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Identification of Brook, Brown, Rainbow, and Cutthroat Trout Larvae
Author(s) -
Martinez Anita M.
Publication year - 1984
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1984)113<252:iobbra>2.0.co;2
Subject(s) - salmo , brown trout , biology , rainbow trout , dorsal fin , trout , salvelinus , zoology , meristics , fish fin , anatomy , fishery , fish <actinopterygii>
Cultured metalarvae and mesolarvae of brook trout Salvelinus fontinalis, brown trout Salmo trutta, rainbow trout Salmo gairdneri, and cutthroat trout Salmo clarki were analyzed for distinguishing pigmentation patterns, variation in size and abundance of oil globules in the yolk, and differences in 48 morphometric and meristic characters by comparison of percent standard lengths and multivariate statistical techniques. Rainbow and cutthroat trouts differed from each other only in that the insertion of the dorsal fin and origin of the adipose fin were more posterior in rainbow trout. Brown trout differed from the other species in having longer pectoral fins, an elliptical yolk and unique pigmentation on the lower jaw, caudal fin, and adipose fin. Brook trout differed from the other species by having numerous minute oil globules in the yolk; a distinctively longer adipose fin; prominent pigmentation on the anterior margin of the mandible, caudal fin, and adipose fin; and a greater number of dorsal and ventral parr marks. Brown and brook trout metalarvae had unilobed preanal finfolds, whereas rainbow and cutthroat trout metalarvae had bilobed preanal finfolds. Each of the species was clustered into a distinct group by discriminant‐function analysis, but principal‐component analysis was inadequate for complete separation of these species.