Dietary pantothenic acid requirement of juvenile abalone, Haliotisdiscus hannai Ino

摘要

Juvenile abalone, Haliotis discus hannai Ino, of 0.55 plus or minus 0.02 g in body weight, and 15.48 plus or minus 0.31 mm in shell length, were fed with six purified diets containing 0, 9.8, 19.8, 39.7, 79.4, 158.5 mg Ca-pantothenic acid/kg diet for 16 wk. The Ca-pantothenic acid was microbound with sodium alginate, and other water-soluble vitamins were encapsulated with sodium alginate, by an emulsion coacervation process, prior to supplementation in experimental diets. The dietary Ca-pantothenic acid concentration did not affect the body composition of abalone. Weight gain (WG), daily increment in shell length (DISL), and tissue pantothenic acid were significantly affected by dietary pantothenic acid. According to broken-line regression analysis, 21 mg Ca-pantothenic acid/kg diet was found to satisfy the maximum growth of abalone, whereas on the basis of the pantothenic acid concentration in the viscera and muscle of the experimental abalone, 24 and 26 mg Ca-pantothenic acid/kg diet were required, respectively. Hence, the optimum dietary Ca-pantothenic acid requirement for H. discus hannai Ino is estimated to be 26 mg/kg diet.