Becker, George C. / Fishes of Wisconsin
Trout family - salmonidae, pp. 287-375 ff. PDF (46.1 MB)
Trout Family- Salmonidae Nineteen species of trouts in five genera are known from Wisconsin. Of these, five species were established through the direct or indirect in- tervention of man. In the United States and Canada, 39 species in 7 gen- era are recognized (Robins et al. 1980). The salmonids are medium- to large-sized fishes, and all bear an adi- pose fin. If the mouth is large, it is well toothed; if small, almost tooth- less. The scales are cycloid. The body is scaled, the head scaleless, the lateral line present, and the pelvic axillary processes present. Pyloric caeca are well developed and numerous. Salmonids are freshwater fishes requiring low water temperatures. Some, like the Pacific salmon, are anadromous and move from large lakes up streams to spawn. The salmonids are among the most important sport and commercial fishes in the state and provide a greater return in dollar value from Lakes Michigan and Superior than any other family of fishes. Many of Wiscon- sin's inland lakes and streams have important populations of native sal- monids and, where conditions are suitable, additional waters have been converted into salmonid holdings through an extensive stocking pro- gram. The public views salmonids as elite fishes, surviving only in cold and clean water. The family is composed of three subfamilies, two of which are known from Wisconsin: Salmoninae (p. 288) and Coregoninae (p. 333). A third, Thymallinae (p. 288), is represented by a single species which was na- tive to Upper and Lower Michigan and in recent prehistory was prob- ably present in Wisconsin waters. 287
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