EUTROPHICATION a contemporary issue of global world This blog contain answers of flowing question How measurement of dissolved oxygen indicate quality of water and water pollution? we may have seen clear clean flowing stream or pond gets changed into green colur coverd water surface or sometime it even gets changed to marshy land,so how these happend? how polluting river or pond with sweage,agricultural fertilizer and other artifical man made things effects human,domestic animal,tourism fishing revenue? how these pollution decreases fish population in pond? what are physical indicator of eutrophication? how tempr effect types of fish in water body? At first we need to understand dissolved oxygen.It is amount of oxygen dissolved i.e. homogeneously mixed with water and this is the oxygen avilable to aquatic animals inorder to survive i.e. for respiration.This dissolved oxygen is also effected by temperature as water molecules get vibrated on heating so high tempr contain