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Total lipid and lipid class composition of selected tissues and serum were determined for juvenile steelhead trout Sulmo guirdneri, during the smolting period between 25 January and 19 April 1982. The total lipid content ofthe serum, liver, light muscle and dark muscle was significantly depleted during smolt transformation. Mesenteric fat total lipid concentration fluctuated little over the sampling period. Phospholipids of muscle and mesenteric fat exhibited little seasonality. Cholesterol was significantly depleted from dark muscle and liver. Large stores of triacylglycerol (TGL) in the parrs' mesenteric fat, dark muscle and liver implicate these tissues as lipid depot organs. In those tissues depleted of lipid, TGL concentrations were reduced more than any other lipid class. This supports the hypothesis that increased catabolism is the cause of loss of body fat during salmonid smolt transformation.

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AurN, W. V, 1971. Amino acid and fatty acid composition of tissues of the Dungeness ctab (Cancer magister). J. Fish. Res. Bd. Canada 28: 119l-1195Tissues of the Dungeness crab (Cancer magister Dana) were analyzed for content of total lipid, protein, amino acids, fatty acids, and glucosamine. Ovaries and hepatopancreas were the major lipid storage organs. Gonads (ovaries and testes) and skeletal muscle contained substantially more protein than the other tissues, A11 tissues except the exoskeleton had balanced amino acid compositions. The exoskeletal protein was deficient in arginine and lysine. Glucosamine was a prominent constituent of the exoskeleton and of the gills and the gastric apparatus. Palmitic, palmitoleic, oleic, eicosapentaenoic, and docosahexaenoic acids were the major fatty acids found in all tissues.J. Fish. Res. Bd. Can. Downloaded from www.nrcresearchpress.com by University of Sydney on 09/19/13For personal use only.