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Individual Tissue Weight to Total Body Weight Relationships and Total, Polar, and Nonpolar Lipids in Tissues of Hatchery Lake Trout
Author(s) -
Hoffman Alex D.,
Jenson Correne T.,
Lien Gregory J.,
McKim James M.
Publication year - 1999
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(1999)128<0178:itwttb>2.0.co;2
Subject(s) - trout , salvelinus , biology , muscle tissue , body weight , hatchery , zoology , anatomy , endocrinology , fishery , fish <actinopterygii>
Abstract Individual tissue or organ weight to total body weight relationships, total lipid, and major lipid subclasses were measured in 3‐ and 4‐year‐old hatchery‐reared Lake Superior Isle Royale strain “lean” lake trout Salvelinus namaycush to obtain a more in‐depth understanding of the major lipid compartments of lake trout for use in predicting the distribution and disposition of xenobiotics in these fish. No significant ( P > 0.05) differences between males and females were observed in individual tissue or organ weight to total body weight relationships. The weight of internal organs and tissues made up approximately 11% of body weight, while the remaining carcass accounted for 85%. Muscle accounted for slightly more than half of the carcass weight. Dorsal and ventral muscle were approximately equal in proportions. Mean (±SD) calculated whole‐body total lipid for the lake trout was 15.2% (±2.2%). No significant ( P > 0.05) differences between males and females were observed in total lipid content or in the major lipid subclasses (polar, nonpolar) for the individual tissues and organs of the lake trout except for gonads. The total lipids in lake trout blood, tissues, and organs, ranked from highest to lowest, were viscera (48%), liver (15%), kidney (14%), carcass (12%), skin (10%), brain (8%), dorsal muscle (5%), gonads (4%), and blood (1%). Total lipid content of ventral muscle (12%) was more than two times that of the dorsal muscle (5%). Analysis of lipid subclasses showed lake trout tissues and organs had significantly higher (up to eight times higher for kidney) levels of nonpolar lipids than polar lipids.