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Effect of Dietary Lipids on Growth, Tissue Composition and Metabolism of the Oyster (Crassostrea virginica)¹

Fisheries and Environmental Sciences, Fisheries and Oceans Canada, Halifax Laboratory, P.O. Box 550, Halifax, Nova Scotia, Canada B3J 2S7

Hatchery reared oysters (Crassostrea virginica) were fed six different diets for 30 weeks. The diets contained cod liver oil (CLO), corn oil (CO), corn oil and cod liver oil (1:2) (CO + CLO), hyrogenated coconut oil (HCO), ethyl esters of cod liver oil fatty acids (SF) or cod liver oil ethyl esters supplemented with cholesterol (CH). Data on growth and tissue composition imply that oysters have an essential fatty acid (EFA) requirement for both linolenic or 3 and linoleic or ß series fatty acids, with the former playing a more significant role. The feeding study supported by a ¹⁴C-acetate metabolism experiment suggests that these oysters were unable to synthesize sterols and excessively high dietary sterol (1% of the dry weight of the diet) inhibited growth.

KEY WORDS: • oysters • fatty acids • sterols

¹ This study formed part of the research done by D. J. Trider for a Master of Science degree in Biology at Dalhousie University. Halifax, Nova Scotia. The research was supported by a Fisheries Research Board of Canada Grant in aid of Research.

Manuscript received 30 April 1979.