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

Abstract:

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 L^3.2603 (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℃.