工厂化流水养殖条件下大菱鲆幼鱼的适宜投喂率研究

Study on the Suitable Feeding Rate of the Juvenile Turbot under Factory Flowing Water Culture System

摘要: 本实验在工厂化流水养殖条件下，研究不同的投喂率对大菱鲆幼鱼生长的影响。实验设置5档投喂率，分别为1.2%、1.5%、1.8%、2.1%和2.4%，对大菱鲆幼鱼(7.14 ± 0.04) g进行为期6周的养殖实验。结果表明，随着投喂率的提高，大菱鲆幼鱼特定生长率显著升高(P < 0.05)。存活率随着投喂率的增加而呈现先升高后降低的趋势，并在投喂率为1.5%时达到最大值，但在1.2%、1.5%和1.8%之间差异不显著(P > 0.05)。饵料系数随着投喂率的增加呈现出先降低再升高的趋势，并在投喂率为1.5%时达到最小值，但在1.2%、1.5%和1.8%之间差异不显著(P > 0.05)。综上所述，大菱鲆幼鱼在密度为240尾/m3、水温为(13.5 ± 0.5)℃流水养殖条件下，适宜的投饲率推荐为1.5%~1.8%。

Abstract: The experiment was conducted to study the effects of different feeding rates on the growth and survival rate of juvenile turbot (Scophthalmus maximus) (7.14 ± 0.04) g under factory flowing water culture system. The feeding rates were 1.2%, 1.5%, 1.8%, 2.1% and 2.4%, respectively. The results showed that the specific growth rate increased significantly (P < 0.05) with the increase of feeding rate. The survival rate increased at first and then decreased with the increase of feeding rate, the highest value was in the 1.5% group, however, the values in 1.2%, 1.5% and 1.8% groups did not differ significantly (P > 0.05). With the increase in feeding rate, the feed coefficient decreased at first and then increased, the lowest value was in the 1.5% group, however, there were no significant differences among 1.2%, 1.5% and 1.8% groups (P > 0.05). In conclusion, the optimum feeding rate of juvenile turbot was recommended as 1.5% - 1.8% at a density of 240 fish/m3 and a water temperature of (13.5 ± 0.5)˚C.