官井洋种群网箱养殖大黄鱼的形态特征与生长式型

The morphological characteristics and growth pattern of cage-cultured large yellow croaker(Larimichthys crocea) in Guanjing-Yang population

测定和研究了闽-粤东族官井洋种群养殖大黄鱼群体的形态特征与生长类型,并与文献报道的其亲本野生大黄鱼群体的形态特征进行了比较。结果表明：养殖大黄鱼的眼径/头长和体高/体长的比值普遍大于野生大黄鱼,而吻长/头长和眼后头长/头长的比值普遍小于野生大黄鱼。同时,养殖大黄鱼群体的眼径/头长、吻长/头长和头长/体长三项比值具有随着鱼体体长的增长而逐渐减小的特点。养殖大黄鱼体长与体重、体长生长与养殖时间的关系分别为：W=0.0195L^2.9775（R2=0.9959）、y=-0.0259x^2＋1.7125x＋4.1534（R^2=0.989）,鳔重与体重的比值为0.61%-2.26%,月平均鳔重指数1.08%-1.85%。

The large yellow croaker（Larimichthys crocea） is one of the most important and specific marine fish species in Asia,particularly in southeastern China.The fish farming developed quickly since 1980s as the result of successful artificial mass production.The present paper deals with the morphological characteristics and growth pattern of cultured large yellow croaker in Guanjing-Yang population.Compared with wild population,the proportion of eye diameter to head length,as well as the proportion of body height to standard body length of cultured population are larger.However,the proportions of snout length to head length and postorbital length to head length of cage-cultured population are smaller than that of the wild population.Furthermore,the results showed that the proportions of eye diameter to head length,snout length to head length and head length to standard body length of cultured population decreased as the sizes of the standard body length increased.The regression equations of body length and weight,body length and culture period,can be indicated as W=0.0195L^2.9775（R2=0.9959）,y=-0.0259x^2＋1.7125x＋4.1534（R^2=0.989）.The proportion of swim bladder weight to body weight is from 0.61% up to 2.26%,and the monthly average of swim bladder weight index is ranged from 1.08% to 1.85%.