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Nadpočetný plůdek okouna říčního (Perca fluviatilis L.) v údolní nádrži Vír a jeho vliv na další trofické úrovně / Redundant fingerling of perch (Perca fluviatilis L.) in Vír Reservoir and its impact on other trophic levels

The composition and preferences of depth levels and habitats of pelagic fingerling was studied in the canyon-shaped Vír Reservoir during years 2009-2011. The perch (Perca fluviatilis) fingerling was dominant in all three years. The density of fingerling was above the mean in years 2009 and 2010. It was as many as 278 individuals in 100m3(mean is 52 individuals in 100m3). A marked fall on 1,9 individual in 100m3 was registered in 2011. Perch fingerling was mainly observed in metalimnion during the day and also at night, where concentration of oxygen was very low. The highest density of perch fingerling was observed in the middle part within longitudinal profile. A significant difference was found in food composition among the years with high density and low density of fingerling. A predation of carp (Cyprinus carpio) and bream (Abramis brama) was proved during the years with high density of fingerling.

Identiferoai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:135815
Date January 2012
CreatorsVEJŘÍK, Lukáš
Source SetsCzech ETDs
LanguageCzech
Detected LanguageEnglish
Typeinfo:eu-repo/semantics/masterThesis
Rightsinfo:eu-repo/semantics/restrictedAccess

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