Effect of Stocking Density on Water Quality, Harmful Nitrogen Control, and Production Performance of Penaeus vannamei in Biofloc-Based Systems with Limited Water Exchange
文献类型： 外文期刊
作者： Xu, Wujie 1 ; Zhang, Bin 1 ; Zhao, Yongzhen 1 ; Cao, Yucheng 2 ;
作者机构： 1.Guangxi & ASEAN Coconstruct Minist & Prov, Minist Agr & Rural Affairs, Key Lab Aquaculture Genet & Breeding & Hlth Aquacu, Key Lab Comprehens Dev & Utilizat Aquat Germplasm, Nanning 530021, Peoples R China
2.Chinese Acad Fishery Sci, South China Sea Fisheries Res Inst, Southern Marine Sci & Engn Guangdong Lab Zhuhai, Guangzhou 510300, Peoples R China
关键词： Penaeus vannamei; biofloc technology; stocking density; harmful nitrogen; production performance
期刊名称：FISHES （ 影响因子：2.4； 五年影响因子：2.4 ）
ISSN：
年卷期： 2025 年 10 卷 7 期
页码：
收录情况： SCI
摘要： Biofloc technology (BFT) represents a promising approach among sustainable options for the sustainable intensification of shrimp aquaculture, helping to mitigate environmental impacts while maintaining production yields. This study evaluated the effects of stocking density (200, 400, 600, and 800 ind/m(3)) on the water quality, nitrogen dynamics, and production performance of Penaeus vannamei in BFT systems with limited water exchange (<10%). During an eight-week production-scale trial, water quality exhibited density-dependent deterioration, with TAN and NO2--N peaks increasing from 0.4 to 2.3 mg/L and 1.0 to 4.2 mg/L, respectively, as density rose from 200 to 800 ind/m(3). Concurrently, DO and pH declined significantly from 6.7 to 5.1 mg/L and 7.6 to 7.3, respectively. Production performance revealed critical trade-offs: while yield rose from 3.62 to 9.09 kg/m(3), individual growth metrics declined, including harvest body weight (19.14 to 14.12 g), size variation (14.03% to 23.90%), and survival rate (94.6% to 79.8%). Quadratic regression analysis and response surface analysis identified 400 similar to 600 ind/m(3) as the optimal density range, achieving balanced outcomes: yield (6.74 similar to 8.43 kg/m(3)), harvest body weight (16.72 similar to 18.03 g), survival rate (84.0%similar to 93.5%), and feed conversion ratio (1.14 similar to 1.22). These findings provide actionable guidelines for optimizing stocking density in commercial BFT systems, highlighting the importance of balancing productivity with environmental sustainability under limited water exchange.
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