Zhai Shao-Wei, Lu Xing, Yang Song, Binkowski Fred P, Deng Dong-Fang
School of Freshwater Sciences, University of Wisconsin-Milwaukee, Milwaukee, WI 53204, USA.
Fisheries College, Jimei University, Xiamen 361021, China.
Animals (Basel). 2025 May 19;15(10):1465. doi: 10.3390/ani15101465.
Yellow perch (), a native species of the Great Lakes, has experienced a significant decline in wild harvest since the 1990s, leading to an increased reliance on aquaculture. This study aimed to optimize feeding rate for yellow perch by evaluating the effects of various feeding rates (1.5%, 3.0%, 4.5%, 6.0%, and 7.5% body weight (BW)/day) on growth, nutrient retention, and heat shock protein 70 expression in perch fingerlings (initial BW: 1.73 ± 0.11 g) over a four-week period. Following the feeding trial, an acute heat shock was induced by raising the water temperature from 23 °C to 31 °C, followed by an 18 h recovery period. Results indicated that both growth rate and whole fish lipid content increased with higher feeding rates ( < 0.05), while nutrient retention decreased. Growth and energy retention did not significantly improve beyond 4.5%, with maximum energy retention observed at 3.9% BW/day. Heat shock protein 70 expression was highest in liver tissue at a feeding rate of 6.2% BW/day, indicating that higher feeding levels may enhance thermal stress response. These results indicate that a feeding rate of 4.5% BW/day supports optimal growth, while 6.2% BW/day may be necessary to improve heat shock tolerance. The study provides practical insights for refining feeding strategies in yellow perch aquaculture.
黄鲈（）是五大湖的本土物种，自20世纪90年代以来，其野生捕捞量大幅下降，导致对水产养殖的依赖增加。本研究旨在通过评估不同投喂率（1.5%、3.0%、4.5%、6.0%和7.5%体重（BW）/天）对鲈鱼幼鱼（初始BW：1.73±0.11克）在四周内的生长、养分保留和热休克蛋白70表达的影响，来优化黄鲈的投喂率。投喂试验结束后，通过将水温从23°C提高到31°C诱导急性热休克，随后进行18小时的恢复期。结果表明，随着投喂率的提高，生长率和全鱼脂质含量均增加（<0.05），而养分保留率下降。当投喂率超过4.5%时，生长和能量保留并未显著改善，在3.9%BW/天时观察到最大能量保留。在投喂率为6.2%BW/天时，肝脏组织中的热休克蛋白70表达最高，表明较高的投喂水平可能增强热应激反应。这些结果表明，4.5%BW/天的投喂率支持最佳生长，而6.2%BW/天可能是提高热休克耐受性所必需的。该研究为优化黄鲈水产养殖中的投喂策略提供了实际见解。
