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Turkish Journal of Fisheries and Aquatic Sciences 2017, Vol 17, Num, 7     (Pages: 1373-1380)

The Stock Assessment of Crayfish (Astacus leptodactylus Eschscholtz, 1823) in the Keban Dam Lake

Ferhat Demirol 1 ,Fahrettin Yuksel 2 ,Fatih Gunduz 1 ,Abdulmutalip Beri 1 ,Mehtap Guler 3 ,Tacettin Yildirim 1 ,M. Zulfu Coban 4

1 Fisheries Research Institute, 23000, Elazığ, Turkey
2 University of Munzur, Faculty of Fisheries, 62000, Tunceli, Turkey
3 Directorate of District Food Agriculture and Livestock, Avcılar, Istanbul, Turkey
4 University of Fırat, Faculty of Fisheries, 23119, Elazığ, Turkey
DOI : 10.4194/1303-2712-v17_6_30 Viewed : 1077 - Downloaded : 970 In this study, estimating of catchable stock size, stock density and the amount of annual allowable catches of crayfish population in the Keban Dam Lake was aimed. The Schnabel Method, one of the multiple marking methods, was used to estimate crayfish stock size. The caught crayfish were branded by an electric soldering iron. Mean weight of crayfish that have the minimum allowable length (TL≥10 cm) was detected as 41 g and catch per unit effort (CPUE) was calculated to be 0.13 crayfish/fyke-net/day both 2012 and 2013. It was determined that the density of crayfish that have greater than (or equal to) total length of 10 cm was 0.91 individual per m2 for 2012 and 1.07 individual per m2 for 2013. Accordingly, the biomass of crayfish that have minimum landing size (TL≥10 cm) was estimated to be 80258 kg for 2012 and 74671 kg for 2013. The total amount of annual allowable catch in the Keban Dam Lake was estimated at 26.7 tons. For individual regions it reached: 7.1 tons for Ağın, 6 tons for Keban, 7.7 tons for Çemişgezek and 5.9 tons for Ova fishing regions. Keywords : Mark-recapture, schnabel method, stock density, CPUE