Depth integrated abundance of plankton and fish, expressed as Nautical Area Scattering Coefficient (NASC) determined from acoustics measurements at 38 kHz during R/V Håkon Mosby cruise IMR-2009615 on Transect 2009-06-14T16:55

The objective of the IMR-2009615 cruise was to study the distribution of fish and plankton in relation to the occurrence of Lophelia cold-water coral reefs and the general topography in the Traena Deep coral reef field. The acoustic data were collected using the Simrad ER60 scientific echosounder at a cruising speed of 10 knots. Abundance estimations of fish were generated for the 38 kHz data. Three other operating frequencies were used during the survey (18, 120 and 200 kHz) for trace recognition purposes. Echograms were scrutinized using Large Scale Survey System-software. The allocation of area backscattering strengths to species was made by comparison of the appearance of the echo recordings to trawl catches and video recordings. This dataset contains depth integrated values from four hundred and sixteen (416) vertical profiles of plankton and fish abundance expressed as Nautical Area Scattering Coefficient (NASC) determined from acoustics measurements at 38 kHz. Abundances expressed as NASC (meter square per nautical mile square) can be converted to numbers of individuals using "target strength to length" relationships for the targeted species/group. For single species these relationships can be determined through in situ measurements of target strength during the survey and the size distribution of the insonified fish. The number of fish (N) in a particular area can be calculated using standard equations, e.g. Foote et al. (1987), Toresen et al. (1998), Roa-Ureta and Nikilitschek (2007).

Identifier
DOI https://doi.org/10.1594/PANGAEA.756317
PID https://hdl.handle.net/10013/epic.36575.d001
Related Identifier IsDocumentedBy https://hdl.handle.net/10013/epic.36574.d001
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.756317
Provenance
Creator Fosså, Jan Helge; Kutti, Tina (ORCID: 0009-0007-1242-474X); Bergstad, Odd Aksel ORCID logo; Knutsen, Tor ORCID logo; Svellingen, Ingvald; Wangensten, Jarle; Johannessen, Reidar; Steinsland, Asgeir
Publisher PANGAEA
Contributor Institute of Marine Research, Bergen
Publication Year 2011
Funding Reference Seventh Framework Programme https://doi.org/10.13039/100011102 Crossref Funder ID 213144 https://cordis.europa.eu/project/id/213144 Ecosystem based management of corals, fish and fisheries in the deep waters of Europe and beyond
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Resource Type Dataset
Format text/tab-separated-values
Size 616 data points
Discipline Earth System Research
Spatial Coverage (10.793W, 66.883S, 10.838E, 66.984N); Traena Deep
Temporal Coverage Begin 2009-06-12T16:55:24Z
Temporal Coverage End 2009-06-12T17:45:48Z