アワビの栄養に関する研究-II : 蛋白質要求量について

概要

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It was reported in the previous paper (this journal, 29, 691 (1963)) that the young abalone showed good responses of growth by feeding the artificial diet composed of calcium alginate-gel in which various nutrients were kept. In this paper, the protein requirements of abalone, Haliotis discus REEVE, were investigated by feeding the diets whose protein source was white fish meal (Table 1). The results of feeding trials are shown in Table 2 and Fig. 1. The diets were provided ad libitum throughout the experiments. The daily growth rates of abalone fed diets having protein levels from 20 to 30 percent were nearly constant in each experimental series and their values fell at the protein levels lower than 15 percent. The daily growth rates of abalone, however, increased considerably at the protein levels higher than 30 percent of the diet. From the present and previous results (Fig. 1) it was concluded that abalone required protein levels of about 20 percent in the artificial diet for the normal growth when the diet was provided ad libitum. The increases of the daily growth rate at higher protein levels may be attributable to the presence of unidentified growth factor(s) for abalone in the white fish meal, since there was no difference in amount of diet consumed among different groups.