우렁쉥이 껍질성분의 이용에 관한 연구 -2. 무지개송어 육색 개선을 위한 우렁쉥이 껍질 추출물의 최적 첨가량- = Utilization of Ascidian(Halocynthia roretzi) Tunic -2. Optimum Level of Carotenoid Extracts from Ascidian Tunic for the Pigmentation of Rainbow Trout, Oncorhynchus mykiss-

다국어 초록 (Multilingual Abstract)

This study was designed to determine the optimum pigment concentration supplemented in diet and feeding periods on the pigmentation of rainbow trout(Oncorhynchus mykiss) by using acetone-extracts of ascidian tunic as a natural pigment source. The eight pigmented diets contained carotenoid of ascidian tunic extracts at concentrations of 0, 200, 400, 800, 1,600 and 3,200mg/kg of diet, carophyll pink at concentration of 800mg/kg and commercial diet. No difference in pigment concentration was found between the ascidian extracts group and the control group until 4 weeks, but the redness of muscle and integument in the 1,600, 3,200mg/kg diet and carophyll pink was increased in the dorsal and caudal areas of fish from 6 weeks of age. In the sensory panel test, fish fed the ascidian tunic extracts diet were similar to those fed the carophyll pink diet. The optimum concentration and feeding periods for pigmentation of rainbow trout was found to be ascidian tunic extracts of 1,600mg/kg diet for 8 weeks.