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首页> 外文期刊>Aquaculture International >The effect of different alkalinity levels on Litopenaeus vannamei reared with biofloc technology (BFT)
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The effect of different alkalinity levels on Litopenaeus vannamei reared with biofloc technology (BFT)

机译：不同碱度对生物絮凝技术饲养的凡纳滨对虾的影响

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摘要

The initial stages of rearing marine shrimp using biofloc technology (BFT) involve the biofloc formation process. At the same time, there is an increase in the levels of total suspended solids and a decrease in alkalinity and pH. This reduction of alkalinity and pH occurs due to the consumption of inorganic carbon by the autotrophic bacteria present in the bioflocs and biofilms. The aim of this study was to evaluate the effects of different alkalinities on water quality and the zootechnical performance of the marine shrimp Litopenaeus vannamei in a BFT system. The experiment consisted of four treatments, with three replicates each: 75, 150, 225 and 300 mg CaCO3/L. To maintain the alkalinity at the established level, sodium bicarbonate was applied. For the experiments, twelve experimental units (area = 0.20 m(2)) with an effective volume of 50 L were stocked with 30 juvenile L. vannamei (0.20 +/- A 0.07 g), to achieve a stocking density of 150 shrimps/m(2) and were maintained for an experimental period of 49 days. The 75 treatment presented the highest levels of ammonia and nitrite throughout the study, compared to the 150 and 300 treatments. The results showed that higher alkalinity favors biofloc formation and the establishment of nitrifying bacteria.
机译：使用生物絮凝技术（BFT）养殖海虾的初始阶段涉及生物絮凝物形成过程。同时，总悬浮固体含量增加，碱度和pH降低。这种碱度和pH的降低是由于生物絮凝物和生物膜中存在的自养细菌消耗了无机碳而发生的。这项研究的目的是评估在BFT系统中不同碱度对水生虾对虾凡纳滨对虾的水质和动物技术性能的影响。该实验由四种处理组成，每种处理重复三次：75、150、225和300 mg CaCO3 / L。为了保持碱度在确定的水平，使用碳酸氢钠。对于实验，将有效体积为50 L的十二个实验单位（面积= 0.20 m（2））放养30只南美白对虾（0.20 +/- A 0.07 g），以实现150只虾/只的放养密度。 m（2），并维持49天的实验时间。与150和300次处理相比，在整个研究中75次处理呈现最高水平的氨和亚硝酸盐含量。结果表明，较高的碱度有利于生物絮凝物的形成和硝化细菌的建立。

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