Mean length and weight at-age of anchovy and sardine estimated during the PELGAS survey in the Bay of Biscay in springtime

Date 2022
Temporal extent 2000 -2021
Author(s) Doray MathieuORCID1, Duhamel Erwan2, Boiron-Leroy AnneORCID4, Marchand Laetitia5, Bled--Defruit Geoffrey3, Petitgas Pierre1
Affiliation(s) 1 : Ifremer, EMH, Nantes, France
2 : Ifremer, LTBH, Lorient, France
3 : Ifremer, HMMN, Boulogne, France
4 : Ifremer, EMMA, La Tremblade, France
5 : Ifremer, MASAE, Nantes, France
DOI 10.17882/88357
Publisher SEANOE
Keyword(s) weight, length, Bay of Biscay, fisheries acoustics, midwater trawl, anchovy, sardine

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., (2018a, 2021).

This dataset comprises the mean length-at-age (cm) and weight-at-age (g) estimated annualy since 2000 for anchovy and sardine, based on PELGAS survey data. Both indices were weighted by fish abundance per length class, and are provided with an estimation error (coefficient of variation in %). Indices were produced following a standard methodology implemented in the EchoR R package (Doray et al. 2013).

Those estimates have been validated by the ICES WGACEGG group and provided to the ICES WGHANSA group for stock assessment purposes. Data have been used in Doray et al., 2018b.

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

Sensor metadata are described in Doray et al., (2018a, 2021).

File Size Format Processing Access
Anchovy and sardine mean weight and length at age, PELGAS survey 57 KB CSV Quality controlled data Open access
Description of anchovy and sardine mean weight and length at age file headers 1 KB CSV Open access
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How to cite 

Doray Mathieu, Duhamel Erwan, Boiron-Leroy Anne, Marchand Laetitia, Bled--Defruit Geoffrey, Petitgas Pierre (2022). Mean length and weight at-age of anchovy and sardine 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 :