生物絮团技术应用于凡纳滨对虾生产性育苗实验

The application of biofloc technology in Litopenaeus vannamei industrial breeding experiment

为提高凡纳滨对虾人工育苗生产的生态化和健康化水平,本文在育苗生产中应用生物絮团技术,添加红糖为碳源以提高育苗水体的碳氮比(C/N)。在蔗糖添加量为投饵量的55%、实验池减少50%换水量的情况下,至P5发育期时实验池的总投饵量比对照池平均减少15. 9%,虾苗平均体长提高8. 1%、存活率提高28. 2%,而氨氮、总无机氮等水质指标分别升高32. 0%和24. 1%。表明利用生物絮团技术育苗时,对不同发育阶段换水量的减少要灵活掌控,并且后期要适当增加换水量。

In order to improve the ecological and healthful level of Litopenaeus vannamei artificial propagation,the application research of biofloc technology in shrimp industrial breeding was carried out.The present study attempted to rise the C/N ratio of breeding water by using sucrose as the carbon source.Our study showed that when carbon additive amount was 55%of feeding and the exchanged water was reduced by 50%,the total feeding amount was 15.9%lower,the average length of young shrimp was 8.1%higher,the survival rate was 28.2%higher,and the ammonia nitrogen and total inorganic nitrogen etc indexes were 32.0%and 24.1%higher,respectively.The results showed that the water exchange in different hatchery period should be controlled flexibly and increased appropriately in later stages when applying biofloc technology in shrimp industrial breeding.