Grass carp (Ctenopharyngodon idella) grazing upon aquatic macrophytes and its impact upon rudd (Scardinius erythrophthalmus) reproduction

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12610%2F01%3A00002794" target="_blank" >RIV/60076658:12610/01:00002794 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Grass carp (Ctenopharyngodon idella) grazing upon aquatic macrophytes and its impact upon rudd (Scardinius erythrophthalmus) reproduction

Popis výsledku v původním jazyce

The impacts of grass carp grazing upon aquatic macrophytes nd reproduction of phytophilous cyrpinid, the rudd, were determined during the three-year study. Each of the two fishponds was stocked with 30 individuals of 2+, 3+ and 4+ rudd in April 1998, 1999 and 2000 respectively. In addition, the experimental fishpond was stocked with 10 individuals of two-year-old grass carp (30 kg/ha) in April 2000. In spring 2001, grass carp biomass attained 90 kg/ha. Grass carp grazing pressure reduced the biomass ofthe aquatic macrophytes and influenced their species composition. Biomass values decreased from 108.6 g/m2 in 1998 to 24.1 g/m2 in 2000 in the experimental fishpond but did not change in the control fishpond in 1998 and 1999. Selective grazing of grass carp shifted the dominance of Potamogeton pusillus, Eleocharis acicularis and Cladophora globulina in 1998 to Myriophyllum spicatum, Ceratophyllum demersum, Spirogyra sp., Elodea canadensis and Hydrodictyon reticulatum in 1999-2000. Rudd r

Název v anglickém jazyce

Grass carp (Ctenopharyngodon idella) grazing upon aquatic macrophytes and its impact upon rudd (Scardinius erythrophthalmus) reproduction

Popis výsledku anglicky

The impacts of grass carp grazing upon aquatic macrophytes nd reproduction of phytophilous cyrpinid, the rudd, were determined during the three-year study. Each of the two fishponds was stocked with 30 individuals of 2+, 3+ and 4+ rudd in April 1998, 1999 and 2000 respectively. In addition, the experimental fishpond was stocked with 10 individuals of two-year-old grass carp (30 kg/ha) in April 2000. In spring 2001, grass carp biomass attained 90 kg/ha. Grass carp grazing pressure reduced the biomass ofthe aquatic macrophytes and influenced their species composition. Biomass values decreased from 108.6 g/m2 in 1998 to 24.1 g/m2 in 2000 in the experimental fishpond but did not change in the control fishpond in 1998 and 1999. Selective grazing of grass carp shifted the dominance of Potamogeton pusillus, Eleocharis acicularis and Cladophora globulina in 1998 to Myriophyllum spicatum, Ceratophyllum demersum, Spirogyra sp., Elodea canadensis and Hydrodictyon reticulatum in 1999-2000. Rudd r

Druh

D - Stať ve sborníku

CEP obor

GL - Rybářství

OECD FORD obor

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Projekt

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2001

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

European Congress of Ichtyology

ISBN

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ISSN

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e-ISSN

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Počet stran výsledku

1

Strana od-do

142

Název nakladatele

Praha

Místo vydání

Praha

Místo konání akce

Praha

Datum konání akce

3. 9. 2001

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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