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Haematological responses of African snakehead ( Parachanna obscura ) to petroleum products exposure and subsequent recovery

This investigation examined changes in some haematological parameters (Blood haemoglobin and Neutrophil) in juveniles of African Snakehead ( Parachanna obscura ) exposed to 1.00, 2.00, 4.00 and 8.00ml concentrat ions of some petroleum products (PMS, DPK and LBO). Blood haemoglobin and neutrophil levels showed significant increases duri ng toxicity and recovery in de-chlorinated tap water. The changes i n the fish blood haemoglobin during toxicity sugges t responses to improve blood O 2 carrying capacity following possible blood erythro cytes disintegration which arose from stress due to the petroleum products. The significant increases in neutrophil l evels suggest gill tissue damage and the fish immun ological defense responses against bacterial infection during toxicity. The ch anges during recovery reflect compensatory physiolo gical mechanism for the survival of the fishes.