Current Trends in Natural Sciences Vol. 6, Issue 12, pp. 277286, 2017 Current Trends in Natural Sciences (online) Current Trends in Natural Sciences (CDRom) ISSN: 2284953X ISSN: 22849521 ISSNL: 22849521 ISSNL: 22849521 http://www.natsci.upit.ro *Corresponding author, Email address: ekremmutlu@hotmail.com 277 !" ! # #$% & ! %’(# $’# #$ ) 1 Kastamonu University, Faculty of Aquaculture, Kastamonu, Turkey 2 Atatürk University, Faculty of Aquaculture, Erzurum, Turkey 3 University of Pite=ti, Faculty of Sciences, Physical Education and Informatics, Pite=ti, Romania ! " #" $% " $& ’ " (#’)*+ " ’,-’ .,#/0 " 1 &$$$ " " -2 " 3 4 2 1 (3421+ " "! " " 56 ’ 2 3 3 4 * + The protection and appropriate uses of water sources vary depend on sensitivities and awareness of the societies about the water. Nowadays, the factors such as industrialization, increasing population and urbanization, global climate changes, wrong methods used in watering, illegal and unconscious uses, and excessive agricultural activities increase the pressure on protection of water sources. The water limit, which becomes more threatening in both world and Turkey, originates from insufficient amount and quality of the water (Geyikçi and Büyükgüngör, 2010) The lakes, one of the most important fresh water sources, are important places with their natural beauties, biological diversity, and their role in fisheries, tourism, and hydraulic cycle. But the developing technology, rapid increase in population, global climate change, and domestic and industrial and agricultural pollution sources creates a great pressure on the lakes (Ta=, 2011). The dimensions of the pollution in lakes where the flow is limited in proportion to streams are different. Especially in lakes which have no streams flowing out of it, the increasing potential of pollutants such as heavy metals, agricultural pesticides and artificial fertilizer residuals indicates