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A novel upward-looking hydroacoustic method for improving pelagic fish surveys

R. Baran, T. Jůza, M. Tušer, H. Balk, P. Blabolil, M. Čech, V. Draštík, J. Frouzová, AD. Jayasinghe, I. Koliada, T. Mrkvička, M. Muška, D. Ricard, Z. Sajdlová, L. Vejřík, J. Kubečka,

. 2017 ; 7 (1) : 4823. [pub] 20170706

Language English Country England, Great Britain

Document type Journal Article, Research Support, Non-U.S. Gov't

Persistent link   https://www.medvik.cz/link/bmc19013134

For ethical reasons and animal welfare, it is becoming increasingly more important to carry out ecological surveys with a non-invasive approach. Information about fish distribution and abundance in the upper water column is often fundamental. However, this information is extremely hard to obtain using classical hydroacoustic methods. We developed a rigid frame system for pushing upward looking transducers of the scientific echo sounder (38 and 120 kHz) in front of the research vessel. The efficiency of the new approach for monitoring juvenile fish at night was investigated by comparing the results with a quantitative fry trawl in the Římov Reservoir in the Czech Republic. The experimental setup enabled comparisons for the 0-3 m and 3-6 m depth layers, which are utilized by almost all juvenile fish in summer. No statistically significant differences in the estimated abundance of juveniles were found between the two sampling methods. The comparison of abundance estimates gathered by the two frequencies were also not significantly different. The predicted mean lengths from acoustic sampling and the trawl catches differed by less than 10 mm in all comparisons. Results suggest that mobile hydroacoustic upward-looking systems can fill the methodological gap in non-invasive surveying of surface fishes.

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$a Baran, Roman $u Institute of Hydrobiology, Biology centre of the Czech Academy of Sciences, České Budějovice, Czech Republic. Faculty of Science, University of South Bohemia, České Budějovice, Czech Republic.
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$a A novel upward-looking hydroacoustic method for improving pelagic fish surveys / $c R. Baran, T. Jůza, M. Tušer, H. Balk, P. Blabolil, M. Čech, V. Draštík, J. Frouzová, AD. Jayasinghe, I. Koliada, T. Mrkvička, M. Muška, D. Ricard, Z. Sajdlová, L. Vejřík, J. Kubečka,
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$a For ethical reasons and animal welfare, it is becoming increasingly more important to carry out ecological surveys with a non-invasive approach. Information about fish distribution and abundance in the upper water column is often fundamental. However, this information is extremely hard to obtain using classical hydroacoustic methods. We developed a rigid frame system for pushing upward looking transducers of the scientific echo sounder (38 and 120 kHz) in front of the research vessel. The efficiency of the new approach for monitoring juvenile fish at night was investigated by comparing the results with a quantitative fry trawl in the Římov Reservoir in the Czech Republic. The experimental setup enabled comparisons for the 0-3 m and 3-6 m depth layers, which are utilized by almost all juvenile fish in summer. No statistically significant differences in the estimated abundance of juveniles were found between the two sampling methods. The comparison of abundance estimates gathered by the two frequencies were also not significantly different. The predicted mean lengths from acoustic sampling and the trawl catches differed by less than 10 mm in all comparisons. Results suggest that mobile hydroacoustic upward-looking systems can fill the methodological gap in non-invasive surveying of surface fishes.
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$a Balk, Helge $u Institute of Hydrobiology, Biology centre of the Czech Academy of Sciences, České Budějovice, Czech Republic. Department of Physics, University of Oslo, Oslo, Norway.
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$a Muška, Milan $u Institute of Hydrobiology, Biology centre of the Czech Academy of Sciences, České Budějovice, Czech Republic.
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$a Ricard, Daniel $u Institute of Hydrobiology, Biology centre of the Czech Academy of Sciences, České Budějovice, Czech Republic. Fisheries and Oceans Canada, Gulf Fisheries Centre, Moncton, Canada.
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$a Sajdlová, Zuzana $u Institute of Hydrobiology, Biology centre of the Czech Academy of Sciences, České Budějovice, Czech Republic.
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$a Kubečka, Jan $u Institute of Hydrobiology, Biology centre of the Czech Academy of Sciences, České Budějovice, Czech Republic. kubecka@hbu.cas.cz.
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