Seasonal variations usually affect aquatic life in one way or another. This study evaluated the influence of season on haematological parameters of male and female Heterobranchus bidorsalis. Fish samples were collected in two seasons; rainy and dry season in the months of July, August, September (rainy season) and November, December, January (dry season). Collection was made from three different stations (A, B and C), landing sites along River Rima of Sokoto State, Nigeria. Haematological parameters were analyzed automatically using Erma Particle Counter. The results obtained in respect to stations and seasons were; Haematological parameters; WBC, LY, LY%, RBC, Hgb, HCT, MCV, MCH, MCHC and MPV show significant difference at P <0.05 in some parameters. But all the results indicated that the Heterobranchus bidorsalis was healthy.
Keywords: Season, heamatological parameters, heterobranchus bidorsalis, sex
