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采用3种放养密度(100、200和300尾/m~3),投喂2种蛋白含量(28%和32%)的配合饲料,在海水网箱中饲养佛罗里达红罗非鱼(Oreochromis urolepishornorum?×O.mossambicus?).饲养84d的结果表明,在所有放养密度下,摄食含28%蛋白饵料的鱼的平均体重、平均日增重、特定生长率和成活率均高于摄食含32%蛋白饲料的鱼,而饵料系数则低于后者.放养密度对上述指标无显著影响,但是,对鱼体规格的变异程度影响显著.100尾/m~3放养密度组鱼的体重和全长的变异系数(分别平均为26.0%和8.51%)大于较高放养密度组(平均为20.8%和6.87%).整个实验期间,由于周围溶氧浓度下降,使网箱内溶氧浓度降至3ppm以下.这表明,如果能保持较高的周围溶氧浓度,那么,较高的放养密度是可行的.
Three Oreochromis urolepishornorum (Oreochromis urolepishornorum) were housed in seawater cages at three stocking densities (100, 200 and 300 tails / m ~ 3) and two kinds of compound diets with protein content of 28% and 32% × O.mossambicus.) The results of feeding for 84 days showed that the average body weight, average daily gain, specific growth rate and survival rate of fish fed 28% protein diet were higher than those fed 32% protein at all stocking densities Feed, while the bait coefficient was lower than the latter.The stocking density had no significant effect on the above index, but had a significant effect on the variation of fish size.100 tail / m ~ 3 stocking density fish body weight and full length The variation coefficient (average 26.0% and 8.51% respectively) was higher than that of the higher stocking density group (average 20.8% and 6.87%). During the whole experiment, the concentration of dissolved oxygen in the cages dropped below 3ppm This suggests that higher stocking densities are feasible if higher concentrations of ambient dissolved oxygen are maintained.