Department of Aquaculture and Fisheries, University of Ilorin, Ilorin, Kwara State, Nigeria.
Department of Agricultural Education, Kwara State College of Education, Ilorin, Kwara State, Nigeria.
Trop Anim Health Prod. 2021 Nov 11;53(6):541. doi: 10.1007/s11250-021-02989-5.
This study evaluated the effect of Mitracarpus scaber leaves extract (MSLE) as a dietary supplement on growth performance, physiological, antioxidants, and mucosal immune profiles of North African catfish, Clarias gariepinus, and resistance to Edwardsiella tarda infection. Four isonitrogenous diets containing 0, 2, 4, or 6 MSLE g/kg were fed to North African catfish fingerlings (n = 240; mean weight = 5.80 g) for 56 days. After the feeding trial, 10 fish from each experimental tank were intraperitoneally injected with E. tarda (ATCC 15,947; 1.0 × 10 CFU/mL) while clinical signs and mortalities were observed for 14 days. The results show that North African catfish fed dietary MSLE had better growth performance, physiological antioxidants, and mucosal immune profiles than when fed a control diet. The best growth, physiological, antioxidant, and mucosal immune response profiles were noticed in the fish fed diet containing 6 MSLE g/kg. Furthermore, fish fed 6 MSLE g/kg diet had a higher survival rate after E. tarda infection. These results indicated that supplementation of MSLE at 6 g/kg improves growth, physiological, antioxidant, and mucosal immune profiles, and promotes resistance of North African catfish.
本研究评估了 Mitracarpus scaber 叶提取物（MSLE）作为膳食补充剂对北非鲶鱼（Clarias gariepinus）生长性能、生理、抗氧化和黏膜免疫特性的影响，以及对爱德华氏菌感染的抵抗力。将含有 0、2、4 或 6 MSLE g/kg 的四种等氮饲料喂养北非鲶鱼苗（n = 240；平均体重 = 5.80 g）56 天。喂养试验结束后，将每个实验组的 10 条鱼用爱德华氏菌（ATCC 15,947；1.0 × 10 CFU/mL）进行腹腔注射，观察 14 天临床症状和死亡率。结果表明，与对照组相比，摄食 MSLE 饲料的北非鲶鱼生长性能、生理抗氧化和黏膜免疫特性更佳。摄食含 6 MSLE g/kg 饲料的鱼表现出最佳的生长、生理、抗氧化和黏膜免疫应答特征。此外，摄食 6 MSLE g/kg 饲料的鱼在爱德华氏菌感染后的存活率更高。这些结果表明，补充 6 MSLE g/kg 的 MSLE 可提高北非鲶鱼的生长、生理、抗氧化和黏膜免疫特性，并促进其对爱德华氏菌的抵抗力。
