MORPHOLOGICAL RELATIONSHIPS, PHYSIOLOGICAL AND OXIDATIVE STRESS RESPONSES OF MALE AND FEMALE AFRICAN SNAKEHEAD (Parachanna obscura Gunther, 1861) FROM EPE LAGOON, LAGOS, NIGERIA
Keywords:
Snakehead fish, Morphology, Blood, Liver tissue, Total antioxidant activityAbstract
Sex-specific oxidative stress response in fish is a widely postulated phenomenon but with limited empirical information on most tropical freshwater fishes. This study was carried out to determine morphological relationships among sexes of Parachanna obscura from Epe Lagoon, Nigeria. It also assessed the physiological and oxidative stress responses of the sexes. Sixty samples of Parachanna obscura were obtained from fishers’ catch and examined for sex, morphometric (18) and meristic (6) characters. Blood samples (?3 ml) were collected from the caudal peduncle vein for haematological analysis. Liver tissues were obtained from male and female samples, homogenized and then assessed for total antioxidant activity (H2O2, CAT, GSH, SOD, GPX, GST, MDA and MPO). Data were analysed using descriptive statistics and t-test analysis. Sexual dimorphism was not markedly visible, while all morphometric parameters and meristic counts were consistent between sexes, except for the weight. Females (169.25±52.58 g) were significantly larger than males (159.44±56.78 g). Blood parameters were not significant different between sexes. In addition, the antioxidants and liver enzymes revealed no sex-related differences in activities. These implies that physiological and oxidative responses to environmental stress were similar for both sexes.
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