Food Spectrum and Feeding of Barbus cyclolepis Heckel from the Middle Stream of Maritza River (Bulgaria)

D. ROZDINA, G. RAIKOVA-PETROVA, R. MARINOVA and E. UZUNOVA
Sofia University “St. Kliment Ohridski”, Faculty of Biology, Department of Common and Applied Hydrobiology, BG - 1000 Sofia, Bulgaria

Abstract

ROZDINA, D., G. RAIKOVA-PETROVA, R. MARINOVA and E. UZUNOVA, 2008. Food spectrum and feeding of Barbus cyclolepis Heckel from the middle stream of Maritza River (Bulgaria). Bulg. J. Agric. Sci., 14: 209-213

To assess the food spectrum of Barbus cyclolepis altogether 101 specimens were investigated. Food of the barbel consists of 14 food components. The occurrence frequency and the index of dominance were the highest for Chironomid larvae with 78.95% and 42.11% respectively. Plant detritus is established as a significant component in the feeding of the species with 55.79% occurrence frequency and 23.16% index of dominance and is the most important nutrient during the summer season. Variation of index of dominance and fullness index during the year is also investigated. The maximum values of fullness index are established in August (4.8%) and the minimum is in November (0.56%). Feeding activity during the breeding season is decreased. The low value of vacuity index (5.94%) shows good feeding conditions.

Key words: Barbus cyclolepis, nutrition, occurrence frequency, index of dominance, fullness index, vacuity index

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