Biomass and abundance at length of small pelagic fish estimated during the PELGAS survey in the Bay of Biscay in springtime

Date 2021-08-03
Temporal extent 2000 -2017
Author(s) Doray MathieuORCID1, Duhamel Erwan1, Sanchez FlorenceORCID1, Grellier Patrick1, Pennors Laurence1, Petitgas Pierre1
Affiliation(s) 1 : Ifremer, France
DOI 10.17882/53388
Publisher SEANOE
Keyword(s) small pelagic fish, biomass, abundance, length, size, Bay of Biscay, fisheries acoustics, midwater trawl, anchovy, sardine, horse mackerel, Atlantic mackerel, boarfish, blue whiting, sprat, Atlantic chub mackerel

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, 2017a).

This dataset comprises the biomass (in metric tons) and abundance (in thousands of individuals) at length (in cm) of small pelagic fish estimated during the PELGAS survey in the Bay of Biscay in springtime. Total biomass and abundance per species on one hand, and frequencies-at-lenght per species and acoustic Elementary Distance Sampling Units (EDSUs) on the other hand, have been derived from fisheries acoustic and midwater trawl data based on the methodology described in Doray et al. (2010). Frequencies-at-lenght per species and EDSUs have been averaged over the survey area for each species and multiplied by the total biomass and abundance per species, to derive global biomass and abundance at length estimates. This dataset was used in Doray et al., 2017b.

Licence CC-BY-NC-SA
Utilisation Data are published without any warranty, express or implied. The user assumes all risk arising from his/her use of data. Data are intended to be research-quality, but it is possible that these estimates or the data themselves contain errors. It is the sole responsibility of the user to assess if the data are appropriate for his/her use, and to interpret the data accordingly. Authors welcome users to ask questions and report problems.
Acknowledgements PELGAS surveys have been funded by the European Common Fishery Policy Data Collection Framework through the European Maritime and Fisheries Fund, the Marine Strategy Framework Directive, and Ifremer. We want to acknowledge the joint efforts of R/V Thalassa crews and PELGAS scientists that made the survey possible.
Sensor metadata

Sensors metadata are described in Doray et al., (2014, 2017a)

File Size Format Processing Access Key
203 KB CSV Quality controlled data Access on demand 54251
Readme 704 bytes TEXTE Open access 54256
2000-2019 data (last updated version) 237 KB CSV Quality controlled data Open access 86953
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How to cite 

Doray Mathieu, Duhamel Erwan, Sanchez Florence, Grellier Patrick, Pennors Laurence, Petitgas Pierre (2021). Biomass and abundance at length of small pelagic fish estimated during the PELGAS survey in the Bay of Biscay in springtime. 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. Publisher's official version : , Open Access version :