尼罗罗非鱼的形态性状对体重影响效果的分析  

Mathematical analysis of effects of morphological traits on body weight for tilapia Oreochromis niloticus

作　　者：唐瞻杨[1] 林勇[1] 陈忠[1] 唐章生[1] 李莉萍[1] 张永德[1] 曾兰[1] 甘西[1] 

机构地区：[1]广西水产研究所,广西南宁530021

出　　处：《大连水产学院学报》2010年第5期428-433,共6页Journal of Dalian Fisheries University

基　　金：国家科技支撑计划项目(2008BADB9B02);公益性行业(农业)科研专项(nyhyzX3-49);国家罗非鱼产业技术体系(nycytx-48);广西壮族自治区公益性科研院所专项基金资助项目(2060302)

摘　　要：随机选取1龄尼罗罗非鱼Oreochromis niloticus同批雌雄个体121尾,其中雌鱼57尾,雄鱼64尾,分别测量其体重(Y)及体长(X1)、头长(X2)、躯干长(X3)、体高(X4)、尾柄长(X5)、尾柄高(X6)、体宽(X7)等7项形态性状。采用相关分析和通径分析方法,以形态性状为自变量,体重为依变量,计算相关系数、通径系数和决定系数,并建立形态性状对体重的多元回归方程。结果表明:尼罗罗非鱼雌、雄鱼的7个形态性状与体重的相关性均达到极显著水平(P<0.01);影响雌鱼体重的主要性状为体长、体高、体宽和头长,影响雄鱼体重的主要性状为体高、体长、躯干长、和体宽;体长对雌鱼体重的决定系数最大(0.178),体高对雄鱼体重的决定系数最大(0.136)。经多元回归分析,选择偏回归系数显著的变量,与体重建立多元回归方程,尼罗罗非鱼雌雄鱼的形态性状与体重的多元回归方程分别为:Y雌=-443.542+16.525X1-17.106X2+40.658X4+56.038X7和Y雄=-684.921+15.531X1+25.413X3+38.976X4+48.213X7。The body weight（Y）,body length（X1）,head length（X2）,trunk length（X3）,body depth（X4）,caudal peduncle length（X5）,caudal peduncle depth（X6） and body width（X7） were measured in 57 female and 64 male 1-year old tilapia Oreochromis niloticus.The correlation analysis and path analysis revealed that the correlation coefficients of each morphological trait to body weight were all of very significant（P0.01）.The key effective factors of the body weight were found to be body length,body depth,body width and head length in female tilapia,while the body depth,body length,trunk length,and body width seemed to be the key effective factors of the body weight in the male.The females had the maximal determination coefficients of body length（0.178）for body weight,and the males showed the maximal determination coefficients of body depth（0.136）for body weight.There were very greater determination coefficients of body depth,body length and trunk length in male tilapia.The relationship between morphometric traits and body weight was expressed as Y=-443.542＋16.525X1-17.106X2＋40.658X4＋56.038X7 in the females and as Y=-684.921＋15.531X1＋25.413X3＋38.976X4＋48.213X7 in the males（P0.05）.

关 键 词：尼罗罗非鱼 形态性状 相关分析 通径分析 多元回归方程 

分 类 号：S965.125[农业科学—水产养殖]