EJPAU 2016. Wolska M. , Mazurkiewicz-Zapałowicz K. , Formicki K. FOOD COMPOSITION AND SELECTIVITY OF JUVENILE PERCH (</i>PERCA FLUVIATILI</i>S L.) AGAINST FOOD RESOURCES IN THE MOUTH OF THE ODRA RIVER

Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.

2016
Volume 19
Issue 1/volume19

Topic:

Fisheries

ELECTRONIC
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES

Wolska M. , Mazurkiewicz-Zapałowicz K. , Formicki K. 2016. FOOD COMPOSITION AND SELECTIVITY OF JUVENILE PERCH (PERCA FLUVIATILIS L.) AGAINST FOOD RESOURCES IN THE MOUTH OF THE ODRA RIVER, EJPAU 19(1/volume19), #05.
Available Online: http://www.ejpau.media.pl/volume19/issue1/volume19/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-Zapałowicz, 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. Królewicza 4
71-550 Szczecin
Poland
email: Maria.Wolska@zut.edu.pl

Kinga Mazurkiewicz-Zapałowicz
Division of Hydrobiology, Ichthyology and Biotechnology of Biotechnology of Reproduction,

West Pomeranian University of Technology in Szczecin, Szczecin, Poland
K. Królewicza 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. Królewicza 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.