Investigation on monofilament gill net selectivity for vimba (Vimba vimba Linnaeus,1758) in Eʇirdir Lake,Turkey

This study was conducted to determine the selectivity properties of monofilament gill nets for vimba (vimba vimba linnaeus,1758) in eʇirdir lake. select method was used to determine the selectivity parameters. the research area was carried out in three different stations of eʇirdir lake,in a monthly period from january-2009 to december-2009 and with a total of 36 catching trials. in trials,335 vimba species the length ranges between 12.2-44.0 cm were caught. according to the bi- modal model which gave the lowest deviation for nets,the optimum lengths were determined as 12.93,16.16,20.20,24.24,28.28,32.32 and 36.36 cm for 32,40,50,60,70,80 and 90 mm mesh sizes (stretched) in gill net,respectively. as a result,the mesh size of monofilament gill nets should not be less than 50 mm for vimba catching in eʇirdir lake at first maturity. copyright 2015 zoological society of pakistan.