Sinusoidal cycling swimming pattern of reservoir fishes.

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077387%3A_____%2F02%3A62023112" target="_blank" >RIV/60077387:_____/02:62023112 - 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
Sinusoidal cycling swimming pattern of reservoir fishes.
Original language description
A circular transducer fixed on the bottom close to the deepest point of the Rimov Reservoir and beaming up towards the surface showed that most fishes stayed in the epilimnion during the summer. The majority of larger fish in open water performed characteristic sinusoidal movements in the vertical plane during July and August days. As they crossed the sonar beam, the fish changed their depth several times. Fish started to swim up-and-down after sunrise and continued doing so during daytime. The sinusoidal movement pattern was replaced by direct movement before sunset. Variation of target strength indicates active changes of fish tilt in transient phases of the sinusoidal cycle rather than changes of swim bladder volume. Up-and-down fish swimming is likely to be an efficient way of visual inspecting a larger volume of the epilimnion for prey - large zooplankton, whose epilimnetic density in the reservoir is low and patchy in summer time.
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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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year
2002
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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