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The diet of 0+ perch and pikeperch - some of aspects of transition from plaktivory to piscivory Potrava 0+ okouna a candata - nektere aspekty prechodu od planktivorie k piscivorii


Bulletin VURH Vodnany. cervenec-zari; 413: 99-106
The diet of 0+ perch and pikeperch - some of aspects of transition from plaktivory to piscivory Potrava 0+ okouna a candata - nektere aspekty prechodu od planktivorie k piscivorii
Size-related changes in diet of perch (Perca fuviatilis L.) and pikeperch (Sander lucioperca L.) were studied throughout their first year of life until the fly reached about 30 mm SL. In general, ontogenetical changes in diet were similar in both species. Smallest larvae (K 9.5 mm SL) consumed predominantly nauplii and copepodite instars of cyclopoid and calanoid copepods. Rotifers played minor role, especially when evaluating their biomass contribution, but in very low numbers occurred also in the diet of pikeperch larger than 20 mm SL. Cladocerans - Daphnia galeata and Diaphanosoma brachyurum appeared already in the diet of the smallest fry, but their importance increased once the fry reached about 15 mm SL and from that body length especially Daphnia spp. were the most important part of the diet of both species. Even in the largest fry group no piscivorous perch or pikeperch were reported. In the second part of the study pikeperch piscivory is discussed on an example of case study of its ponds culturing. The difference (the significance of skewness) in length frequency distribution at the end of growing season between ponds with (p < 0, 05, 0,01 respectively) and without (p < 0,05) prey fish (stone moroko, Pseudorasbora parva Temminck & Schlegel) were reported From the point of view of mass production of similarly size-structured yearlings, culturing with prey fish seems to be highly negative due to size diversification (bimodality reported) and negative effect of induced piscivory with consequences in intracohort cannibalism.

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Accession: 038746659



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