Impact of stocking density of largemouth bass on the self-cleaning performance of a circular aquaculture tank

文献类型： 外文期刊

第一作者： Qu, Xiaoyu

作者： Qu, Xiaoyu;Tao, Yi;Wang, Fei;Gao, Yang;Li, Dezhen;Zu, Fuzhi;Feng, Dejun;Wu, Yanfei;Wu, Lianhui;Hu, Jiajun

作者机构：

关键词： Largemouth bass; stocking density; aquaculture tanks; waste collection; hydrodynamic characteristic

期刊名称：AQUACULTURE （ 影响因子：3.9； 五年影响因子：4.4 ）

ISSN： 0044-8486

年卷期： 2025 年 596 卷

页码：

收录情况： SCI

摘要： Reasonable regulation of stocking density enables aquaculture tanks to achieve excellent self-cleaning performance, which plays a crucial role in the healthy growth and overall welfare of fish. Enhancing the waste collection, and removal capacity and improving the hydrodynamic characteristics in these tanks are pressing issues in the development of recirculating aquaculture systems (RAS) toward sustainable aquaculture. This study investigates the impact of fish (largemouth bass) stocking density (3, 6, and 9 kg/m(3)) on the self-cleaning performance of circular aquaculture tanks under single- and dual-inlet modes through experiments. The effects of stocking density and fish behavior on the hydrodynamic characteristics of the tanks were analyzed using the average velocity v(avg), drag coefficient C-t, and turbulence intensity root mean square (RMS). Finally, the sensitivity analysis method was adopted to quantify the sensitivity (S) of RMS to changes in stocking density and inflow rate under two different water-inlet modes. This allows the comparison of the comprehensive impacts of stocking density and inflow rate on the self-cleaning performance of culture tanks. The results indicate that under a single-inlet mode, adjusting Q = 8 L/min and rho = 9 kg/m(3) maximizes the self-cleaning performance of the tank compared with fishless conditions, with waste collection efficiency increasing by approximately 4.3 times, under a dual-inlet mode, adjusting Q = 10 L/min and rho = 9 kg/m(3) results in the greatest enhancement in self-cleaning performance relative to fishless conditions, with an increase in waste collection efficiency of approximately 3.44 times. In both single- and dual-inlet modes, when the stocking density increases from 0 to 9 kg/m(3), the RMS values increase by a maximum of approximately 2.3 and 1.2 times, respectively. Furthermore, when 6 kg/m(3) < rho < 9 kg/m(3) and 8 L/min < Q < 10 L/min, the RMS is more sensitive to changes in stocking density under a single-inlet mode and is more sensitive to changes in inflow rate under a dual-inlet mode. The findings can offer guidance on the optimal stocking densities for aquaculture tanks to obtain superior self-cleaning performance, and contribute to the practical management of RAS.

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