The objective of this study was to establish a proper feeding regime for juvenile black rockfish (Sebastes schlegilii) intended for stock enhancement. We used a combined experimental design to assess the effects of different feeding rates (1%, 3% and 5% body weight per day (BW/day)) and feeding frequencies (apparent satiety or restricted feeding 1 to 3 times daily) on survival, growth, digestive enzyme activity, body composition and feeding costs over 50 days, from newly weaned (initial average weight 1.5 ± 0.2 g) to release size. The results showed that feeding rate significantly affected fish growth, feed utilization and body composition. The highest feed conversion ratio was at 3% BW/day. Increased feeding rates resulted in enhanced growth and higher body lipid content, but this was also accompanied by decreased contents of moisture, protein and ash. With feeding to apparent satiety, increased feeding frequency resulted in higher growth performance and enhanced intestinal lipase activity but decreased gastric protease activity. There were no growth improvements or effects on digestive enzyme activity and body composition with increasing feeding frequency (from one to three times daily) under a fixed‐quantify feeding (3% BW/day). Feed costs increased with increasing feeding rates or apparent satiety feeding frequencies and were associated with shorter growth times to reach a suitable size for release. Our study suggests that a feeding rate of 3% BW/day is the best feeding regime for proper growth and reduced feed costs in juvenile black rockfish before releasing for stock enhancement.

中文翻译：

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不同饲养方式对黑鲈（Sebastes schlegilii）存活，生长，消化酶活性，身体组成和饲养成本的影响

这项研究的目的是为少年黑石鱼（Sebastes schlegilii），旨在提高库存。我们使用组合实验设计评估了不同的喂养率（每天体重的1％，3％和5％（体重/天））和喂养频率（表观饱腹感或每天限制喂养1至3次）的影响从刚断奶（初始平均体重1.5±0.2 g）到释放大小，需要50天以上的时间，生长，消化酶活性，身体组成和摄食成本。结果表明，饲喂速度显着影响鱼类的生长，饲料利用率和身体组成。最高的饲料转化率是3％BW /天。较高的饲喂速度导致生长加快和体内脂质含量增加，但同时水分，蛋白质和灰分含量降低。有了饱腹感，较高的进食频率导致较高的生长性能和增强的肠道脂肪酶活性，但降低了胃蛋白酶活性。在固定定量饲喂（3％BW /天）下，随着饲喂频率的增加（每天从一到三次），生长没有改善或对消化酶活性和身体组成的影响。饲料成本随着饲喂速率或明显饱腹感饲喂频率的增加而增加，并且与较短的生长时间相关，以达到合适的释放尺寸。我们的研究表明，每天投喂3％BW的饲料是最佳的投喂方式，可以适当地生长，并在释放黑鲈鱼以提高种群数量之前降低其饲料成本。在固定定量饲喂（3％BW /天）下，随着饲喂频率的增加（每天从一到三次），生长没有改善或对消化酶活性和身体组成的影响。饲料成本随着饲喂速率或明显饱腹感饲喂频率的增加而增加，并且与较短的生长时间相关，以达到合适的释放尺寸。我们的研究表明，每天投喂3％BW的饲料是最佳的投喂方式，可以适当地生长，并在释放黑鲈鱼以提高种群数量之前降低其饲料成本。在固定定量饲喂（3％BW /天）下，随着饲喂频率的增加（每天从一到三次），生长没有改善或对消化酶活性和身体组成的影响。饲料成本随着饲喂速率或明显饱腹感饲喂频率的增加而增加，并且与较短的生长时间相关，以达到合适的释放尺寸。我们的研究表明，每天投喂3％BW的饲料是最佳的投喂方式，可以适当地生长，并在释放黑鲈鱼以提高种群数量之前降低其饲料成本。饲料成本随着饲喂速率或明显饱腹感饲喂频率的增加而增加，并且与较短的生长时间相关，以达到合适的释放尺寸。我们的研究表明，每天投喂3％BW的饲料是最佳的投喂方式，可以适当地生长，并在释放黑鲈鱼以提高种群数量之前降低其饲料成本。饲料成本随着饲喂速度或明显饱腹感饲喂频率的增加而增加，并且与较短的生长时间相关，以达到合适的释放尺寸。我们的研究表明，每天投喂3％BW的饲料是最佳的投喂方式，可以使幼小黑石鱼适当生长并降低投饵成本，然后再放养以提高种群。