| Climbing galaxias | ||||||||||||||||
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| Galaxias brevipinnis Günther, 1866 |
The Climbing galaxias, Galaxias brevipinnis, is a Galaxiid of the fish genus Galaxias found in Australia, New Zealand and nearby islands. The Galaxiids are a family of mostly small freshwater Fish. Representatives occur throughout the southern hemisphere including South Africa, South America For a topic outline on this subject see List of basic Australia topics. New Zealand is an Island country in the south-western Pacific Ocean comprising two main landmasses (the North Island and the South Island
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Common names
- Koaro (by the Māoris in New Zealand)
- Climbing galaxias
- Short-finned galaxias
- Broad-finned galaxias
- Cox's mountain galaxias
- Pieman galaxias. This article discusses the Māori people of New Zealand For their language see Māori language, and for other meanings see Māori (disambiguation.
Appearance
The climbing galaxias is unlikely to be confused with the other diadromous whitebait species because of its shape. Many types of fish undertake migrations on a regular basis on time scales ranging from daily to annual and with distances ranging from a few meters to thousands of kilometers This article is concerned with whitebait as the juvenile of various species of fish around the world for other uses of the term see Whitebait (disambiguation. It is elongate and slender, shaped almost like a tube. The sides and back are covered in a variable pattern of golden blotches and bands that gleam and glitter in the sun, making the climbing galaxias a very attractive fish indeed.
Lifestyle
These fish live a basically benthic lifestyle and in most respects behave like the common galaxias, a closely related galaxiid. The benthic zone is the ecological region at the lowest level of a Body of water such as an Ocean or a Lake, including the sediment surface and some sub-surface The common galaxias, Galaxias maculatus, is a species of fish from the Galaxiid family that is very widespread in the Southern hemisphere. They inhabit mainly clear streams, often deeply shaded and relatively fast-flowing, although it sometimes occurs in lakes, particularly in Tasmania. Climbing galaxias also have the ability to penetrate well inland in many river systems, and thus have a more widespread distribution than the other whitebait species.
A major distinguishing feature of this species is its ability to climb up very steep surfaces such as waterfalls, wet rocks and the sluices of hydro dams, and this gives rise to one of its common names. Even juveniles of the species are capable of climbing up and over the sides of buckets after being trapped in whitebait nets.
Climbing ability is not unique among galaxias species, but it reaches its greatest expression in the Climbing galaxias which have special features that enhance their climbing abilities. The downward orientation of their fins and the strong, backward-facing ridges on the front part of their fins possibly contribute to this ability.
Lifecycle
G. brevipinnis eggs are believed to be washed downstream to the sea where the young live for about 6 months before returning to freshwater as part of the large mixed species schools known as whitebait. This article is concerned with whitebait as the juvenile of various species of fish around the world for other uses of the term see Whitebait (disambiguation. They were once part of a commercial whitebait fishery in Tasmania, but now fishing for them has been restricted to recreational anglers with significant restrictions on allowable tackle and methods. Land-locked populations have a similar lifestyle except that the young spend the first part of their life in inland lakes and backwaters etc.
Diet
These fish are generalised carnivores of invertebrates including aquatic and terrestrial insects, mayfly, caddisfly larvae, and amphipods. An invertebrate is an Animal lacking a Vertebral column. The group includes 98% of all animal Species — all animals except those in the Chordate Insects ( Class Insecta) are a major group of Arthropods and the most diverse group of Animals on the Earth with over a million described Mayflies are Insects which belong to the Order Ephemeroptera (from the Greek ephemeros = "short-lived" pteron Caddisflies, sedge-flies or rail flies (Order Trichoptera, from Greek trich, "hair" and ptera, "wings" In Roman mythology, the larvae or lemures (singular lemur) were the spectres or spirits of the dead they were the malignant version of the Amphipoda (amphipods are an order of animals that includes over 7000 described Species of Shrimp -like Crustaceans ranging from 1 mm to 140 mm
Distribution
Their distribution extends to coastal streams in south-eastern Australia from Adelaide and Kangaroo Island in South Australia, through coastal Victoria including Wilson's Promontory, Tasmania, Flinders & King Islands and up the New South Wales coast to around Sydney, as well as New Zealand including the Chatham, Auckland and Campbell Islands. Adelaide is the capital and most populous city of the Australian state of South Australia, and is the fifth largest city in Australia with a Kangaroo Island is Australia 's third largest Island - after Tasmania and Melville Island. South Australia is a state of Australia in the southern central part of the country Wilsons Promontory is a Peninsula that forms the southernmost part of the Australian mainland and is located at. Tasmania is an Australian island and state of the same name It is located south of the eastern side of the Continent, being separated from it by Bass Flinders Island is an island in the Bass Strait, located 20 km from Cape Portland being the north-eastern tip of Tasmania, Australia King Island is one of the islands that make up the state of Tasmania, Australia. Sydney (ˈsɪdniː is the most populous city in Australia, with a Metropolitan area population of approximately 4 New Zealand is an Island country in the south-western Pacific Ocean comprising two main landmasses (the North Island and the South Island The Archipelago of the Chatham Islands ( Rekohu in the Moriori language and Wharekauri in the Māori language) is a territory The Auckland Islands ( Motu Maha) ( form an archipelago of the New Zealand Sub-Antarctic Islands and include the following Auckland Island, Adams The Campbell Island group (or Campbell Islands) is a group of Sub-Antarctic Islands belonging to New Zealand.
External links
- "Galaxias brevipinnis". FishBase. FishBase is a comprehensive Database of information about Fish. Ed. Ranier Froese and Daniel Pauly. March 2006 version. N. p. : FishBase, 2006.
- NIWA June 2006
- Native Fish Australia
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