Supplemental Effect of the Whole Body Krill Meal and the Non-muscle Krill Meal of Euphausia superba in Fish Diet

Abstract

In order to find an effective use of the Antarctic krill Euphausia superba meal, the study was conducted to examine the nutritional quality and the growth promoting effect of the whole body krill meal and the non-muscle krill meal as supplement in the diets of red sea bream Chrysophrys major, Japanese eel Anguilla japonica, and gray mullet Mugil cephalus. The feeding experiments were carried out with test diets supplemented with 5 %, 10% and 20% of the whole body krill meal and the non-muscle krill meal. The results showed that the high percentages of the whole body krill meal in the diet resulted in the increments of the body weight which were not significantly different from 5% non-muscle krill meal diet. Hence the non-muscle krill meal had a superior value for fish growth than the whole body krill meal. It is postulated that some factors that promote growth are present predominantly in the non-muscle krill meal. Accordingly chemical analyses such as general composition, amino acid composition and mineral composition of the krill meals and the white fish meal were conducted, however, noticeable difference could not be found between the two krill meals. © 1984, The Japanese Society of Fisheries Science. All rights reserved.