PELGAS 2019

Type Oceanographic cruise
Set This cruise is part of the set PELGAS
Ship Thalassa
Ship owner Ifremer
Dates 25/04/2019 - 26/05/2019
Chief scientist(s) DORAY Mathieu ORCID, DUHAMEL Erwan ORCID

ÉCOLOGIE ET MODÈLES POUR L'HALIEUTIQUE

Centre Ifremer de Nantes

Rue de l'Ile d'Yeu

BP 2105

44311 Nantes Cedex 3

+33 (0)2 40 37 41 67
DOI 10.17600/18001109
Objective

The PELGAS sea cruises aim at monitoring the Bay of Biscay pelagic ecosystem, in order to provide scientific data for the implementing of an ecosystemic management of Biscay living ressources. The spatial and temporal dynamics of small pelagic fish populations are specifically monitored, with a focus on anchovy and sardine populations. The cruise hence takes place in spring, when both species are spawning, to allow for the assessment of both eggs and adult stages.

The PELGAS ecosystemic cruise aims at collecting data at each level of the Biscay pelagic trophic chain. Data are collected continuously along parallel transects covering the whole Bay of Biscay, in order to thoroughly characterize the horizontal and vertical structures of the pelagic ecosystem. Multibeam and multifrequency echosounders provide real time information on the spatial patterns and abundance of pelagic organisms ranging from plankton to fish. Simultaneously, a Continuous Fish Egg Sampler provide complementary data on small pelagic fish eggs. The presence and abundance of seabirds and marine mammals are also continuously recorded.

Acoustic targets are punctually identified by fishing (pelagic trawling and plankton nets). CTD stations are actually performed over the whole Bay of Biscay to provide hydrological information. In situ measurements are compared to satellite and hydrodynamic models outputs.

The PELGAS cruise is part of the "Fisheries Information System" implemented by the "Biological and Environmental Resources" Ifremer department. Data are collected within the EU Data Collection Regulation framework and are used to assess the anchovy and sardine stocks within the ad-hoc International Council for the Exploration of the Sea (ICES) working groups. The sea cruise is internationally coordinated with Spanish, Portuguese and English cruises within the ICES WGACEGG working group. The survey also collects data on nutrients useful for descriptor D5 of the Marine Strategy Framework Directive. The numerous parameters collected during the PELGAS sea cruises will actually provide indicators to assess the good ecological state of the Biscay pelagic ecosystem, within the framework of the new EU directive.

 

Published data

Petitgas Pierre, Doray Mathieu, Boyra Guillermo, Duhamel Erwan, Sobradillo Bea, Martinez Urdane (2023). Maps of sardine and anchovy length distributions in the Bay of Biscay in spring and autumn. https://doi.org/10.17882/92818


Grandrémy Nina, Bourriau Paul, Danielou Marie-Madeleine, Doray Mathieu, Dupuy Christine, Forest Bertrand, Huret Martin, Le Mestre Sophie, Nowaczyk Antoine, Petitgas Pierre, Pineau Philippe, Rouxel Justin, Tardivel Morgan, Romagnan Jean-Baptiste (2023). PELGAS Bay of Biscay ZooCAM zooplankton Dataset (2016-2019). https://doi.org/10.17882/94040


Data managed by SISMER

Bibliography

Publications

Grandremy NinaORCID, Romagnan Jean-Baptiste, Dupuy Christine, Doray MathieuORCID, Huret MartinORCID, Petitgas PierreORCID (2023). Hydrology and small pelagic fish drive the spatio–temporal dynamics of springtime zooplankton assemblages over the Bay of Biscay continental shelf. Progress In Oceanography, 210, 102949 (18p.). Publisher's official version : https://doi.org/10.1016/j.pocean.2022.102949 , Open Access version : https://archimer.ifremer.fr/doc/00813/92490/


Menu ClaraORCID, Pecquerie Laure, Bacher CedricORCID, Doray MathieuORCID, Hattab Tarek, Van Der Kooij Jeroen, Huret MartinORCID (2023). Testing the bottom-up hypothesis for the decline in size of anchovy and sardine across European waters through a bioenergetic modeling approach. Progress In Oceanography, 210, 102943 (20p.). Publisher's official version : https://doi.org/10.1016/j.pocean.2022.102943 , Open Access version : https://archimer.ifremer.fr/doc/00812/92434/


References of Technical Reports

Maillard De La Morandais Jeanne (2024). Compréhension de la variabilité temporelle de la croissance chez la sardine du golfe de Gascogne (Sardina pilchardus). Rapport de stage. Licence professionnelle : Métiers de la Protection de la Gestion de l’Environnement – Environnement Marin, Ressources et Gestion. Université du Littoral Cote d'Opale.


Doray MathieuORCID, Duhamel ErwanORCID (2023). PELGAS2023: acoustic biomass estimation of small pelagic fish near sea surface in the Bay of Biscay. ICES WGACEGG 2023 WD. https://doi.org/10.13155/97276


Doray MathieuORCID, Coulon Noémie, Huret MartinORCID, Le Bouffant Naig, Berger LaurentORCID (2020). Did acoustic miss much spawning anchovy surface schools in the Bay of Biscay in spring 2019 ? WGACEGG2020 Working Document. https://archimer.ifremer.fr/doc/00662/77412/


Coulon Noémie (2020). Bancs de surface de petits poissons pélagiques dans le Golfe de Gascogne : implication pour l’évaluation de la biomasse. Rapport de Stage de Master Sciences de la Mer 1ère année. Université Sorbonne. https://archimer.ifremer.fr/doc/00641/75282/


Lecordier Enora (2019). Bancs de surface de petits poissons pélagiques dans le Golfe de Gascogne : caractérisation et implications pour l’évaluation de biomasse.


Thesis using campaign data

Panetier Aurélie (2023). Shipborne Global Navigation Satellite Systems for Offshore Atmospheric Water Vapor Monitoring. PhD Thesis, ENSTA Bretagne.


Grandremy NinaORCID (2023). Dynamiques spatio-temporelles du zooplancton, en lien avec l’habitat et les petits poissons pélagiques, dans le Golfe de Gascogne. PhD Thesis, Université de Nantes.