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¹ Firat University, Fisheries Faculty, Elazıg, Turkey
² Eğirdir Fisheries Research Institute, Eğirdir, Isparta, Turkey DOI : 10.4194/1303-2712-v15_4_08 Viewed : 5316 - Downloaded : 5628 The aim of this study was to determine the relationship between spinner hook sizes (2, 3 and 4) and hook selectivity for Oncorhynchus mykiss (rainbow trout), a species important to recreational fisheries in Karakaya Dam Lake in Eastern Turkey. A total of 24 sampling trips were carried out twice per month by the same three anglers from May 2013 to April 2014. The SELECT method was used to determine the selectivity parameters. An analysis to determine the differences in the catch per unit effort (CPUE), yield per unit effort (YPUE) and condition factor values based on different hook sizes was conducted using one-way ANOVA. During the spinner hook-size experiments, we captured 202 Oncorhynchus mykiss, which ranged from 14.5 cm to 46.0 cm TL in length and weight 30.2 g to 1320.2 g. The mean lengths (± SE) of Oncorhynchus mykiss captured on the three spinner hook sizes were determined. The optimum length and spread values calculated by log-normal model were found to be 18.28, 27.41 and 36.55 cm for Nr2, Nr3 and Nr4 hook sizes, respectively. Keywords : hook selectivity, rainbow trout, Oncorhynchus mykiss, catchefficiency, Karakaya Dam Lake