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Influence of Dietary Lipid on Lipogenic Enzyme Activities in Coho Salmon, Oncorhynchus kisutch (Walbaum)¹

Departments of Fisheries and Wildlife and Food Science and Human Nutrition, Michigan State University, East Lansing, Michigan 48824

Coho salmon (Oncorhynchus kisutch), 8 to 18 months of age, were maintained in culture tanks and were fed three semipurified diets. The diets contained 40% of energy from protein and 11.5%, 23%, or 46% of energy from lipid. The body weight gain and food conversion factors were similar among groups of fish fed the diets in each of the three experiments. Wet weight of mesenteric adipose tissue increased with increased amount of lipid in the diet; however, epaxial muscle lipid content was not influenced by the lipid content of the diet. Several hepatic and adipose tissue lipogenic enzymes (fatty acid synthetase, citrate cleavage enzyme, malic enzyme, glucose-6-phosphate dehydrogenase, 6-phosphogluconate dehydrogenase, and NADP-isocitrate dehydrogenase) were assayed. These lipogenic enzymes exhibited high activities in liver and relatively low concentration in adipose tissue of the fish. The activities of all the hepatic lipogenic enzymes assayed, except for NADP-isocitrate dehydrogenase, were depressed as the level of lipid in the diet was increased; however, the activities of these enzymes in mesenteric adipose tissue were not influenced by the diets fed. The results of this study indicate that dietary lipid depresses hepatic lipogenic enzyme activities and that the liver may be a more important site for fatty acid synthesis than is adipose tissue in coho salmon.

KEY WORDS: • lipogenic enzymes • dietary fat • liver • adipose tissue • coho salmon

¹ Supported in part by NIH AM 18957. DRR is the recipient of a Research Career Development Awar NIH K04 AM 00112. Michigan Agricultural Experiment Station Journal Article No. 7837.

Manuscript received 5 October 1976.