Eutrophication comes from the Greek word “eutrophos” meaning well-fed. In other words, this natural process present in water results from the supply of additional rich nutrients that promote plant production. Currently, eutrophication is causing global devastation not only to aquatic life, but also to the fishing industry. The release of nutrients into freshwater lakes, rivers and reservoirs results in excessive growth of three different plant species: a) open water algae (phytoplankton) b) fixed algae (periphyton) c) higher plants (macrophytes) These Above all, organisms encourage the growth of algae, which absorb dissolved oxygen in the water, essential for the survival of fish populations. Sometimes the decomposition of newly submerged biomass and sediment further reduces the oxygen content of the water. Water sources can literally be choked to death by increased human activity, such as industry and agriculture, which leads to increased nutrient loading. I am particularly surprised to see how the agricultural industry inflicts these problems on itself, through overuse of sewage systems and pollutants finding their way into local rivers [Fig. 1.]. The trophic state (i.e. natural nutrition factors) and biodiversity of lakes and rivers are strongly affected by the main nutrients involved, nitrates and phosphates. The transition occurs primarily between a mesotropic state, with average biological productivity, and a eutrophic state where there is greater production of organisms due to high nutrient concentrations. Tropical reservoirs in particular often become eutrophic. Impacts on water quality Contaminants acting as nutrients for plants in excessive concentrations, overcompensate by forming...... middle of paper ...... the fish industry for example has been beaten, in terms of annual pollution. income and available resources. Norwegian organizations have been forced to spend millions of pounds on nutrient control programs in order to resolve their excess fertility. Despite this, we should not completely remove all nutrients from our ecosystems. Mesotropic conditions are ideal because they will provide sufficient water. It can be said that similar methods can be used elsewhere for other biological problems such as the acidification of ecosystems where acid rain, due to sulfur dioxide, dissolves aluminum salts in rivers and lakes, which suffocates the fish. After studying these different aspects, I think that eutrophication is a very important and often neglected issue. Continuing, without reducing systems, could lead to despair for our environment and indirectly affect farmers around the world..