The study aimed to characterize the dynamics involved in the water quality parameters in a biofloc system (BFT) during the super-intensive cultivation of Litopenaeus vannamei using two levels of artificial brackish water. The test was designed with two salinity levels, T₁₆ (16‰) and T₈ (8‰), with 4 replicates, and 250 shrimps/m² by 60 days, water analysis and animal performance were studied in each treatment. No significant differences were observed between the two salinities for biochemical oxygen demand (BOD₅), total chemical oxygen demand (CODt), and fixed suspended solids (FSS). Using CODt/BOD₅, it was possible to identify the water biodegradability and manage the concentration of organic and inorganic matter in the medium. Filtered chemical oxygen demand (CODf) was used to monitor the dissolved organic matter, which was higher in T₁₆. Carbohydrate (molasses) did not control total ammonia reaching in T₈ = 1.16±0.64 mg/L. This organic matter addition reduced the growth of chemoautotrophic nitrifying bacteria and interfered in the nitrogen dynamics. Regarding total solids and suspended solids, there was a significant difference between treatments, except for FSS. Dissolved oxygen (DO) and oxygen saturation (sO2) were significantly different between the treatments. The maintenance of a more neutral pH and greater alkalinity were observed, with significant differences between the treatments throughout the whole cultivation. Regarding the shrimp growth performance, the high salinity presented more weight gain, specific growth rate, feed conversion and final biomass, and lower mortality then lower salinity. These results showed that shrimps presented a higher performance in salinity 16‰.

该研究旨在描述在使用两级人工微咸水超集约化养殖南美白对虾期间生物絮团系统 (BFT) 中水质参数的动态特征。试验设计为两个盐度水平，T ₁₆ (16‰) 和T ₈ (8‰)，4 个重复，60 天250 只虾/m ²，对每个处理进行水质分析和动物性能研究。在生化需氧量 (BOD ₅ )、总化学需氧量 (CODt) 和固定悬浮固体 (FSS) 方面，两种盐度之间没有观察到显着差异。使用 CODt/BOD ₅，可以确定水的生物降解性并管理介质中有机和无机物质的浓度。过滤后的化学需氧量 (CODf) 用于监测溶解有机物，其在 T ₁₆中较高。碳水化合物（糖蜜）不能控制达到 T _{8 的}总氨= 1.16±0.64 毫克/升。这种有机物的添加减少了化学自养硝化细菌的生长并干扰了氮动力学。关于总固体和悬浮固体，除 FSS 外，处理之间存在显着差异。不同处理间的溶解氧 (DO) 和氧饱和度 (sO2) 有显着差异。观察到维持更中性的 pH 值和更大的碱度，在整个培养过程中处理之间存在显着差异。关于虾的生长性能，高盐度表现出更多的增重、比生长率、饲料转化率和最终生物量，死亡率低于低盐度。这些结果表明，虾在盐度16‰时表现出更高的表现。