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Background Sexual dimorphism in metabolic and oxidative stress markers of Clarias gariepinus and Heterobranchus longifilis found in southwest Nigeria was investigated. C. garepinus and H. longifilis broodstock weighing 2.54 ± 0.12 and 2.11 ± 0.15 kg consisting of 20 males and females each per species were sourced from southwest Nigeria. Fishes conditioned conditioning for breeding, blood samples were collected, and serum obtained to assess metabolic and oxidative stress indices using standard procedures. Results The results obtained show that serum albumin, triglyceride, low-density lipoprotein, alanine aminotransferase, and total antioxidant activity of Clarias garepinus were significantly ( p < 0.05) higher than Heterobranchus longifilis . Superoxide dismutase of males was significantly ( p < 0.05) superior to females in both species. The total antioxidant activity of males was significantly ( p < 0.05) superior to females in Heterobranchus longifilis . Serum catalase, glutathione peroxidase and lipid peroxidation were not affected by sex and species differences. Superoxide dismutase activity and some non-enzyme antioxidants could account for superior total antioxidant activity in males despite similar lipid peroxidation. Conclusion Catfish broodstocks of Heterobranchus longifilis possess superior total antioxidant activity than Clarias gariepinus owing to its superior non-enzyme antioxidants fraction. In both clariid species, males have better antioxidant defence than females.

journal of basic and applied zoology /journal of basic and applied zoology

Sexual dimorphism, metabolic, and oxidative stress markers of African catfish (Clarias garepinus and Heterobranchus longifilis) broodstock in Southwest Nigeria