A novel upward-looking hydroacoustic method for improving pelagic fish surveys
Abstract 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 o...
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2017
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oai:doaj.org-article:de1ad605b554427bbd6ed767f6e623682021-12-02T16:08:23ZA novel upward-looking hydroacoustic method for improving pelagic fish surveys10.1038/s41598-017-04953-62045-2322https://doaj.org/article/de1ad605b554427bbd6ed767f6e623682017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04953-6https://doaj.org/toc/2045-2322Abstract 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.Roman BaranTomáš JůzaMichal TušerHelge BalkPetr BlabolilMartin ČechVladislav DraštíkJaroslava FrouzováAsanka D. JayasingheIevgen KoliadaTomáš MrkvičkaMilan MuškaDaniel RicardZuzana SajdlováLukáš VejříkJan KubečkaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-12 (2017) |
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Medicine R Science Q Roman Baran Tomáš Jůza Michal Tušer Helge Balk Petr Blabolil Martin Čech Vladislav Draštík Jaroslava Frouzová Asanka D. Jayasinghe Ievgen Koliada Tomáš Mrkvička Milan Muška Daniel Ricard Zuzana Sajdlová Lukáš Vejřík Jan Kubečka A novel upward-looking hydroacoustic method for improving pelagic fish surveys |
| description |
Abstract 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. |
| format |
article |
| author |
Roman Baran Tomáš Jůza Michal Tušer Helge Balk Petr Blabolil Martin Čech Vladislav Draštík Jaroslava Frouzová Asanka D. Jayasinghe Ievgen Koliada Tomáš Mrkvička Milan Muška Daniel Ricard Zuzana Sajdlová Lukáš Vejřík Jan Kubečka |
| author_facet |
Roman Baran Tomáš Jůza Michal Tušer Helge Balk Petr Blabolil Martin Čech Vladislav Draštík Jaroslava Frouzová Asanka D. Jayasinghe Ievgen Koliada Tomáš Mrkvička Milan Muška Daniel Ricard Zuzana Sajdlová Lukáš Vejřík Jan Kubečka |
| author_sort |
Roman Baran |
| title |
A novel upward-looking hydroacoustic method for improving pelagic fish surveys |
| title_short |
A novel upward-looking hydroacoustic method for improving pelagic fish surveys |
| title_full |
A novel upward-looking hydroacoustic method for improving pelagic fish surveys |
| title_fullStr |
A novel upward-looking hydroacoustic method for improving pelagic fish surveys |
| title_full_unstemmed |
A novel upward-looking hydroacoustic method for improving pelagic fish surveys |
| title_sort |
novel upward-looking hydroacoustic method for improving pelagic fish surveys |
| publisher |
Nature Portfolio |
| publishDate |
2017 |
| url |
https://doaj.org/article/de1ad605b554427bbd6ed767f6e62368 |
| work_keys_str_mv |
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