尼罗罗非鱼幼鱼氮收支与饲料组成关系

用生物学方法测定和比较了三种饲料喂养的"吉富"品系尼罗罗非鱼的氮收支,同时用化学方法估算和比较了三种饲料组的含氮排泄废物。结果表明,饲料种类对尼罗罗非鱼的特定生长率及饲料转化效率有显著影响(P<0.01),饲喂欧洲料的鱼的特定生长率最快;饲料种类对尼罗罗非鱼的氮收支分配也有显著影响(P<0.01),饲喂大江料的鱼用于生长的氮的比例最高;饲料蛋白源的质量、含能量以及营养平衡状况直接影响鱼的氮代谢,提高饲料质量是从源头控制养殖污染的关键。

Relationship between the nitrogen budget and diet types in juvenile of Oreochromis niloticus

The nitrogen budget of GIFT strain of Nile tilapia fed with three types of diets(Europe,"Dajiang", Tilapia farm made) was determined and compared by biological method, while excretive nitrogen was determined and compared by chemical method. The results showed that the specific growth rate and food conversion rate were both very significantly affected by diet types(P<0.01). Nile tilapia fed with "Europe"diet had the best growth. From the aspect of allocation of intake nitrogen, Nile tilapia fed with "Dajiang" diet had the highest utilization proportion of nitrogen for growth. The nitrogen budget of tilapia is affected by the quality of protein, energy content and nutrition equilibrium of feed. It is key issue to improve feed quality to reduce aquacultural pollution.