Yeniçağa (Bolu) Gölü'ndeki Kerevitlerin (Astacus leptodactylus) Bazi Dokularindaki Ağir Metal Birikimi *

The aim of this study is to determine the difference of accumulation for some heavy metals (Cd, Cr, Mn, Pb) in the tissues of crayfish. A total of 30 crayfish has been caught at different times. One-Way ANOVA and Mann Whitney U test were performed to test the significance of the difference of heavy metal contents among crayfish tissues. It was detected that Mn had the highest accumulation in all tissues. The accumulation of Cr is highest at the gills (P<0.05). Cd and Mn had the highest accumulation ratio in gills and significant differences were found among all tissues. Pb accumulation was highest in exo-skeleton. This accumulation is significantly different compared to all other tissues in favor of exo-skeleton and the accumulation between muscle tissue and gills is significant too.