Author(s): Samuel Vinod Kumar, Little Flower Pascal, Samuel Tennyson, Muniyasamy Pandeeswari, Kalyanasundaram Dhinamala, Deepa Persis, Rajasingh Raveen, Subramanian Arivoli and Mohamed Meeran

Abstract: Aquatic organisms may take up pollutants from sediments, water, suspended particle and food items. Non-lethal exposure of fishes to pollutant results in various biochemical consequences. Effect on enzymes, level of steroids and haematological properties has received particular attention. Effects of sub-lethal level of pollutants also include changes in tissue architecture and various physiological processes, including sensory responses, ciliary and motor activity, metabolism, osmotic and ionic regulation, endocrine function, growth, respiration, reproduction and development, histological, neuromuscular and genotoxic parameters ^[1]. Haematological parameters have been used to describe the health of a fish ^[2], monitor stress response and predict systematic relationship and physiological adaptations. They more quickly reflect the poor condition of fish than other commonly measured parameters ^[3]. Haematological parameters are increasingly used as indicators of physiological stress response to endogenous or exogenous changes in fish. Haematological changes in some fishes exposed to various toxicants have been studied in Tilapia mossambicus ^[4], Ctenopharyngodon idella ^[5], Oncorhynchus mykiss ^[6] and Salmo trutta fario ^[7]. Therefore, in the present study, the haematological effects caused to Anabas testudineus on exposure to aquatic toxicants present in the Buckingham canal, Chennai, Tamil Nadu, India were investigated.

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