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Percopsis omiscomaycus
''Percopsis omiscomaycus'' also known as the trout-perch, the grounder or the sand minnow, is one of two species in the family Percopsidae. They are freshwater fish that prefers clear to slightly turbid water. They are most often seen washed up on beaches and are rarely seen alive or correctly identified. They are found in rivers and lakes throughout North America.〔Bosanko, Dave (2007), "Fish of Minnesota – Field Guide", pp. 162–163, Adventure Publication, Cambridge, MN. ISBN 1-591-93192-4〕 Its name comes from the Greek root words ''perc'', meaning perch and ''opsi'' meaning appearance. The species name ''omiscomaycus'' is thought to be derived from a Native American word meaning ''trout''. The trout-perch possess characteristics similar to both the trout and the perch.〔Bramblett, Robert, "Montana Cooperative Fishery Research Unit", Department of Ecology, Montana State University-Bozeman.http://www.fisheriessociety.org/AFSmontana/SSCpages/Trout-perch.htm〕 They are an important source of food for many predator fish such as walleye, northern pike, and lake trout. They are a generally small fish found in deep waters by day, but which migrate to shallower waters at night. They are not a major human fishery, but are occasionally used as a bait fish.〔
==Description==
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The trout-perch has been found at sizes of total length (TL) but the average total length is . There are no distinguishing characteristics between males and females. They are overall silvery or nearly transparent in appearance with rows of dark spots on along the sides of their bodies both along their lateral line and above it.〔 Their fins are almost entirely transparent. These fish have thick bodies with a long head, long snout, and a small mouth.〔 They have a single dorsal fin containing 1–3 spines and 10–11 soft rays. They also have an adipose fin, similar to trout, which helps to distinguishes them from their look-alike species, the yellow perch and the walleye.〔 Their tail or caudal fin is forked. Like most bony fishes, the trout-perch has thin, flexible plates of bone or leptoid scales. Their particular leptoid scales are ctenoid scales that are similar to the perch's.
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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