Volume 8
Issue 2
Fisheries
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES
Available Online: http://www.ejpau.media.pl/volume8/issue2/abs-34.html
FOOD SELECTION OF PELED LARVAE (COREGONUS PELED GMEL.), REARED IN ILLUMINATED CAGES IN DIFFERENT WATER BODIES
Grażyna Furgała-Selezniow, Andrzej Mamcarz, Andrzej Skrzypczak
Department of Lake and River Fisheries,
University of Warmia and Mazury in Olsztyn, Poland
ABSTRACT
The aim of the experiment was to examine prey size selection of peled (Coregonus peled Gmel.) larvae using Strauss linear index for food selection. For this purpose larval peled were held in illuminated cages at two stocking densities (10 000 and 40 000 individuals per cage) in three water bodies of diverse trophic characteristics. In the first days of rearing peled larvae fed on zooplankton up to 0.5 mm in length. Then most peled larvae significantly more often selected organisms up to 1 mm, which were most abundant in the environment. Under good feeding conditions, reared fish selected medium-sized zooplankters (from 0.6-1.0 mm length class, less often those 1.0-1.5 mm in length). Stronger food pressure for small prey appeared at a time of poor feeding conditions. Fish fed rather randomly on larger planktonic organisms (>1.5 mm), which were not abundant in the environment. Statistically significant differences were observed in food selection between the cages with different stocking densities, even when the feeding preferences were similar. Large variability in the feeding behaviour of peled larvae was observed during the whole rearing period.
Key words: peled larvae, food selection, Strauss linear index of food selection, cage rearing..
Grażyna Furgała-Selezniow
Department of Lake and River Fisheries,
University of Warmia and Mazury in Olsztyn, Poland
M. Oczapowskiego 5, 10-957 Olsztyn, Poland
phone +48 89 523 33 88,
fax +48 89 523 39 69
email: graszka@uwm.edu.pl
Andrzej Mamcarz
Department of Lake and River Fisheries,
University of Warmia and Mazury in Olsztyn, Poland
M. Oczapowskiego 5, 10-957 Olsztyn, Poland
phone +48 89 523 33 88,
fax +48 89 523 39 69
email: mamcarz@uwm.edu.pl
Andrzej Skrzypczak
Department of Lake and River Fisheries,
University of Warmia and Mazury in Olsztyn, Poland
M. Oczapowskiego 5, 10-957 Olsztyn, Poland
phone +48 89 523 33 88,
fax +48 89 523 39 69
email: sandacz@uwm.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.