Journals / Turkish Journal of Zoology / 2006 / Cilt: 30 - Sayı: 1
Food and Feeding Habits of the Pikeperch, Sander lucioperca (Linnaeus, 1758), Population from Lake Eğirdir (Turkey)
- Journal
- Turkish Journal of Zoology
- Pages
- 19–26
- DOI
- —
Abstract
The stomach contents of 986 pikeperch, Sander lucioperca (Linnaeus, 1758), collected from Lake Eğirdir in Turkey were investigated between March 2001 and February 2002. Thirteen taxonomic categories were identified from the 1745 prey items analysed. It was determined that the diet of pikeperch in Lake Eğirdir consisted of some fish species (Knipowitschia sp., Aphanius anatoliae anatoliae, Gambusia affinis, Nemacheilus lendli, Carassius gibelio, and Sander lucioperca), odonats (Calopteryx splendens), mysids (Mysis), amphipods (Gammarus) and dipterans (Chironomus). Of these prey categories, fish was more important than the others. In particular, Knipowitschia sp. and A. a. anatoliae were the primary prey for the pikeperch. The proportions of vertebrates and invertebrates in the diet composition of pikeperch in the 150-190 mm length class were found roughly equal. The importance of vertebrates (especially prey fish) in the diet of the pikeperch in Lake Eğirdir increased with increasing body size of fish, but, at the same time, the importance of invertebrates decreased. Pikeperch longer than 300 mm consumed only fish, frogs and odonats. The cannibalism rate was 0.6%. In addition, it was found that the diet of the pikeperch in Lake Eğirdir considerably changed from season to season.
Özet
Bu çal›flmada, Mart 2001 ile fiubat 2002 tarihleri aras›nda E¤irdir Gölü’nden yakalanan 986 sudak, Sander lucioperca (Linnaeus, 1758) örne¤inin mide içeri¤i incelenmifltir. Analiz edilen 1745 besinin 13 taksonomik kategoriye ait olduklar› tespit edilmifltir. Sudak bal›klar›n›n bafll›ca besinlerini; baz› bal›k türleri (Knipowitschia sp., Aphanius anatoliae anatoliae, Gambusia affinis, Nemacheilus lendli, Carassius gibelio, Sander lucioperca), odonat (Calopteryx splendens), mysid (Mysis), amphipod (Gammarus) ve diptera (Chironomus) örnekleri oluflturmufltur. Bu besin kategorilerinden bal›klar, di¤erlerine göre daha önemlidir. Özellikle Knipowitschia sp. ve A. a. anatoliae, E¤irdir Gölü’ndeki suda¤›n en önemli besinleridir. Omurgal› ve omurgas›z organizmalar›n 150- 190 mm boy s›n›f›ndaki sudaklar›n besin kompozisyonundaki oranlar› hemen hemen eflit bulunmufltur. E¤irdir Gölü’ndeki suda¤›n beslenmesinde, omurgal›lar›n (özellikle yem bal›klar›) oran› bal›k büyüklü¤ündeki art›fla ba¤l› olarak artar iken, omurgas›zlar›n önemi azalm›flt›r. Suda¤›n 300 mm’den büyükleri sadece bal›k, kurba¤a ve odonatlar ile beslenmektedirler. Kanibalizm oran› % 0,6 olarak saptanm›flt›r. Ayr›ca, E¤irdir Gölü’ndeki sudak beslenme rejiminin mevsimlere göre önemli oranda de¤iflti¤i belirlenmifltir.