Citation:

essd-7-35-2015

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Abstract:

Acoustic and pelagic trawl data were collected during various pelagic surveys carried out by IFREMER in May between 2000 and 2012 (except 2001), on the eastern continental shelf of the Bay of Biscay (Pelgas series). The acoustic data were collected with a Simrad EK60 echosounder operating at 38 kHz (beam angle at -3 dB: 7°, pulse length set to 1.024 ms). The echosounder transducer was mounted on the vessel keel, at 6 m below the sea surface. The sampling design were parallel transects spaced 12 nm apart which were orientated perpendicular to the coast line from 20 m to about 200 m bottom depth. The nominal sailing speed was 10 knots and 3 knots on average during fishing operations. The scrutinising (species identification) of acoustic data was done by first characterising acoustic schools by type and then linking these types with the species composition of specific trawl hauls. The data set contains nautical area backscattering values, biomass and abundance estimates for blue whiting for one nautical mile long transect lines. Further information on the survey design, scrutinising and biomass estimation can be found in Doray et al. 2012.

Further details:

Doray, Mathieu; Massé, Jacques; Petitgas, Pierre (2012): Pelagic fish stock assessment by acoustic methods at Ifremer. https://archimer.ifremer.fr/doc/00003/11446/

Project(s):

Basin Scale Analysis, Synthesis and Integration (EURO-BASIN)

Funding:

Seventh Framework Programme (FP7), grant/award no. 264933 : Basin Scale Analysis, Synthesis and Integration

Coverage:

Median Latitude: 46.064293 * Median Longitude: -3.018139 * South-bound Latitude: 43.660000 * West-bound Longitude: -6.310000 * North-bound Latitude: 49.060000 * East-bound Longitude: -1.230000

Date/Time Start: 2000-04-18T05:25:00 * Date/Time End: 2012-05-23T20:10:00

Event(s):

PELGAS2000_ER60 * Latitude Start: 43.660000 * Longitude Start: -1.460000 * Latitude End: 47.950000 * Longitude End: -4.690000 * Date/Time Start: 2000-04-18T05:25:00 * Date/Time End: 2000-05-14T07:04:00 * Location: Bay of Biscay * Campaign: * Basis: Thalassa * Method/Device: (ER60)

PELGAS2002_ER60 * Latitude Start: 43.660000 * Longitude Start: -1.520000 * Latitude End: 47.850000 * Longitude End: -5.410000 * Date/Time Start: 2002-05-10T06:55:00 * Date/Time End: 2002-06-06T15:08:00 * Location: Bay of Biscay * Campaign: * Basis: Thalassa * Method/Device: (ER60)

PELGAS2003_ER60 * Latitude Start: 43.660000 * Longitude Start: -1.500000 * Latitude End: 48.060000 * Longitude End: -5.270000 * Date/Time Start: 2003-05-30T09:33:00 * Date/Time End: 2003-06-24T10:59:00 * Location: Bay of Biscay * Campaign: * Basis: Thalassa * Method/Device: (ER60)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event
2	DATE/TIME	Date/Time				Geocode
3	LATITUDE	Latitude				Geocode
4	LONGITUDE	Longitude				Geocode
5	Micromesistius poutassou abundance as Nautical Area Scattering Coefficient	M. poutassou NASC	m²/nmi²	Doray, Mathieu	Interpreted values
6	Micromesistius poutassou, biomass	M. poutassou biom	kg/km²	Doray, Mathieu	Calculated from nautical area scattering coefficient
7	Micromesistius poutassou, abundance	M. poutassou abund	#/km²	Doray, Mathieu	Calculated from nautical area scattering coefficient

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

61275 data points

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