New way to investigate fish density and distribution in the shallowest layers of the open water

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12310%2F21%3A43903649" target="_blank" >RIV/60076658:12310/21:43903649 - isvavai.cz</a>
Alternative codes found
RIV/60077344:_____/21:00553156
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0165783621000357?pes=vor" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0165783621000357?pes=vor</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.fishres.2021.105907" target="_blank" >10.1016/j.fishres.2021.105907</a>

Result language
angličtina
Original language name
New way to investigate fish density and distribution in the shallowest layers of the open water
Original language description
Information about fish distribution and abundance in the upper part of the water column are often fundamental for both research and management. However, this information is extremely hard to obtain using conventional hydroacoustic methods. For this reason, the mobile hydroacoustic upward-looking system (38 kHz split-beam echosounder) in combination with a passive sampling method (gillnets) was tested to investigate the fish community (fish larger than 8 cm total length) in the upper 3 m of water column of the Římov Reservoir (Czech Republic) during the growing season. We found most fish located in the depth layer closest to the surface down to 1 m – 50–78 % by acoustics (layer 0.3; 1 m) and 55-–1 m) and 55–71 % by gillnets. The size structure of both methods was generally similar, but the acoustic results contained a higher proportion of small fish (<12 cm TL). The upward-looking system is a promising approach to study the fish community in the neglected surface layer, but more studies of its efficiency for large fish monitoring are needed. © 2021 Elsevier B.V.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
40103 - Fishery

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>S - Specificky vyzkum na vysokych skolach

Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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