Akademik Veri Yönetim Sistemi
JOURNAL OF FOOD AGRICULTURE & ENVIRONMENT, cilt.9, sa.1, ss.451-456, 2011 (SCI-Expanded)
We documented a variation in food consumption and the composition of the stomach contents of brown trout (Salmo trutta) in different habitats of the Coruh River, in Turkey. The research was conducted seasonally, at five streams, between August 2008 and July 2009. The diet of 277 brown trout was described for the purpose of registering the number, weight and frequency of prey objects per fish. Analysis of variations in stomach fullness indicated that feeding intensity was higher in the Stream Mulk and in individuals between 4.5-7.5 cm and 22.5 cm. A total of 3116 individual preys were counted from the 277 brown trout examined. The diet of trout included 20 types of prey, with Trichoptera (27.79%) and Saltatoria (19.49%) being the most consumed taxa. The most representative preys were Limnephilus sp. (48.729%), Simulium sp. (11.10%), Leptocerus sp. (7.32%), Epeorus alpicola (6.64%) and Sericostoma sp. (6.64%). By weight, Tetrix sp. (47.78%) represented the largest proportion of the diet, followed by Epeorus alpicola (13.24%), Sericostoma sp. (11.48%) and Leptocerus sp. (8.23%). The index of relative importance (IRI%) revealed that Trichoptera (38.65%) and Saltatoria (34.82%) were of greater importance than the other prey categories (26.53%). Tetrix sp. had the highest index score (IRI 34.82%), followed by Limnephilus sp. (IRI 28.38%) Sericostoma sp. (IRI 8.68%), Leptocerus sp. (IRI 7.54%) and Simulium sp. (IRI 7.4%). The results of this study indicate that stream dwelling brown trout feed on a variety of prey items, and their diet and feeding behavior vary according to habitat.