The food of bream (Abramis brama L.) in two basins of Lake Balaton of different trophic status

Peter Biró, Suhad E. Sadek, Gábor Paulovits

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Abstract

Contrary to earlier observations the food composition of bream (Abramis brama L.) in Lake Balaton has changed in parallel with eutrophication. These changes were probably caused by increased population density and connected with density dependent growth as well as sharpened inter- and intraspecific competition in the cyprinid community. According to the frequency of occurrence, zooplankton followed by benthic invertebrates comprised the majority of the bream's food. By weight, however, benthic food dominated in both basins. Size-related dietary changes were pronounced, but statistically not always significant, suggesting the overall importance of the most abundant and available prey types. Bream did not strongly select any of the zooplankton groups, however, seasonal changes in food composition alternated in parallel with the trophic gradient along the longitudinal axis of the lake.

Original languageEnglish
Pages (from-to)51-58
Number of pages8
JournalHydrobiologia
Volume209
Issue number1
DOIs
Publication statusPublished - Feb 1 1991

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Keywords

  • Lake Balaton
  • bream
  • food composition
  • food selectivity

ASJC Scopus subject areas

  • Aquatic Science

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