Acoustic data collected during and between bottom trawl stations: consistency and common trends
| Type | Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Date | 2007 | ||||||||
| Language | English | ||||||||
| Author(s) | Bez Nicolas1, Reid David2, Neville Suzanna3, Verin Yves4, Hjellvik Vidar5, Gerritsen Hans D.6 | ||||||||
| Affiliation(s) | 1 : Ecole Mines, F-77305 Fontainebleau, France. 2 : MLA, FRS, Aberdeen AB11 9DB, Scotland. 3 : CEFAS, Lowestoft Lab, Lowestoft NR33 OHT, Suffolk, England. 4 : IFREMER, F-62321 Boulogne Sur Mer, France. 5 : Inst Marine Res, N-5024 Bergen, Norway. 6 : Queens Univ Belfast, DARDNI, Belfast BT9 5PX, Antrim, North Ireland. |
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| Source | Canadian journal of fisheries and aquatic sciences (0706-652X) (NRC), 2007 , Vol. 64 , N. 1 , P. 166-180 | ||||||||
| DOI | 10.1139/F06-174 | ||||||||
| WOS© Times Cited | 7 | ||||||||
| Keyword(s) | gear perturbation, acoustic, Bottom trawl | ||||||||
| Abstract | Acoustic data are often collected during bottom trawl surveys. Their use can potentially improve the precision and accuracy of fish abundance estimates if acoustic data collected between trawl stations are consistent with those collected during trawling operations. This question is addressed here through the analysis of 20 bottom trawl surveys (three survey areas and five different survey series) with coincident acoustic measurements during and between trawl stations. Firstly, on-station and underway acoustic data were compared using statistics computed globally over each survey (average vertical profiles, global indices of collocations, and spatial structures) for various combinations of depth layers. Secondly, we focussed on underway acoustic data recorded in the vicinity of stations, distinguishing between data recorded before and after the tows. On-station and underway acoustic data were highly consistent, and no systematic perturbation of the acoustic sign due to the presence of the gear a few hundred metres behind the vessel was observed. | ||||||||
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