Journal of Nutrition

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Journal of Nutrition Vol. 102 No. 1 January 1972, pp. 77-85
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Essential Fatty Acids in the Diet of Rainbow Trout (Salmo gairdneri): Growth, Feed Conversion and Some Gross Deficiency Symptoms1,2,3,

J. D. Castell4, R. O. Sinnhuber5, J. H. Wales and D. J. Lee

Department of Food Science and Technology, Oregon State University, Corvallis, Oregon 97331

Experiments are described to define further the fatty acid requirements of rainbow trout (Salmo gairdneri). In all cases, feeding semipurified diets containing no polyunsaturated fatty acids resulted in poor growth and feed conversion. Linolenic acid was superior to linoleic in stimulating growth and improving feed conversion. The requirement of linolenic acid ({omega}3 fatty acids) for rainbow trout is 1% of the diet or approximately 2.7% of the dietary calories. Essential fatty acid deficiency symptoms that were cured or prevented by linolenic acid included fin erosion, heart myopathy, and a shock syndrome. It is concluded that linolenic acid has an essential role in rainbow trout similar to that assigned to linoleic acid in man and higher animals.

KEY WORDS: • essential fatty acids • rainbow trout • metabolism • growth

1 Taken in part from a dissertation submitted to the Graduate School of Oregon State University by John D. Castell in partial fulfillment of the requirements for the degree of Doctor of Philosophy.

2 Supported in part by the National Oceanic and Atmospheric Administration Institutional Sea Grant GH 97.

3 Technical Paper no. 3071, Oregon Agricultural Experiment Station.

4 Present address: Fisheries Research Board of Canada, Halifax Laboratory, P. O. Box 429, Halifax, Nova Scotia.

5 Address reprint requests to: R. O. Sinnhuber, Department of Food Science and Technology, Oregon State University, Corvallis, Oregon 97331.

Manuscript received 16 April 1971.




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