Optimal dietary protein, lipid and n-3 highly unsaturated fatty acid levels for red striped snapper, Lutjanus erythropterus

• Main Authors: Sheng-Lun Chou, 周聖倫
• Other Authors: Wen-Liang Liao
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/08613158601153134188

碩士 === 國立臺灣大學 === 漁業科學研究所 === 90 === The red striped snapper (Lutjanus erythropterus) is most likely developing as the main kind of cultured fish using the seawater net cage culture in Taiwan. Two feeding experiments were conducted to determine the suitable dietary protein, lipid and n-3 HUFA levels for fingerlings of red striped snapper by feeding them with two white fish meal diets containing different levels of protein (CP: 40~48%) and lipid (CL: 14~21%). In Experiment I, six groups of fingerlings (2 replicates/group, 12 fishes/replicate) were feed six diets with protein levels of 40% (L) or 46% (H), for a six-week period in tanks. In Diet-3 and Diet-6 were add separately 6.25 % and 3.5% of beef tallow into the feed to discuss the most suitable amount of beef tallow in the feed of the red striped snapper. After 42 days feeding, the weight gain and feed efficiency rate were 368 and 342%, 0.86 and 0.85 in Diet-1 (CP=41%, CL=21%) and Diet-4 (CP=46%, CL=18%), respectively. In Experiment II, seven groups of fingerlings (2 replicates/group, 25 fishes/replicate) were feed seven diets with protein levels of 42% (L) or 48% (H), for a six-week period in net cages. After 42 days feeding, the best weight gain and feed efficiency rate were 974% and 0.84 in Diet-1 (CP=42%, Fish oil=15%, 3.5% n-3 HUFA). These results indicates that the suitable protein, lipid and n-3 HUFA levels of red striped snapper were 42%, 21% and 1.9%, respectively, depends on weight gain, feed efficiency rate, muscle polar lipid and liver polar lipid. For the red striped snapper, in 21% diet lipid can use 10% beef tallow to replace fish oil.