonid species, particularly trout species, which prey upon galaxiids and compete with them for food. Exotic salmonids have been recklessly introduced to many different land masses (e.g. Australia, New Zealand), with no thought as to impacts on native fish, or attempts to preserve ...
Introduced trout species dominate the upland reaches of rivers in southeast Australia, and may have negative effects on upland native fish like the mountain galaxias species, Macquarie perch and the unfortunately named trout cod, but due to their popularity as sport fish, lack of historical records, and loss of angling memories, their damaging ...
This is a breeding strategy similar to that used by introduced species of trout. Macquarie perch appear to have inherited the sexual dimorphism of other Macquaria species where females reach a larger maximum size than males. Females also reach sexual maturity at older, larger sizes than males.
For its land-size, Australia has a low diversity of native freshwater fish with only 281 described species. [1] This is largely because Australia is a very dry continent with sporadic rainfall and large areas of desert. There is a higher diversity of salt water fish. The most common freshwater fish are: Murray cod; Australian bass; Other ...
A chronic lack of alien-trout-free habitat reserved for galaxias, grayling and other native fish species in south-eastern Australia generally is a major concern. [ 6 ] [ 8 ] [ 7 ] Two Australian grayling were observed in the Glenelg River in south-western Victoria in early 2021, the first recorded sighting since 1899.