mahdis dabbaghi - Ph.D Research Student, Department of Studies in Earth Science, Manasagangotri, University of Mysore, Mysore 570 006, India.

Although estuaries are proposed as habitats for many maritime fishes’ types, the expansion of human actions and his activities in order to maintain himself quickly has been resulted in losing the life of a variety species of marine organisms and degradation of their living environments inside the estuaries and surrounding areas. With the dominant part of Earth s people living in the seaside ranges, estuarine biological ecosystems have been especially influenced by exacerbated of human activities. One of the objectives of this review was to see how these unsettling influences impress estuarine life forms, especially fishes, shellfish, and oysters. As a basic species of critters available in this world, oysters or other weeny marine organisms give livelihood meal, shelter, nursery natural habitat and numerous imperative things for a vast assortment of other creatures estuarine. Another biologically detrimental severe disorder influencing estuaries is an anthropogenic adjustment of freshwater flow and creating changes in the quality of water designs in terms of saltiness. Since estuaries are territories which connect land to the sea and are situated between freshwater and saltwater, any increase in saltiness mutations through human activities have likewise prompted a serious debasement of oyster reef living environments in rivers. Thus this inquiry is not only containing remonstrative reasons for the protection and attention to the management of littoral rivers by the government, but also it is, for the most part, perceived that general human impedance and usage of stream catchments can considerably affect contrarily on the wellbeing situation, the quality of water, and stylish estimation of estuaries. Hence, the analyst s aim is to attempt a more comprehensive approach with a specific end goal to investigate the degree to which both physical and human effects influence these life supporting frameworks

anthropogenic activities, biological destructive effects, degradation the habitat of sea creatures, quality of water, saltiness, seaside ranges and estuaries