This study was designed to evaluate the effects of dietary crawfish shell meal (CSM) on the growth performance, digestive enzyme activity and anti-oxidative capacity of Oujiang color common carp. 180 juvenile fish (initial weight 3.0 ± 0.5 g) were assigned to the control group and the CSM25 group (fed with 25% substitution of fish meal by CSM) for 8 weeks. Results showed that significant improvement in the weight gain rate (WGR) in CSM25 group than the control (p < .05), whereas no significant change in feed conversion ratio, specific growth rate and feeding intake between the groups (p > .05). Also, no significant difference was obsevered between the groups in terms of serum biochemical index and muscle composition (p > .05). And liver superoxide dismutase, catalase, glutathione peroxidase (GPx), lysozyme (LYZ) and protease activities in CSM25 group were significantly higher (p < .05). Moreover, histological analysis indicated that width of mucosa and thickness of muscular coat in mid-intestine were significantly changed (p < .05). In conclusion, dietary supplement with CSM25 induced high oxidative stress, promote protease activities and had no negative effects on the growth performance of Oujiang color common carp. Hence, CSM may be a viable alternative protein source to reduce the demand for fish meal.

中文翻译：

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用小龙虾壳粉（Procambarus clarkii）替代鱼粉蛋白对瓯江色鲤（Cyprinus carpio var. color）生长性能、消化酶活性和抗氧化能力的影响

本研究旨在评估日粮小龙虾壳粉（CSM）对瓯江彩鲤生长性能、消化酶活性和抗氧化能力的影响。180 条幼鱼（初始体重 3.0 ± 0.5 g）被分配到对照组和 CSM25 组（用 CSM 替代 25% 的鱼粉喂养）8 周。结果表明，CSM25 组的增重率（WGR）较对照组显着提高（p  < .05），而各组间饲料转化率、比生长率和采食量没有显着变化（p  > .05） . 此外，在血清生化指标和肌肉成分方面，各组之间没有观察到显着差异（p > .05）。CSM25组肝脏超氧化物歧化酶、过氧化氢酶、谷胱甘肽过氧化物酶（GPx）、溶菌酶（LYZ）和蛋白酶活性显着升高（p  < .05）。此外，组织学分析表明，中肠粘膜的宽度和肌层的厚度发生了显着变化（p  < .05）。综上所述，日粮添加CSM25诱导高氧化应激，促进蛋白酶活性，对瓯江彩鲤的生长性能没有负面影响。因此，CSM 可能是一种可行的替代蛋白质来源，以减少对鱼粉的需求。