Age, growth, sex ratio and diet of eastern mosquitofish Gambusia holbrooki Girard, ۱۸۵۹ in Seyhan Dam Lake (Adana/Turkey)

The aim of this study is to provide necessary information on the biology of mosquitofish in Seyhan Dam Lake in Adana, which is located in southern part of Turkey. The population structure of eastern mosquitofish Gambusia holbrooki Girard, ۱۸۵۹ was studied in Seyhan Dam Lake. A total of ۱۵۸۲ specimens (۷۷۲ males and ۸۱۰ females) were collected monthly from January to December, ۲۰۰۷. The age composition of the sample range between ۰+ and ۲+in both sexes. The sex ratio was M:F= ۱:۱.۰۴. The length-weight relationship calculated for all individuals, with W=۰.۰۱۲۹ x L۲.۹۲۷. von Bertalanffy growth parameters were for males, L∞=۳.۳۱cm, K=۰.۶۵۹۷ year-۱, to =۰.۹۴۸۳ year for females L∞=۶.۶۲cm, K=۰.۲۳۶۹ year-۱, to =۰.۹۲۵۹ year for all samples, L∞=۵.۸۴cm, K=۰.۲۳۶۹ year-۱, to =-۱.۰۷۴۰ year. A total of ۱۰۲ stomachs were examined and total of organisms identified from alimentary canal. The diet mainly consist of Diptera (Chironomidae (pupa) ۲۹.۴۰% Diptera (adult) ۲۴.۵۰%), Egg (mosquito ۱۴.۷۰% different organisms ۱.۹۶%), Crustacea (Copepoda ۹.۸۰%, Cladocera ۳.۹۲%), Coleoptera ۴.۹۰%, Hemiptera ۱.۹۶%, Fishes (G. holbrooki ۳.۹۲%), Other Hymenoptera ۱.۹۶%, Tricoptera ۰.۹۸%, Plecoptera ۰.۹۸%, Formicidae ۰.۹۸%. These data were conducted to compare with the results of other studies to carry out for other geographic areas.

کلیدواژه ها:

Mosquitofish ، Gambusia holbrooki ، Life history ، Seyhan Dam Lake ، Turkey