Abstract:
The changes in the total and differential leucocyte count in the fish Clarias albopunctatus exposed to sublethal concentrations of actellic 25 EC (0, 0.3, 0.5, 08 and 1.0 μg/l) were studied for 18 days in a static renewal bioassay system. Compared wth the control, there was significant leucocytosis (P<0.05) in the actellic -exposed fish. The total leucocyte counts also differed significantly (P <0.05) in the treatment groups. The lymphocytes were the dominant leucocyte subgroup in the blood of the fish. There was significant lymphocytosis in the actellic 25 EC-exposed fish. Decreased eosinophils, monocytopenia and neutropenia were evident in the treatment groups. These observations are indications of the mobilization of the body’s defense system due to Actellic25 challenge leading to leucopoiesis.
