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在浮式海水网箱(1.5m×1m×1.5m)中养殖石斑鱼幼鱼(9.4±0.1g),在等氮(52%CP)基础上进行以发酵豆粕和普通豆粕替代鱼粉的实验,为期56天。结果显示:在石斑鱼饲料中添加14%发酵豆粕,其增重率、特定生长率(SGR)、饲料效率和蛋白质效率与对照组没有显著性差异(P>0.05),以后随着发酵豆粕添加量的上升,这些指标都显著下降(P<0.05)。在同样替代水平下,添加21%发酵豆粕组,增重率,SGR,饲料效率和蛋白质效率都比添加20%豆粕组高(P<0.05),表明对海水肉食性鱼类来说,发酵豆粕是一种比豆粕更优良的蛋白源。用折线模型分析增重率随白鱼粉替代水平的变化关系,结果表明在石斑鱼配合饲料中,发酵豆粕替代白鱼粉的最适量为10%。从实际生产的经济效益出发,建议在饲料中添加14%发酵豆粕,对石斑鱼的生长和鱼体组成不会造成显著影响。
In a floating seawater cage (1.5m × 1m × 1.5m), grouper juveniles (9.4 ± 0.1g) were cultured, and on the basis of equal nitrogen (52% CP), fermented soybean meal and ordinary soybean meal were substituted for fishmeal For a period of 56 days. The results showed that the addition of 14% fermented soybean meal to grouper had no significant difference in weight gain, specific growth rate (SGR), feed efficiency and protein efficiency compared with the control group (P> 0.05) The increase of dosage, these indexes decreased significantly (P <0.05). At the same level of substitution, the addition of 21% fermented soybean meal had higher weight gain, SGR, feed efficiency and protein efficiency than the addition of 20% soybean meal (P <0.05), indicating that for marine carnivorous fish, fermented soybean meal Is a better than soybean meal protein source. Using the broken line model to analyze the relationship between the rate of weight gain and the replacement level of white fishmeal, the results showed that the optimum amount of substituting fermented soybean meal for whitefish was 10% in the mixed feed of grouper. Based on the economic benefits of actual production, it is recommended to add 14% fermented soybean meal to the feed, which will not significantly affect the growth and fish body composition of the grouper.