Sule Kayrak, Selda Tekin Ozan
The present study was carried out to detect the levels of heavy metals in water, sediment and tissues of tench (Tinca tinca) in Kovada Lake, Turkey. Water, sediment and fish samples were collected from September 2012 to February 2013 at different three sites. DORM 3, DOLT 4 and HISS 1 reference material showed good accuracy. As a result of analysis in water, all of the metals except Pb were determined in water. Fe was the highest and Cd was the lowest in water. Kovada Lake's water was classified as category I according to the standards Ministry of Forestry and Water Management. All of the metals were determined in sediment and fish tissues, and Fe was the highest and Cd was the lowest in sediment. The highest metal levels were found in liver compared with gill and muscle. No significant relationships were determined between metal levels in fish with fish weight and lenght. The metal levels which were detected in fish tissues was compared with acceptable levels for fish tissues given by World Health Organization, European Commission and Turkish Standart Institute. This study shows that a potential danger may occur in the future depending on the agricultural development.