Biotic data collected during identification trawls on the PELGAS integrated survey in the Bay of Biscay

The Pélagiques Gascogne (PELGAS, Doray et al., 2000) integrated survey aims at assessing the biomass of small pelagic fish and monitoring and studying the dynamics and diversity of the Bay of Biscay pelagic ecosystem in springtime. PELGAS has been conducted within the EU Common Fisheries Policy Data Collection Framework and Ifremer’s Fisheries Information System. Details on survey protocols and data processing methodologies can be found in Doray et al., (2014, 2018).

This dataset comprises the abundance (no. of individuals), biomass (metric tons), mean length (cm), mean weight (g) of marine organisms collected by midwater trawling to identify fish echoes detected during PELGAS surveys (2000-2018). All parameters have been raised to the trawl haul level. Trawl haul metadata and species reference list are also provided.


Fisheries and aquaculture


integrated survey, midwater trawl, pelagic, Bay of Biscay


48.708403N, 40.457753S, 0.173522E, -7.915473W


Identification hauls have been carried out using the R/V Thalassa II 2 doors, headline: 76 m foot rope: 70 m (or 57 m x 52 m at depths below 50 m) pelagic trawls (cf. Brabant and Nedelec, 1988 for detailed plans). Since 2007, a consort survey has been routinely organized together with French pairs trawlers which accompanied R/V Thalassa for approximatively 20 days, to conduct supplementary identification hauls (Massé et al., 2016). Trawl hauls have been typically conducted in straight line for about 30 minutes at 3 knots.

See PELGAStotalSamplesReadme.csv file for fields description.




PELGAS biotic trawl data
251 KoCSVProcessed data
How to cite
Doray Mathieu, Pennors Laurence, Grellier Patrick, Raguenes Pierre, Lespagnol Patrick, Duhamel Erwan (2019). Biotic data collected during identification trawls on the PELGAS integrated survey in the Bay of Biscay. SEANOE.
In addition to properly cite this dataset, it would be appreciated that the following work(s) be cited too, when using this dataset in a publication :
Doray Mathieu, Petitgas Pierre, Romagnan Jean-Baptiste, Huret Martin, Duhamel Erwan, Dupuy Christine, Spitz Jerome, Authier Matthieu, Sanchez Florence, Berger Laurent, Doremus Ghislain, Bourriau Paul, Grellier Patrick, Masse Jacques (2018). The PELGAS survey: ship-based integrated monitoring of the Bay of Biscay pelagic ecosystem. Progress In Oceanography. 166. 15-29.,

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