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开始投饵期的罗非鱼鱼苗在容量20升的培养箱里,用六种放养密度(2,4,6,8,10,12尾/升)和三种投饵量(6,12,24％日体重)放养40或50天。高投饵量时,增进了鱼苗的生存和生长,但是鱼苗的生存率同放养密度没有一致关系。每个试验组里,同类相残的死亡率计10-35％,与投饵率呈反关系。在相同条件下,尼罗罗非(雌)×奥利亚(雄)杂交种鱼苗比莫桑比克罗非鱼苗的生存率高,饵料系数佳,及在尺寸分布上也较均匀。
The tilapia fry started at the beginning of the feeding period in a 20-liter incubator with six stocking densities (2,4,6,8,10,12 tails / liter) and three bite sizes (6,12, 24% of body weight) Stocked for 40 or 50 days. The high feed rate increased the survival and growth of fry, but the survival rate of fry did not agree with the stocking density. In each experimental group, 10-35% of the deaths of the same type were found, which was inversely related to the feed rate. Under the same conditions, the survival rate of Nile tillage × Oryzae hybrids was higher than that of Mozambique tilapia seedlings, the feed coefficient was good, and the size distribution was more uniform.