الفهرس 
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Abstract
Fish as a group are fundamentally different from other vertebrates in that they require more dietary protein.
(Cowey and Sargent 1979; Cowey and Luquent 1983: Wilson and Halver 1986) (1-3).
Mammals and birds specially achieve maximum growth rate on diets containing 2-25% protein, whereas fish require diets with 35-55% protein to reach maximum growth rate, (Rumsey 1981) (4)
The relatively
higher protein concentration required by fishes may be higher because (1) fishes need more protein for growth (2) fishes require less of some other diet component and (3) if fish can not use carbohydrate and do not for some reason use enough lipid for metabolic energy, then they necessarily depend on protein as a source of metabolic energy (Bowen, 1987) (5) Halver et al (1957) (6) reported that arginine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, thronine. tryptophan
indispensable for the growth of
(Onchorhynchus tshawytscha).
and valine are chinook salmon,
On diets deficient in any one of these amino acids, curbed intake of food was noted in ten days. The fish would swim slowly to the surface, take a piece of food, mouth it and.