This study investigated the effect of stocking density on growth performance, blood biochemical profiles, antioxidative capacity, and muscle quality of gibel carp (Carassius gibelio). Gibel carps (initial body weight 57.04 ± 1.89 g) were reared at high stocking density (HSD, 10.85 kg m⁻³), medium stocking density (MSD, 5.06 kg m⁻³), and low stocking density (LSD, 1.47 kg m⁻³) for 60 days. The LSD group exhibited the highest growth rate, while HSD significantly inhibited fish growth. The muscular compositions of crude fat, crude ash, and moisture were significantly changed by stocking density, but crude protein content did not differ significantly. The stocking density altered the muscular texture profiles of gibel carp. Compared to either the HSD group or the MSD group, the highest levels of resilience and springiness occurred in the LSD group. Significant differences were observed in the levels of plasma glucose, alanine aminotransferase, aspartate aminotransferase, cholesterol, and creatinine among three groups. The fish exhibited the highest level of plasma cortisol as well as the lowest levels of triiodothyronine and thyroxine in the HSD group. The fish stocked in the LSD group showed the highest activities of superoxide dismutase, glutathione peroxidase, and catalase as well as the highest content of glutathione in liver. The significant highest total antioxidant capacity occurred in the fish stocked in the LSD group. The results showed that HSD resulted in chronic crowding stress, and exerted negative impact on growth performance, muscle quality, and antioxidative capacity of gibel carp.

这项研究调查了放养密度对长鳍鲤（Carassius gibelio）的生长性能，血液生化特征，抗氧化能力和肌肉质量的影响。以高放养密度（HSD，10.85 kg m ^-3），中放养密度（MSD，5.06 kg m ^-3）和低放养密度（LSD，1.47 kg m ）饲养Gibel鲤鱼（初始体重57.04±1.89 g）⁻³），持续60天。LSD组表现出最高的生长速度，而HSD则显着抑制鱼类生长。粗脂肪，粗灰分和水分的肌肉组成因放养密度而显着变化，但粗蛋白含量没有显着差异。放养密度改变了长鳍鲤的肌肉质地。与HSD组或MSD组相比，LSD组的回弹性和弹性水平最高。在三组中，血浆葡萄糖，丙氨酸氨基转移酶，天冬氨酸氨基转移酶，胆固醇和肌酐的水平存在显着差异。在HSD组中，鱼的血浆皮质醇水平最高，三碘甲状腺素和甲状腺素水平最低。LSD组放养的鱼肝脏中的超氧化物歧化酶，谷胱甘肽过氧化物酶和过氧化氢酶的活性最高，而谷胱甘肽的含量最高。LSD组放养的鱼类中总抗氧化剂含量最高。结果表明，HSD导致慢性拥挤胁迫，并且对长鳍鲤的生长性能，肌肉质量和抗氧化能力产生负面影响。