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首页> 外文期刊>Aquaculture Research >Effects of bioflocs on water quality, and survival, growth and digestive enzyme activities of Litopenaeus vannamei (Boone) in zero-water exchange culture tanks.
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Effects of bioflocs on water quality, and survival, growth and digestive enzyme activities of Litopenaeus vannamei (Boone) in zero-water exchange culture tanks.

机译：生物絮凝剂对零水交换培养池中凡纳滨对虾（Boone）的水质以及存活，生长和消化酶活性的影响。

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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+or-0.1 g) were stocked in each 150 L 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 14 mL L-1 in treatment bioflocs 1 and 20 mL L-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 (P>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.
机译：进行了为期30天的实验，研究了生物絮凝剂对南美白对虾凡纳滨对虾的水质以及存活，生长和消化酶活性的影响。每个150 L的水箱中共放养28只虾（7.4克或-0.1克）。管理了两种生物絮凝剂处理和一种对照：基于两种不同密度的生物絮凝剂的“ bioflocs 1”和“ bioflocs 2”，以及没有生物絮凝剂的净水控制。在生物絮凝剂1和生物絮凝剂2的处理池中分别添加了红糖，分别占虾饲料的28％和80％（分别对应于每天添加有机物的C / N比分别为10和14），以促进从第15天起，维持生物絮凝剂的生产，并在处理生物絮凝剂1中保持约14 mL L -1 ，在处理生物絮凝剂2中保持约20 mL L -1 。整个实验过程表明，在零水交换条件下，生物絮凝剂处理中所有参数均保持在虾养殖推荐水平之内，尤其是总氨氮和亚硝酸盐氮含量较低。到实验结束时，三组虾的成活率均在86％以上，差异无统计学意义（P> 0.05）。与对照相比，生物絮凝剂处理的增重率和特殊生长率均趋于增加。同时，生物絮凝处理对虾的蛋白酶，淀粉酶，纤维素酶和脂肪酶的总体比活性均高于对照。对于相同消化酶的比活性，生物絮凝剂处理与对照之间在肝，胰，胃和肠等不同器官之间的差异不一致。目前的结果表明，该生物絮凝剂不仅可以为虾养殖维持良好的水质条件，并帮助虾在零水交换养殖系统中良好生长，而且还可能对虾的消化酶活性产生积极影响。

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