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Native Fish of the Month: Tamar Goby and the Common Galaxias
The Native Fish Page contains information about some the different Native Fish that you may know about, or do not know about. All the information is being used with permission from Native Fish Australia (their link is on the Links Page), and the photographs have also been used with permission from Neil Armstrong.
Please do not use any of the information or photographs wihout permission!
Every month there will be two new 'Native Fish of the Month'
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Tamar Goby
Scientific Name
Afurcagobius tamarensis
Size
Commonly 80 mm, up to 110 mm
Conservation Status
Common
Habitat
Quiet parts of estuaries and lower sections of coastal streams. Prefers a silt or mud bottom.
Distribution
Estuaries and lower coastal streams of northern Tasmania and the south eastern part of the Australian mainland from eastern South Australia, through Victoria and New South Wales to the Queensland border.
Reproduction
Little studied, apparently breeds in spring.
Diet
Probably feeds on small burrowing invertebrates.
In the aquarium
An unusual aquarium fish, does best on live food and when provided with a fine sand or silt substrate. |
Common Galaxias
Scientific Name
Galaxias maculatus
Other Common Names
Common Jollytail, spotted minnow,
manga (New Zealand),
puyen (Chile and Argentina)
Size
Commonly 100 mm, up to 190 mm
Conservation Status
Widespread, common
Habitat
Tolerates a wide range of habitats, has a preference for still or slow moving waters. Able to withstand very high salinities well above that of sea water.
Distribution
In Australia the common galaxias is found in coastal rivers, lakes and streams at low altitudes from Adelaide in South Australia, through Victoria, Tasmania and the Bass Strait islands, New South Wales and Southern Queensland.
Also found in New Zealand, Lord Howe Island, the Chatham Islands, and Patagonian South America (Chile and Argentina) as well as the Falkland Islands. Probably the most widely naturally distributed freshwater fish in the world.
Reproduction
Spawns amongst terrestrial vegetation around river estuaries when under water at high tide. The eggs remain out of water for two weeks or more until a later group of spring tides. Most adults die after spawning. When the eggs are re-inundated they hatch and the larvea, which are about 7 mm long, migrate to sea. The young spend the Winter there and return to freshwater after about 5 to 6 months. The returning young fish are around 45-50 mm long, transparent and enter the rivers in huge shoals on the rising tide. Usually the fish reach maturity and spawn the following Autumn at 1 year of age. Occasionally females may delay maturity and spawning until the second or even the third year.
Diet
Carnivorous, feeding on a wide variety of small aquatic insects, crutaceans and molluscs as well as terrestrial insects especially chironomid (midge) larvae. Will take any small animal from the surface, mid water or the bottom.
In the aquarium
An easily kept, active aquarium species. However, females may become egg-bound during Austumn and may then die. High temperatures in Summer can also be a problem, but this can be overcome by freezing water in plastic drink bottles and floating them in the tank during the hot days.<
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