ティラピアTilapia niloticaにおける飼料の適正タンパク質および可消化エネルギ-含量

概要

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This experiment was conducted to determine the relationship between dietary protein levels and feeding rates, apparent digestibility of nutrient and an optimum ratio of digestible energy (DE) to protein (P) in the diet by feeding Tilapia nilotica with diets containing various levels of DE and protein.The results showed that the optimum ratio of DE/P was 140-150, and that an optimum dietary protein level required for the maximum growth was 25%, when the feeding rate was 3.5% of fish body weight per day.Apparent digestibility of dietary protein, carbohydrate and lipid in Tilapia nilotica was higher than 90%. But, feed consumption together with apparent digestibility of carbohydrate was decreased with increase of dietary cellulose levels.The dietary DE for Tilapia calculated by using values of 4.5, 4.0 and 9.0 kcal/g for respectively protein, carbohydrate and lipid based upon digestibility of these nutrients'was found to be almost the same as those determined by the direct method.
日本水産學會の論文