褶皱臂尾轮虫替代饲料提升凡纳滨对虾标粗性能的研究OA

To investigate the feasibility of completely substituting commercial feed with live prey in the nursery phase of Pacific white shrimp(Litopenaeus vannamei),a 21-day greenhouse nursery experiment was conducted.Two groups were compared:one fed exclusively with the rotifer Brachionus plicatilis(R group)and the other with commercial feed(F group).The results showed that the nursery survival rate of the R group(90.5±3.1)%was sig-nificantly higher than that of the F group(78.2±5.6)%(P<0.05).The R group shrimp reached the target size fas-ter and exhibited a lower coefficient of variation in body length(8.2%vs 12.6%),indicating superior population uniformity.Water quality monitoring revealed that the R group effectively slowed the accumulation of ammonia nitro-gen and nitrite.A subsequent 75-day pond culture tracking demonstrated that the R group post-larvae maintained significant advantages(P<0.05)in harvest survival rate,final body weight,yield per unit area,and feed conver-sion ratio.This study indicates that the complete substitution of commercial feed with B.plicatilis during nursery can systematically improve seed quality,ameliorate the culture environment,and translate"physical advantages"into economic benefits in subsequent grow-out stages,providing a reliable strategy for ecological and efficient shrimp nursery.