Formulation of practical diets for rainbow trout (Salmo gairdneri) made by partial or complete substitution of fish meal by poultry by-products and certain plant by-products

TitleFormulation of practical diets for rainbow trout (Salmo gairdneri) made by partial or complete substitution of fish meal by poultry by-products and certain plant by-products
Publication TypeJournal Article
Year of Publication1985
AuthorsAlexis, MN, Papaparaskeva-Papoutsoglou E, Theochari V
JournalAquaculture
Volume50
Issue1-2
Pages61 - 73
Abstract

Rainbow trout of approximately 20 g initial average weight were fed seven experimental diets and a commercial diet for 197 days. All experimental diets had the same proximate composition and were formulated by partial or complete substitution of fish meal by poultry by-products in combination with certain plant by-products. The plant by-products were soybean meal, carob seed germ meal and corn gluten meal. Linseed oil was used in order to increase the fat content of the diets and to supply the indispensable fatty acids. Diets containing soybean meal and corn gluten meal gave the best results, comparable to those obtained with the commercial food. Results obtained from the diets containing carob seed germ meal were inferior, especially during the first 50 days of rearing. Haematological characteristics of all fish tested were within the normal values reported in the literature. Liver composition did not indicate any lipid or glycogen accumulation. The results of growth and food conversion are discussed in relation to the cost of production calculated for each diet. © 1985.

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