关键词: 天然溪流, 生态养殖, 虹鳟鱼, natural stream, ecological cultivation, rainbow trout

Abstract: The present study determined the hatching rate, survival rate, and net weight of rainbow trout, as well as water temperature, dissolved oxygen level, and ammonia-nitrogen content in natural flow-through aquaculture system (NFTAS) based on a culture experiment. The results showed that the hatching rate of egg in NFTAS was 89.2%, the survival rate was 92.1%. The total fish harvest after 12-months-feeding was 13 262.72 kg, the mean body weight was 1.36 kg per fish, and the mean fish harvest per mu was 6 270 kg. The coefficient of feeds was 1.07. The water temperature, dissolved oxygen content and ammonia nitrogen content in NFTAS were maintained at normal levels which were close to the suitable growth temperature of the rainbow trout, indicating that the flow of natural stream was sufficient to keep the normal growth of the rainbow trout. Heaters, equipment for heating or oxygen were no necessary in NFTAS. This culture experiment provided the practical basis for NFTAS promoting.