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Mudfish have the ability to aestivate during droughts, seeking out moist areas under logs and vegetation so they do not dry out. While emersed (out of the water), they respire through cutaneous respiration , either through their skin, or by taking mouthfuls of air.
The bowfin (Amia calva) is a ray-finned fish native to North America. Common names include mudfish, mud pike, dogfish, grindle, grinnel, swamp trout, and choupique.It is regarded as a relict, being one of only two surviving species of the Halecomorphi, a group of fish that first appeared during the Early Triassic, around 250 million years ago.
The brown mudfish (Neochanna apoda) is a galaxiid endemic to New Zealand. The species is found in wetlands in the southwest of the North Island and the northern half of the west coast of the South Island. It commonly grows to 100–130 mm in length, and it can live to at least 7 years. They are named for their brown color.
The Canterbury mudfish is tubular and flexible, with small but fleshy fins. [6] The head is small and blunt, with small eyes and mouth and small tubular nostrils. [6] Like the Chatham mudfish, the Canterbury mudfish retains very small pelvic fins, which are absent in the other three mainland New Zealand Neochanna.
Tasmanian mudfish are smaller than other species comprising the whitebait fishery, generally only 30 to 40 mm at this age. The juvenile fish migrate upstream to their usual habitat. Nocturnal in habit and secretive in nature, the fish usually rest during daylight in heavy vegetation or half buried in the muddy substrate.
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The waikaka or black mudfish (Neochanna diversus) is a fish of the family Galaxiidae, [1] found only in swamps and wetlands in the northern half of the North Island of New Zealand, from Kaitaia in the north to the Mōkau River in the south.