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