Grass carp (Ctenopharyngodon idella) grazing on duckweed (Spirodela polyrhiza).

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12220%2F03%3A00004893" target="_blank" >RIV/60076658:12220/03:00004893 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Grass carp (Ctenopharyngodon idella) grazing on duckweed (Spirodela polyrhiza).
Original language description
The aims of this experiment were (1) to quantify the ability of grass carp to process duckweed and (2) to assess indirect changes in water chemistry and phytoplankton community, caused by grass carp feeding. Yearlings of grass carp sized 126 # 7.7 mm (TL) and 19.6 g in weight were kept in 9 laminate tanks of 1 m3 for 14 days. Two stocking densities (2 and 6 fish per m3) and control without fish were used. Standard growth rate (SGR) of grass carp fed exclusively on duckweed was 0.70 % body weight (BW) d-1 and food conversion ratio (FCR) reached 2.0 (average water temperature = 21.1 # 3.8 °C). Daily food intake was 0.2 g of duckweed dry weight (DW), i.e., 1 % of average BW of grass carp. SGR of duckweed growing in 20 x 20 cm floating enclosures, differedsignificantly [F(6,2) = 417.9; p = 0.002] between the two stocking densities of grass carp and the control tanks (without fish). Mean SGR of duckweed was 0.02 g g-1 day-1 and the highest SGR was recorded in the control tanks. Both decreas
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
EH - Ecology - communities
OECD FORD branch
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Publication year
2003
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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