Gölköy Gölü’nde (Bolu-Türkiye) Yaşayan Üç Sazangil Türünün Beslenme Alışkanlıkları ve Asimilasyon Etkinlikleri

Yıl 2006, Cilt: 2 Sayı: 1, - , 04.01.2006

Hakan Turker

Öz

Gölköy gölünde yaşayan üç sazan türünün (Tinca tinca (L.), Cyprinus carpio L. ve Carassius carassius (L.)) beslenme alışkanlıkları ve asimilasyon etkinlikleri araştırılmıştır. Sazangillerin beslenme analizleri için dijital ortamda alan tahmin metodu kullanılmıştır. Sazan türlerinin yıl boyunca beslenmeleri tekdüze olmayıp diyetler organik döküntü, bitki ve hayvan materyalleri, diatomlar ve filament algleri içermiştir. Sazangillerin beslenme kompozisyonunun mevsimsel olarak değiştiği gösterilmiştir. Genel olarak üç sazan türü içinde; yüksek oranda organik döküntü kış aylarında, bitki materyalleri de yaz aylarında bulunmuştur. Kadife balığının, T. tinca, besini yazın yüksek oranda diatomlar, kabuklular ve alglerdir. Sazan balığının, C. carpio, besini yaz ve sonbahar aylarında yüksek oranda bitki materyalleri ve kabuklular içermesine rağmen, havuz sazanı, C. carassius, Ağustos ayından Kasım ayına kadar alg tüketir. Gölköy gölündeki sazangillerde sindirimin belirteci olarak kullanılan kül ile tahmin edilen asimilasyon etkinliği de mevsimler olarak değişmiştir. Kadife balıklarının diatomlarla, sazan balıklarının bitki materyalleri ve havuz sazanlarının da alglerle beslendikleri zamanlarda asimilasyon etkinlikleri daha yüksek olarak tahmin edilmiştir

Anahtar Kelimeler

Beslenme alışkanlığı, asimilasyon etkinliği, Gölköy Gölü, sazangiller

The Feeding Habits and Assimilation Efficiencies of Three Cyprinid Species in Lake Gölköy (Bolu-Turkey)

Öz

The feeding habits and assimilation efficiencies of three cyprinid species (Tinca tinca (L.), Cyprinus carpio L. and Carassius carassius (L.)) living in Lake Gölköy were studied. Digitalized area estimation method was used to analyze for the diet of cyprinids. The diets of cyprinid species were not uniform throughout the year, consisting of detritus, plant and animal materials, diatoms and filamentous algae. The results of this study demonstrated that the diet composition of the cyprinids ranged among the seasons. Generally in three cyprinid species, a high percentage of organic detritus were found in autumn months and a high percentage of plant materials in summer months. The food of tench, T. tinca, was high level of diatoms, crustaceans and algae in summer. Although the food of common carp, C. carpio, consisted of high level of plants materials and crustaceans during summer and autumn months, the Crucian carp, C. carassius, ingested mainly algae from August to November. Estimation of assimilation efficiency by using ash as a marker of digestion in cyprinids also varied seasonally in Lake Gölköy. Higher assimilation efficiency was estimated when tench fed on diatoms, common carp on macrophytes and the Crucian carp on algae

Anahtar Kelimeler

Feeding habit, assimilation efficiency, Lake Gölköy, cyprinids

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