Volume : 3, Issue : 6, June - 2014

Effects of Water Borne Iron on Toxicity and Path Physiology of Indian Major Carp––A Review

Biraj Bikash Sharma, Gadadhar Dash, Sk. Sahanawaz Alam, Debajit Chakraborty

Abstract :

Extensive studies have been carried out for the influences of toxic metals on aquatic organisms worldwide. Ferrous iron is considered to be the most toxic form of iron (Fe). Indian major carps (IMC) are most important cultured species in India and it is essential to protect them against metal toxicity. Several studies have been taken up for spawn and fry whereas in case of fingerlings it is scanty. Among the IMC spawn, Mrigal showed least tolerance to Fe followed by Catla and Rohu. In case of Catla fingerling highest mortality was observed at 13 mg l–1 and 15 mg l–1 concentrations. Rohu fingerlings had the lowest mean LC50 concentration for 30–days fish, followed by 60 and 90–days respectively. Physiological evidences indicated that ferrous form of Fe preferentially crosses the apical memane of both gill and intestine (Ilavazhahan et al., 2010). Accumulation of Fe in liver and kidney was highest in case of Rohu fry compared to Catla and Mrigal. Mrigal showed highest accumulation of Fe in muscle followed by Catla and Rohu. Among spawn, Catla growth was affected most by the Fe concentration followed by Mrigal and Rohu (Debnath, 2011)