Seasonal Variation of Zooplankton Population with Reference to Water Quality of Iril River in Imphal

The zooplankton population of Iril river of Imphal valley of Manipur was investigated with reference to water quality. The fish biodiversity potential of the river remain intake despite the sub-urban exposure of the river. Since plankton play a great food chain role for fish community, knowing the population of zooplankton as secondary resource is needed. Deterioration of water quality in urban area remain, in most cases, a basic feature. The present investigation endeavour to establish the influence, if any, of water quality of a river in sub-urban settings to the zooplankton population. Five sites were selected stretching from upstream before the river enter the urban area to the downstream as the river exit the urban area. Since the river is in suburb and for some special physical features the Iril river maintain a significant volume and there seems to be dilution effect and pollution of the river remain a lesser concern. Nevertheless, the study establishes possible influences of the change in water quality to plankton population