College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, 310000, China.
Zhejiang Fisheries Technical Extension Center, Hangzhou, 310023, China.
Environ Pollut. 2021 Dec 15;291:118152. doi: 10.1016/j.envpol.2021.118152. Epub 2021 Sep 9.
The operation of the equipment in industrial recirculating aquaculture systems (RAS) affects the underwater soundscape of aquaculture tanks where fishes live. This study evaluated the influence of commercial industrial RAS noise on the growth, physiology, and behavior of juvenile largemouth bass (Micropterus salmoides). In this study, two experimental groups, the RAS noise group (115 dB re 1 μPa RMS) and the ambient group (69 dB re 1 μPa RMS), were studied. The water quality and feeding regime for each group were kept the same during the 60-day experiment. Results showed that there was no significant difference in the average daily feed intake of the fish between the two treatments, while the rate of weight gain of the ambient group (755.27 ± 65.62%) was significantly higher than that of the noise group (337.66 ± 88.01%). In addition, the RAS environmental noise also had an adverse effect on the anti-oxidation and immune systems of the fish based on results of analysis of blood, liver, and intestinal samples. Moreover, environmental noise affected the swimming behavior of the fish school. The mean angle and distance between the focal fish and its nearest neighbor fish in RAS noise group were 33.3° and 92.1 mm, respectively, which were larger than those of the ambient group with 24.4° and 89.5 mm, respectively. From the above results, RAS noise did influence the welfare of largemouth bass, and the soundscape in RAS hence should be managed in real production.
养殖系统设备的运行对鱼类生存的养殖水箱水下声景产生影响。本研究评估了商业工业循环水养殖系统噪声对幼年大口黑鲈（Micropterus salmoides）生长、生理和行为的影响。在这项研究中，研究了两个实验组，即循环水养殖系统噪声组（115dB re 1 μPa RMS）和环境组（69dB re 1 μPa RMS）。在 60 天的实验中，保持每组的水质和喂养方式相同。结果表明，两组鱼的平均日采食量没有显著差异，而环境组的增重率（755.27±65.62%）显著高于噪声组（337.66±88.01%）。此外，循环水养殖系统环境噪声还通过血液、肝脏和肠道样本的分析对鱼类的抗氧化和免疫系统产生了不良影响。此外，环境噪声还影响了鱼群的游泳行为。在循环水养殖系统噪声组中，焦点鱼与其最近邻鱼之间的平均角度和距离分别为 33.3°和 92.1mm，大于环境组的 24.4°和 89.5mm。从以上结果可以看出，循环水养殖系统噪声确实影响了大口黑鲈的福利，因此在实际生产中应管理养殖系统的声景。
