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Journal of Nutrition Vol. 106 No. 8 August 1976, pp. 1159-1165
Copyright © 1976 by American Society for Nutrition
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Dietary Lipid Requirements of Adult Lobsters, Homarus americanus (M.E.)

John D. Castell and Jane F. Covey

Department of the Environment, Fisheries and Marine Service, Halifax Laboratory, P.O. Box 429, Halifax, Nova Scotia B3J 2R3

The effects of several dietary lipids on adult American lobster (Homarus americanus) were assessed over a 10 month feeding period. Cod liver oil (CLO) resulted in greater percent weight gains, feed conversion, percent edible meat and higher serum protein and hemocyte counts than either corn oil (CO) or hydrogenated coconut oil (HCO). These differences were probably due to an essential fatty acid (EFA) requirement by the lobster for linolenic series {omega}3 or other fatty acids present in CLO. The linoleic or {omega}6 fatty acids of CO appeared to have some sparing effect on several of the EFA deficiency symptoms. It was found that 5% CLO was optimal for mean percent weight gain, molt incidence, feed conversion and hemocyte counts of lobsters. Further increases in dietary CLO to 10% and 15% resulted in no significant improvement of any of the condition indices used. There was a decrease in serum protein and calcium when lobsters were fed a non-saponifiable sterol deficient diet. The addition of 1% cholesterol to the diet raised the serum protein, but resulted in even a greater decrease in the serum calcium level.

KEY WORDS: • essential fatty acid • serum protein • linolenic acid • linoleic acid • cod liver oil • corn oil • hydrogenated coconut oil • lobsters

Manuscript received 17 December 1975.




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