Abstract
birey/m 2 , Keban bolgesinde 1.37 birey/m 2 ve Cemisgezek bolgelerinde 1.40 birey/m 2 olarak Abstract: The investigation of the crayfish (Astacus leptodactylus Eschscholtz, 1823) population amplitude in Keban dam lake In this study, the crayfish (Astacus leptodactylus Eschscholtz, 1823) population amplitude in Keban Dam Lake was investigated. For prediction of population amplitude marking and many counting method (Schnabel Method) was used. The study was carried out in the stations deter- mined in Agin, Keban and Cemisgezek regions of Keban Dam Lake. The catching amount of unit effort was calculated as 0.93 individual crayfish/pinter/7 days. The crayfish densities were predicted as 1.82 individual/m 2 in Agin region and 2.08 individual/m 2 in Keban and Cemis- gezek regions. Total stocks were determined as 2198560 individuals in Agin region, 2672800 individuals in Keban region and 4799142 individuals in Cemisgezek region, due to weight 58482 kg in Agin region, 71096 kg in Keban region and 127657 in Cemisgezek region. The densities of catchable length of crayfish (≥ 9 cm) were determined as 1.17 individual/m 2 in Agin region, 1.37 individual/m 2 in Keban region and 1.40 individual/m 2 in Cemisgezek region.
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