Effects of bioflocs on water quality, and survival, growth and digestive enzyme activities of Litopenaeus vannamei (Boone) in zero-water exchange culture tanks

文献类型： 外文期刊

第一作者： Xu, Wu Jie

作者： Xu, Wu Jie;Pan, Lu Qing;Sun, Xiao Hua;Huang, Jie

作者机构：

关键词： bioflocs;Litopenaeus vannamei;water quality;survival;growth;digestive enzyme activity

期刊名称：AQUACULTURE RESEARCH （ 影响因子：2.082； 五年影响因子：2.415 ）

ISSN： 1355-557X

年卷期： 2013 年 44 卷 7 期

页码：

收录情况： SCI

摘要： A 30-day experiment was performed to investigate the effects of bioflocs on water quality, and survival, growth and digestive enzyme activities of the white shrimp Litopenaeus vannamei. Altogether 28 shrimp (7.4 +/- 0.1g) were stocked in each 150L tank. Two bioflocs treatments and one control were managed: bioflocs 1' and bioflocs 2' based on two different densities of the bioflocs, and clean water control without the bioflocs. Brown sugar was added to the bioflocs 1 and bioflocs 2 treatment tanks accounting for 28% and 80% of the shrimp feed respectively (corresponding to proximate C/N ratios of 10 and 14 in daily additions of organic matter respectively), so as to promote bioflocs production and approximately 14mLL-1 in treatment bioflocs 1 and 20mLL-1 in treatment bioflocs 2 were maintained from day 15. Monitoring of selected water quality parameters throughout the whole experiment period showed that all parameters remained within recommended levels for shrimp culture in the bioflocs treatments at zero-water exchange, especially low total ammonia nitrogen and nitrite nitrogen levels. By the end of the experiment, shrimp survival rates were above 86%, with no significant differences (0.05) among the three groups. Both weight gain rate and special growth rate tended to increase in the bioflocs treatments compared to those in the control. Meanwhile, the overall specific activities of protease, amylase, cellulase and lipase of the shrimp in the bioflocs treatments were all higher than those in the control; and for the specific activity of the same digestive enzyme, the differences between the bioflocs treatments and the control performed inconsistently among different organs: hepatopancreas, stomach and intestine. Present results suggest that the bioflocs can not only maintain favourable water quality conditions for shrimp culture and help shrimp grow well in zero-water exchange culture systems, but may also have a positive effect on digestive enzyme activities of the shrimp.

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