STUDY OF ABIOTIC FACTORS ACROSS THE BRAHMAPUTRA BELT IN RELATION TO ITS SUITABILITY FOR AQUATIC LIFE

A healthy ecosystem is a result of balanced interaction between biotic and abiotic factors.Water temperature, pH, DO, FCO2, TA, TH etc are the most important abiotic factors influencing the physico-chemical and biological events of water body (Rahman et al., 2008).All species have their own optimal range for these abiotic parameters.In relation to aquatic life, there maturation time is also dependent on these parameters.These factors have great influence on aquatic life (DuttaMunshi and DuttaMunshi, 1995).This paper deals with the observation of fluctuation of these abiotic factors across the Brahmaputra Belt and its relation with aquatic life, mostly fishes.