In this research it has been targeted to estimate fishable stocks of Karakaya Dam Lake (in Turkey) by using fishing with gillnets method that had been suggested as an alternative method for estimating fish stocks. Productivity per hectare in the dam lake and the amount of fishable stocks has been calculated to be 13.67 kg ha-1 and 312.005 kg year-1, respectively. Fishable stocks have also been analyzed with respect to fish species. According to this, Capoeta sp. is estimated to be 184.107 kg year-1 (8.06 kg ha-1), Cyprinus carpio carpio is estimated to be 56.353 kg year-1 (2.47 kg ha-1), Barbus sp. is estimated to be 40.580 kg year-1 (1.78 kg ha-1), Squalius cephalus is estimated to be 30.455 kg year -1 (1.34 kg ha-1) and Onchorincus mykiss is estimated to be 510 kg year-1 (0.02 kg ha-1).