The effects of stocking density on growth performance, serum biochemistry, digestive enzymes, immune response, and muscle quality of largemouth bass (Micropterus salmoides) reared in nine in-pond raceway systems (IPRS, 22.0 m × 5.0 m × 2.0 m) were studied. M. salmoides with initial an body weight of 8.25 ± 0.51 g and body length of 6.99 ± 0.44 cm were reared at an initial stocking density of 90.91 ind./m³ (low stocking density, LSD), 113.63 ind./m³ (middle stocking density, MSD), and 136.36 ind./m³ (high stocking density, HSD) with triplication. After 300 days of culture, MSD recorded the highest final body weight, weight gain, specific growth rate, and yield, but the food conversion ratio in MSD was the lowest. The viscerosomatic index in LSD was significantly higher than other groups. The fish serum reared at HSD showed significantly lower total protein, higher total cholesterol, triglyceride, total bilirubin, glucose content, alanine transaminase, and aspartate transaminase activity. Significantly lower intestinal amylase, lipase, trypsin activities, hepatic superoxide dismutase (SOD) and catalase (CAT) activities, and higher malondialdehyde content were detected in HSD compared to others. The content of crude lipid, saturated fatty acid decreased, and total essential amino acid, delicious amino acid, and polyunsaturated fatty acid increased in muscle with stocking density increase. No significant difference was observed in muscle texture. Profitability analysis indicated the benefit-to-cost ratio varied between 1.10 and 1.68, of which MSD was significantly higher than others. The optimal stocking density for M. salmoides should be 113.63 ind./m³ in an IPRS farm.

研究了放养密度对九个池内水道系统（IPRS，22.0 m × 5.0 m × 2.0 m）饲养的大嘴黑鲈（Micropterus salmoides）生长性能、血清生化、消化酶、免疫反应和肌肉质量的影响. M.鲈与初始的体重的8.25±0.51克，6.99±0.44厘米体长在90.91 ind./m的初始饲养密度中饲养³（低饲养密度，LSD），113.63 ind./m ³（中等放养密度，MSD)，和 136.36 ind./m ³（高放养密度，HSD）与三倍。培养300天后，MSD记录的最终体重、增重、比生长率和产量最高，但MSD的食物转化率最低。LSD的内脏指数明显高于其他组。在 HSD 饲养的鱼血清显示出显着较低的总蛋白、较高的总胆固醇、甘油三酯、总胆红素、葡萄糖含量、丙氨酸转氨酶和天冬氨酸转氨酶活性。与其他人相比，HSD 中检测到的肠道淀粉酶、脂肪酶、胰蛋白酶活性、肝超氧化物歧化酶 (SOD) 和过氧化氢酶 (CAT) 活性显着降低，丙二醛含量更高。粗脂、饱和脂肪酸含量下降，必需氨基酸总量、美味氨基酸、肌肉中的多不饱和脂肪酸随着饲养密度的增加而增加。肌肉质地没有观察到显着差异。盈利能力分析表明，收益成本比在 1.10 和 1.68 之间变化，其中 MSD 显着高于其他成本。最佳饲养密度M.鲈应该是113.63 ind./m ³的IPRS的农场中。