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Torrentfish
The torrentfish, ''Cheimarrichthys fosteri'', is an amphidromous freshwater fish that is endemic to New Zealand. Torrentfish are well adapted to life in shallow, fast-flowing riffles and rapids. They grow to a maximum of in total length, but more commonly reach .
==Description==
Torrentfish are stocky, with a flattened underside, arched back and a broad, downward-tapering head with eyes set high.〔 The lower jaw is very undercut and is surrounded by a fleshy upper lip〔 – an adaptation for picking invertebrates off the surface of stones. The fins are very robust.〔 The pectoral fins are very large and triangular, angled so that water flowing over them depresses the fish against the substrate, helping them to stay in position in fast-flowing water. The pelvic fins are set underneath the head. The dorsal and anal fins are very long-based, with the dorsal fin extending for nearly half of the body length.〔 The tail fin is short and truncated or slightly forked, suited to sudden burst swimming rather than sustained swimming.〔
All torrentfish have a similar pattern of five dark stripes on a lighter background.〔 There are three stripes on the body, generally angled downwards towards the head, with a fourth stripe vertically at the base of the tail and a fifth passing through the eyes and angling downwards towards the base of the pectoral fin. Their colouration is either dark grey on a lighter grey background, or dark brown on a lighter brown background, changing according to the surroundings of the fish.〔 These patterns and colouration camouflage the torrentfish and help it to blend in with its stony habitat.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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