Feeding Ecology of Various Length-Classes of Brown Trout (Salmo trutta) in Different Streams of Coruh River, Turkey

Ozvarol Z. A. B., Yildirim A., ÖZVAROL Y.

KAFKAS UNIVERSITESI VETERINER FAKULTESI DERGISI, cilt.17, sa.3, ss.377-382, 2011 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 17 Sayı: 3
  • Basım Tarihi: 2011
  • Dergi Adı: KAFKAS UNIVERSITESI VETERINER FAKULTESI DERGISI
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, TR DİZİN (ULAKBİM)
  • Sayfa Sayıları: ss.377-382
  • Anahtar Kelimeler: Diet composition, Brown trout, Salmo trutta, Length, Coruh River, Turkey, SELECTIVITY, GAIRDNERI, SALAR, SIZE, FISH, FOOD
  • Akdeniz Üniversitesi Adresli: Evet

Özet

In the present study, It was investigated a variation in food consumption by brown trout Salmo trutta, of different sizes and streams of Coruh river, Turkey. The diet of 277 brown trout individuals were described for the purpose of registering the number and frequency of prey objects per fish, and their selection of invertebrate fauna by electroshock between August 2008 - July 2009. Samples of invertebrate fauna were also gathered from the stream bottom. Trichoptera was the most abundant organism in all streams for brown trout. The diet of brown trout included 20 types of organisms, with Trichoptera as the most consumed taxa. Each length class of fish consumed different prey taxa. The most important and preferable food item varied among the length classes of the brown trout. In the fish 3-11.9 cm and 12-20.9 cm fed chiefly on Trichoptera (Limnephilus sp.), Saltatoria (Tetrix sp.) and Trichoptera (Sericostomata sp.), respectively. In the fish >21 cm fed on Ephemeroptera (Epeorus alpicala), Diptera (Simulium sp.) and Saltatoria (Tetrix sp.). In conclusion, this study had shown that brown trout fed on a variety of prey items, and the diet and feeding behaviour changes by habitat and fish size.