池养美洲鲥1^+龄鱼种生长特性的研究

Study of growth characteristics of pond-reared one-year-old Alosa sapidissima

对美洲鲥1^+龄鱼种在池塘条件下的生长特性进行了研究。以10~#东、10~#西2个池塘开展美洲鲥养殖试验,初始养殖密度分别为15 600尾/hm^2、9 600尾/hm^2;养殖成活率分别为46.65%、42.70%。合并统计分析美洲鲥养殖周期内生长特性,在16.4~30.8℃条件下,经185 d的养殖试验,美洲鲥体长增长48.3%,体质量增加286.8%,体长与体质量呈幂函数关系:W=0.006 7L~(3.2603(,R^2=0.941 6,呈匀速生长,日均增长量随着养殖天数的增加呈"U"型变化,日均增重量随着养殖天数的增加呈"W"型变化,肥满度变化范围为1.34~1.63,最大值出现在夏季阶段平均水温最高的时段,美洲鲥1^+龄鱼种适宜生长水温范围为16~30℃,最适生长水温为19~24℃。

Studies were conducted on the growth characteristics of one-year-old Alosa sapidissima in pond culture.The cultivation experiment was carried out in No.10 east and No.10 west ponds.The initial culture density was 15 600 ind/hm2,and the survival rate was 46.65% in No.10 east pond.By contrast,in No.10 west pond,the initial culture density was 9 600 ind/hm2,and the surviving rate was 42.70%.The growth characteristics of Alosa sapidissima in culture cycle were analyzed according to the merged date of growth.The results showed that body length growth increased by 48.3% and body weight growth increased by 286.8% in the condition of 16.4-30.8 ℃ after 185 days rearing.The relationship between body weight and body length was W = 0.0067 L3.2603（R2= 0.941 6）.The power was near 3 which indicated the growth of weight was the same as that of body length.The trend of the daily length increase looked U-shaped while the increase of daily weight looked W-shaped during the experiment.The fatness varied from 1.34 to 1.63,and the highest fatness appeared in the time frame of the highest average water temperature during the summer.The suitable water temperature was 16-30 ℃,and the optimum water temperature was 19-24 ℃.