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Influence of Dietary Zinc on Cataracts in Rainbow Trout (Salmo gairdneri)¹

Tunison Laboratory of Fish Nutrition, U. S. Fish and Wildlife Service, 28 Gracie Road, Cortland, New York 13045

The purpose of this study was to determine the cause of lens cataracts in hatchery trout fed diets containing white fish meal. After preliminary investigations, three experiments were conducted with fry of rainbow trout (Salmo gairdneri) that were fed practical-type diets containing either 40% herring meal (control diet) or 40% white fish meal with and without various mineral supplements. In all experiments, the trout fed herring meal grew well and had normal lenses. Those fed the diet containing white fish meal without supplement grew slowly and developed bilateral cataracts determined by using a slit-lamp biomicroscope. The severity of cataracts was increased by supplementing the diet with a mixture of minerals (phosphates and carbonates of calcium, sodium and potassium). Cataracts were prevented, however, with supplemental Na2EDTA or zinc but not by supplements of manganese, copper, iron or various other minerals. The metabolic alterations responsible for the zinc-deficiency cataract were not determined.

KEY WORDS: • zinc • cataracts • trout • white fish meal • fish

¹ A preliminary paper was presented at the Annual Meeting of the American Institute of Nutrition, Federation of American Societies for Experimental Biology. Atlantic City, N.J., April 1978. Ketola, H. G. Zinc prevents cataracts in trout. Federation Proc. 37, 584 (Abstr. 1950).

Manuscript received 10 October 1978.

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