This study was conducted in three different locations (kopru, barla and hoyran) of Lake EÃÂirdir from March 2001 to February 2002, to investigate spatial distributions of economic fish populations in the lake. Whit this aim, fish populations were sampled monthly using by 5 gillnets of mesh sizes varying between 36 and 40 mm, and 5 trammel nets of mesh sizes varying between 56 and 140 mm. In fishing operations, individuals belonging to silver crucian carp (Carassius gibelio (Bloch, 1782)), pikeperch (Sander lucioperca (Linnaeus, 1758)), vimba (Vimba vimba Linnaeus, 1758) and carp (Cyprinus carpio Linnaeus, 1758) were caught. It was determined that pikeperch for kopru and barla regions and silver crucian carp for hoyran region of the lake were dominant. In terms of spatial distributions of fish species, similarity was rather high between kopru and barla sampling sites, while it was low between hoyran and the other sampling sites. In addition, the mean weight and length of samples were decreased gradually from South to North for silver crucian carp, while increased for pikeperch and vimba.
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