Abstract: To investigate the influence of stocking density on growth of two-year old tapertail anchovy Coilianasus with initial body mass of (4.43±1.25) g were reared in a 667 m2 enclosure in 3 ponds at stocking density of 500 ind./667 m2 (group A), 1 000 ind./667 m2 (group B) and 1 500 ind./667 m2 (group C) and fed oriental river prawn Macrobrachiumnipponense for 189 days with triplication. The results showed that there were significantly higher body mass, body length, weight gain rate, growth rate and specific growth rate in group A than those in group B and group C (P<0.05), with significantly higher survival rate in group A than that in group C (P<0.05), and without significant difference between group A and group B(P>0.05) and without significant difference in yield per unit area in the three groups (8.59 kg/667 m2 in group A, 7.28 kg/667 m2 in group B and 11.33 kg/667 m2 in group C) (P>0.05). There were no significant differences in the condition factor, viscera-somatic index (VSI) and relative gut length (RGL) in the two-year old tapertail anchovy (P>0.05), significantly higher hepato-somatic index (HSI) in group C than that in group B (P<0.05),without significant difference from group A (P>0.05). The body mass was shown to be correlated with body length using a power function m=aLb(a=0.000 8-0.002 8, b=3.076 8-3.534 3), and the relationship between body length or body weight and culture days was well described by a linear function (L=at+b, a=0.029-0.048, b=11.625-12.510; m=at+b, a=0.080-0.146, b=3.142-5.576), without significant difference in the coefficient of variations of body mass and body length in three groups (P>0.05). In group A, 90.0% of individuals with body length of 18.1-22.9 cm in the total sample number, and 88.3% of individuals with body mass of 25.31-40.94 g in the total sample number, better than that in other groups. The findings indicated that the two-year old tapertail anchovy had decrease in growth performance with the increase in stocking density, with the optimal stocking density of 500 ind./667 m2 in this experimental conditions.
刘永士, 王建军, 朱建明, 陆根海, 施永海, 刘建忠. 养殖密度对2龄刀鲚生长的影响[J]. 大连海洋大学学报, 2021, 36(1): 66-73.
LIU Yongshi, WANG Jianjun, ZHU Jianming, LU Genhai, SHI Yonghai, LIU Jianzhong. Effects of stocking density on growth of two-year old tapertail anchovy Coilia nasus. Journal of Dalian Ocean University, 2021, 36(1): 66-73.
2021, Vol. 36 
