Individual tissue weight to total body weight relationships and total, polar, and nonpolar lipids in tissues of hatchery lake trout

摘要

Individual tissue or organ weight to total body weight relationships, total lipid, and major lipid subclasses were measured in 10 male and 10 female lake trout (Salvelinus namaycush), 3-4 years of age. Fish were from the Lake Superior Isle Royale "lean" strain and were hatchery-reared. No significant 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 bodyweight, 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 calculated whole-body total lipid for the lake trout was 15.2±2.2%. No significant 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.