军曹鱼稚鱼最适蛋白质和脂肪的含量  

Optimal Dietary Protein and Lipid Levels for Juvenile Cobia (Rachycentron canadum)

作　　者：王广军[1] 李霞[1] 

机构地区：[1]中国水产科学研究院珠江水产研究所,广东广州510380

出　　处：《水产科技》2003年第6期12-15,共4页

摘　　要：为了研究军曹鱼——一种极具发展潜力的适合在热带亚热带网箱养殖鱼类的饵料中最适蛋白质和脂肪的含量,进行了两期生长实验。在第1期的生长实验中,在以鱼粉为基础饵料中添加酪蛋白代替淀粉,使饵料形成含蛋白36-60%的梯度,7种饲料据估算是等能量的。经过8周的生长实验,投喂含44%、48%和52%蛋白质的几种饲料的稚鱼(实验开始时体重33g)的体重增长及饲料转化率均优于其他几组。多元回归分析结果表明,在44.5%蛋白质含量处,体重增长率达到顶峰,这被认为是最适合于稚鱼生长的饵料蛋白质水平。在第Ⅱ期生长实验中,给稚鱼投喂含脂肪3—18%的7种等氮和等能量的饵料,稚鱼(初始体重41g)的生长率在脂肪含量为3%时最低,随着饵料含脂量的升高,鱼体增重率逐渐升高,然后下降,采用折线回归分析结果表明,当脂肪含量达到5.76%时,鱼的生长达到一个转折点,超过这个转折点,一直到实验的最高浓度18%,鱼的生长情况变化不大。Two growth trials were conducted to investigate the optimal concentrations of dietary protein and lipid for cobia,a pelagic fish showing great potential for offshore cage culture in tropical and subrtopical waters.In the first trial,casein was added to a fish meal-based basal diet to replace starch to render protein concentration gradation ranging between 36% to 60%:All seven diets were estimated to be isoenergetic.After an 8-week growth trial,juvenile cobia(initial weight 33g)fed the diets containing protein coneentrations of 44%,48% and 52% generally attained higher wweight gain and feed conversion than the othergroups.Polynomial regression analysis revealed a weight gain peak at a dietary protein concentration of 44.5%,which is regarded as the most suitable level for maximum fish growth.In the second trial,the cobia were fed seven isonitrogenous and isoenergetic test didts containing lipid concentrations ranging from 3% to18%.Growthofthe fish(initial weight 41g)was lowest when the dietary lipid concentration was 3%.Weigh gain increased with increasing lipid in- clusion and then leveled off.The broken-line analysis that best expressed the response pattern shows a breakpoint when dietary lipid concentration was5.76%.No significant growth enhancement was observed when the lipid levels were increased beyond the breakpoint to the highest lipid concentration tested(18%).③2001 Elsevier Science B.V.All rights reserved.

关 键 词：军曹鱼 稚鱼 饵料 蛋白质 脂肪 最适含量 营养需求 

分 类 号：Q959.483[生物学—动物学] S965.399[农业科学—水产养殖]