Volume 19
Issue 1
Fisheries
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES
Available Online: http://www.ejpau.media.pl/volume19/issue1/abs-05.html
FOOD COMPOSITION AND SELECTIVITY OF JUVENILE PERCH (PERCA FLUVIATILIS L.) AGAINST FOOD RESOURCES IN THE MOUTH OF THE ODRA RIVER
Maria Wolska, Kinga Mazurkiewicz-Zapa這wicz, Krzysztof Formicki
Division of Hydrobiology, Ichthyology and Biotechnology of Biotechnology of Reproduction,
West Pomeranian University of Technology in Szczecin, Szczecin, Poland
ABSTRACT
In the lower reaches of large rivers considerable densities of zooplankton, including large crustaceans, can successfully develop. We studied food composition and selectivity of juvenile Perca fluviatilis. The material was collected near the left bank of the western branch located in the estuarine part of the Odra. Quantitative and qualitative food composition of perch fry caught in June
and July was assessed based on the content of their alimentary tracts. Also zooplankton samples were collected from the water column.
Both in June and July, copepods prevailed in the plankton of the shore zone in the river. In the diet of fry in June, however, the most common were cladocerans, while in July – copepods again. In the diet, the group of cladocerans were dominated by female Daphnia of 1.11 to 1.50 mm in length, whereas in situ smaller Daphnia prevailed. Among copepods, in June, mature stages
were most common; in July, however, juvenile copepodits prevailed. Feeding juvenile perch have a narrow food selectivity. They preferred Daphnia and females of large copepods, avoiding Bosmina, Diaphanosoma, small Thermocyclops, and copepodits.
Key words: zooplankton, food selectivity, fry, perch.
Maria Wolska
Division of Hydrobiology, Ichthyology and Biotechnology of Biotechnology of Reproduction,
West Pomeranian University of Technology in Szczecin, Szczecin, Poland
K. Kr鏊ewicza 4
71-550 Szczecin
Poland
email: Maria.Wolska@zut.edu.pl
Kinga Mazurkiewicz-Zapa這wicz
Division of Hydrobiology, Ichthyology and Biotechnology of Biotechnology of Reproduction,
West Pomeranian University of Technology in Szczecin, Szczecin, Poland
K. Kr鏊ewicza 4
71-550 Szczecin
Poland
email: Kinga.Mazurkiewicz-zapalowicz@zut.edu.pl
Krzysztof Formicki
Division of Hydrobiology, Ichthyology and Biotechnology of Biotechnology of Reproduction,
West Pomeranian University of Technology in Szczecin, Szczecin, Poland
K. Kr鏊ewicza 4
71-550 Szczecin
Poland
email: Krzysztof.Formicki@zut.edu.pl
Responses to this article, comments are invited and should be submitted within three months of the publication of the article. If accepted for publication, they will be published in the chapter headed 'Discussions' and hyperlinked to the article.