大菱鲆4个不同地理群体生长性能的比较

Comparison of growth performance in stocks of turbot Scophthalmus maximus L. from Britain,France,Denmark and Norway

在相同的养殖条件下，选取英国、法国、丹麦和挪威4个不同群体的大菱鲆Scophthalmus maximus L．，进行了1年生长性能的比较。结果表明，在3、6、9和12月龄，群体间体长和体重的差异均较大，在每一个生长时期各群体体长和体重的差异排序相同。4个群体的大菱鲆体长以线性速度生长，体重以指数形式生长。综合0～3月龄、0～12月龄的绝对增重率和3～6、6～9、9～12月龄的绝对增重率和瞬时增重率，在生长速度上依次为法国、英国、丹麦和挪威群体，在生长差异上丹麦和挪威及英国和法国之间的差异较小，丹麦、挪威和英国、法国之间的差异较大。大菱鲆各群体在3、6、9和12月龄的体重变异系数分别为22．84％～33．48％、21．36％～30．30％、19．64％～26．97％和21．06％～35．07％，认为这4个群体的大菱鲆均可作为选育的基础群体。

Turbot Scophthalmus maximus ,a benthic flatfish species,is a highly nutritious and valued species currently cultured widely in sea water in China. However, with development of its aquaculture,the growth has been slowed down due to serious germplasm degeneration in recent years and was heavily concerned by national related administrative departments. In this study, growth performance was compared in four different stocks of turbot from Britain, France, Denmark and Norway. The results showed that the difference of body length and body weight among these stocks are much significant （P〈0.01） for 3-month, 6-month, 9-month and 12- month turbot, and body length and body weight ranked in the same order for the four stocks based on the data collected in respective months. Body length of the four populations of turbot grew as linear functions, while their body weight as exponential functions. Through comparison of AGRw and IGRw at different growth stage, better growth performance was exhibited in France stocks than in the other three stocks,and the order was as follows. France 〉 Britain Denmark 〉Norway. At 3,6,9 and 12-month,the variation coefficients of body weight of the four turbot stocks were 22.84%-33.48% ,21.36%-30.30% ,19.64%-26.97% and 21.06%-35.07% respectively,and all the four stocks were suitable for selection on the basis of the variation coefficients of body weight.