Effects of Dietary Different Carotenoids Supplements on Pigmentation on the pearlscale goldfish, Carassius auratus

• Main Authors: Chia-Yu Chang, 張嘉育
• Other Authors: 廖文亮
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/44279348069105315207

碩士 === 國立臺灣大學 === 漁業科學研究所 === 101 === This study focused on the different kinds and concentrations of carotenoid in diet, for the effects of pigmentation of pearlscale goldfish (Carassius auratus), assessment of pigment metabolism, and raise fish pigmentation in the suitable amount. Experimental feeds are supplemented with two different carotenoid: zeaxanthin (hereinafter referred to as Z), synthesis astaxanthin (hereinafter referred as S). Experiment period was total 7 weeks, mean weight of pearlscale goldfish was about 2.69g. Experimental diets were divided into 9 groups: control, Z5, Z10, Z15, Z20, S5, S10, S15 and S20 (mg/kg diet). Fish skin were tested with tristimulus colorimeter, and further quantified for integument pigment. Results shows that the addition of carotenoids have no effects on growth and feed efficiency, but improve the pigmentation by enhanced a and b values in pearlscale goldfish. The coloration of both S groups and Z groups were increase by the raising of concentrations of carotenoid in diet. Therefore, we can say that synthesis astaxanthin is more effective than zeaxanthin in the addition of carotenoids in diets for pearlscale goldfish, and the optimal concentration is 15mg/kg diet.