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¹ Eğirdir Fisheries Research Institute, Eğirdir, Isparta, Turkey DOI : 10.4194/1303-2712-v14_4_09 Viewed : 5400 - Downloaded : 4524 The aim of this study was determine the selectivity of gillnet and trammel net with different mesh sizes for C. gibelio in Eğirdir Lake. Gillnets with mesh sizes of 32, 40, 50, 60, 70, 80 and 90 mm; and trammel nets with of 100, 110, 120, 130 and 140 mm were tested for catching of C. gibelio. Fieldwork was carried out in two different station of Eğirdir Lake, in a monthly period from December 2009 to April 2010 and with a total of 10 catching trials. The SELECT method was used to determine the selectivity parameters. Number of 592 C. gibelio species were caught in the experiments which the lengths ranged between 7.3 - 34.8 cm. According to the Bi-modal model which gave the lowest deviation for multifilament gillnets, the optimum lengths were determined as 8.74, 10.92, 13.65, 16.38, 19.11, 21.84 and 24.57 cm for 32, 40, 50, 60, 70, 80 and 90 mm mesh sizes respectively. According to the Normal scale model which gave the lowest deviation for trammel nets, optimum lengths were determined as 27.20, 29.92, 32.64, 35.36 and 38.08 cm for 100, 110, 120, 130 and 140 mm mesh sizes in trammel net respectively. Keywords : Gillnet, trammel net, selectivity, SELECT method, Carassius gibelio