Abstract
Aquatic organisms, including fish, accumulate pollutants directly from contaminated water and indirectly via the food chain which probably may cause variation in the way these pollutants affect different trophic level species. Blood parameters have been recognized as valuable tools for monitoring fish health. Haematological and serum biochemical parameters were studied and compared in different trophic level fish species of Parachanna obscura (carnivores), Clarias gariepinus (omnivores) and Oreochromis niloticus (herbivores). Blood parameter revealed low PCV in Oreochreomis niloticus (16.70±1.15%) which significantly varies (P Clarias gariepinus >Oreochromis niloticus. Based on these results, it appears that there are variations in the blood profile of fish as regard their feeding habit as well as physiological effects of anthropogenic activities on fish.
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