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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 ...
The majority of Australian freshwater fishes are poorly understood and are under threat due to human activities such clearing of riparian vegetation and siltation associated with agricultural practices, snag removal, overfishing, river regulation through dams and weirs, introduced fish and diseases. Two native fish populations that may have ...
Gambusia holbrooki has been implicated in the decline of at least 9 fish and 10 native frog species. [7] By consuming algae-eating zooplankton, they increase the chances of algae blooms in the water, reducing the water quality. They are very aggressive, and tend to attack other fish and nip their fins, leading to infection or death. [8]
Mosquitofish in Australia are classified as a noxious pest and may have exacerbated the mosquito problem in many areas by outcompeting native invertebrate predators of mosquito larvae. Several counties in California distribute mosquitofish at no charge to residents with human-made fish ponds and pools as part of their mosquito abatement programs.
Murray cod are very long-lived, which is characteristic of many freshwater native fish in Australia. [7] Longevity is a survival strategy in variable Australian environment to ensure that most adults participate in at least one exceptional spawning and recruitment event, which are often linked to unusually wet La Niña years and may only occur ...
Australian lungfish are commonly found in deep pools of 3–10 m (9.8–32.8 ft) depth [14] and live in small groups under submerged logs, in dense banks of aquatic macrophytes, or in underwater caves formed by soil being washed away under tree roots on river banks. The lungfish is tolerant of cold, but prefers waters with temperatures in the ...
The western galaxias is a fast-swimming schooling fish and often forms shoals just above the substrate in the shallows. It is often found in and around submerged vegetation in rocky pools at the base of rapids and waterfalls. At the beginning of the wet season it moves upstream to small streams where it spawns among vegetation in flooded areas.
The freshwater fish of Australia include approximately 280 species. Subcategories. This category has the following 6 subcategories, out of 6 total. ...