National Engineering Research Center for Facilitated Marine Aquaculture, Zhejiang Ocean University, Zhoushan 316022, China.
Marine Science and Technology College, Zhejiang Ocean University, Zhoushan 316022, China.
Comp Biochem Physiol A Mol Integr Physiol. 2023 Jan;275:111331. doi: 10.1016/j.cbpa.2022.111331. Epub 2022 Oct 7.
Aquaculture has greater potential for seafood production than wild capture fisheries. To meet the growing demand for seafood, China's marine aquaculture industry has begun building deep-water cages in the open sea. However, under these conditions, fish encounter strong currents and waves, and ensuring their healthy growth is key to the farming process. To address these issues, it is necessary to study the sustained swimming abilities of cultured fish species. Blackhead seabream (Acanthopagrus schlegelii) and red drum (Sciaenops ocellatus) are traditional economic fish species in China; however, their sustained swimming ability under a constant current has been underexplored. Therefore, we examined the endurance swimming ability of three size classes of blackhead seabream and red drum at 20 °C. The fish were then subjected to swimming tests of 0, 30, 60, 90, 120, and 150 min at a constant swimming speed of 0.55 m/s (0.80 m/s), 0.65 m/s (0.90 m/s), and 0.70 m/s (0.98 m/s). The fish were then dissected to obtain muscle, blood, and liver samples; sample metabolite concentrations were measured at six time points, each of which guaranteed five sets of valid data. The results indicated that red drum has a significantly stronger swimming ability, and can be cultured in waters with a short-term flow rate not exceeding 0.75 m/s or 3.5 BL/s. Further, blackhead seabream can be cultured in waters with a flow velocity lower than 0.55 m/s or 2.5 BL/s. The species-related metabolic differences were mainly reflected in the hepatic glycogen and blood glucose concentrations, and those in swimming ability caused by body length were mainly reflected by the hepatic glycogen concentration. The hepatic glycogen concentration had the most significant effect on fish with body lengths >28 cm (P < 0.05). Overall, the experimental results indicated that the liver plays a major role in the physiological level of fish swimming fatigue, providing a direction for further research.
水产养殖在海鲜生产方面比野生捕捞渔业具有更大的潜力。为了满足人们对海鲜日益增长的需求，中国的海水养殖业已开始在公海建造深水网箱。然而，在这些条件下，鱼类会遇到强流和海浪，确保其健康生长是养殖过程中的关键。为了解决这些问题，有必要研究养殖鱼类的持续游泳能力。黑鲷（Acanthopagrus schlegelii）和红鼓（Sciaenops ocellatus）是中国传统的经济鱼类，但它们在恒定流中的持续游泳能力尚未得到充分探索。因此，我们研究了三个规格的黑鲷和红鼓在 20°C 时的耐力游泳能力。然后，将鱼在 0.55 m/s（0.80 m/s）、0.65 m/s（0.90 m/s）和 0.70 m/s（0.98 m/s）的恒定游泳速度下分别进行 0、30、60、90、120 和 150 分钟的游泳测试。然后将鱼解剖以获得肌肉、血液和肝脏样本；在六个时间点测量样本代谢物浓度，每个时间点保证有五组有效数据。结果表明，红鼓的游泳能力明显更强，可以在短期流速不超过 0.75 m/s 或 3.5 BL/s 的水域中养殖。此外，黑鲷可以在流速低于 0.55 m/s 或 2.5 BL/s 的水域中养殖。种间相关的代谢差异主要反映在肝糖原和血糖浓度上，而由体长引起的游泳能力差异主要反映在肝糖原浓度上。体长大于 28 cm 的鱼类肝糖原浓度影响最大（P < 0.05）。总的来说，实验结果表明，肝脏在鱼类游泳疲劳的生理水平中起着重要作用，为进一步的研究提供了方向。
