PELGAS 2017

Name: PELGAS 2017
Start: 2017-04-21
End: 2017-05-25
Location: Bay of Biscay

Type	Oceanographic cruise
Set	This cruise is part of the set PELGAS
Ship	Thalassa
Ship owner	Ifremer
Dates	21/04/2017 - 25/05/2017
Chief scientist(s)	DORAY Mathieu
	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	10.17600/17002000
Objective	The series of PELGAS cruises responds to the need to assess the abundance of small pelagics in the Bay of Biscay, in order to ensure that their fisheries are sustainable. The European Union is cofinancing the PELGAS cruise to ensure that abundance indexes for anchovies and sardines are supplied to the international working groups in charge of assessing these stocks. The second objective of the PELGAS cruises is to monitor the pelagic ecosystem of the Bay of Biscay in springtime. The monitoring aims to provide the scientific elements needed for ecosystem-based management of the Bay's pelagic resources, which are subjected to both natural environmental variations, pressure from fisheries and the climate disturbance caused by human activities. The related project is Ifremer's biological resources and environment programme (RBE), cruise fisheries information system, from the "SIH resources" project's action on observation tools methods, at the Ifremer Ecology and models for fisheries science unit.

Sea/Ocean

Bay of Biscay

English Channel

Ports

Port of departure : Brest (France)

Port of return : Brest (France)

Project

Fisheries Information System (FIS)

Scientific Authority

ÉCOLOGIE ET MODÈLES POUR L'HALIEUTIQUE

Centre Ifremer de Nantes

Rue de l'Ile d'Yeu

44311 Nantes Cedex 3

+33 (0)2 40 37 41 67

Participating bodie(s)

Université de La Rochelle, CNRS

Discipline(s)

CHEMICAL OCEANOGRAPHY
BIOLOGICAL OCEANOGRAPHY
FISHERIES
PHYSICAL OCEANOGRAPHY
TECHNOLOGY

Code	Label	Quantity	PI
B02	Phytoplankton pigments (eg chloroph Sur la CTD et les bouteilles	111 stations	DORAY Mathieu
B07	Pelagic bacteria/micro-organisms Bottles (micro-zooplankton)	672 samples	HURET Martin
B08	Phytoplankton Bottles (chlorophyll)	672 samples	HURET Martin
B09	Zooplankton WP2 (65)	-	HURET Martin
B11	Nekton MIK (12)	-	DORAY Mathieu
B13	Eggs & larvae CUFES	783 samples	HURET Martin
B14	Pelagic fish Pelagic trawls	67	DUHAMEL Erwan
B25	Birds Identification and counting (2349 MN)	-	VAN CANNEYT Olivier
B26	Mammals & reptiles Identification and counting (2349 MN)	-	VAN CANNEYT Olivier
B28	Acoustic reflection on marine organ Single and multibeam echosounder with narrow and wide band (5173 MN)	-	DORAY Mathieu
B64	Gear research Simrad EK80 broadband echosounder	-	DORAY Mathieu
G73	Single-beam echosounding Continuously (5173 MN)	-	DORAY Mathieu
G74	Multi-beam echosounding Continuously (5173 MN)	-	DORAY Mathieu
H09	Water bottle stations	69 stations	HURET Martin
H10	CTD stations Temperature, salinity, fluorescence, turbidity, oxygen, LOPC	111 stations	HURET Martin
H22	Phosphate	69 stations	DORAY Mathieu
H24	Nitrate	69 stations	DORAY Mathieu
H26	Silicate	69 stations	DORAY Mathieu
H28	pH	111 stations	DORAY Mathieu
H71	Surface measurements underway (T,S) Temperature, salinity, fluorescence, continuously (MN 5173)	-	HURET Martin
H76	Ammonia	69 stations	DORAY Mathieu
M06	Routine standard measurements	-	DORAY Mathieu
P01	Suspended matter	69 stations	DORAY Mathieu

Summary of measurements

-Acoustic prospecting (6-frequency single-beam echosounders and multibeam fisheries echosounder) to study the distribution and abundance of small pelagic fish, mainly anchovies and sardines, in the Bay of Biscay.
-Pelagic trawl catches to identify acoustic targets and acquire biological parameters (size distributions, demographics, biological characteristics).
-Egg counts by surface pumping with the CUFES system, coupled with the ZOOCAM: optical recognition system and automatic counting of eggs and mesozooplankton to determine spawning grounds and assess the adult biomass.
-CTD stations and continuous hull-mounted temperature-salinity-fluorimetry measurements to describe abiotic environment and primary production.
-Identification and visual counts of cetaceans and birds present in the area to describe higher predators in the pelagic ecosystem of the Bay of Biscay.
-Testing Simrad EK80 broadband echosounder with the perspective of integrating it when RV Thalassa is upgraded; Calibration and data acquisition.
-Testing a video camera mounted on the bow to count cetaceans.
-Coordinating with 2 professional fishing vessels for the first 18 days of the cruise, making complementary catches along the same track as RV Thalassa.
-Sampling of gelatinous plankton in pelagic trawl catches for the Marine Strategy Framework Directive (MSFD).
-Samples taken of coccolithophorids in a bloom to validate algorithms for satellite data processing.

Location map

Positionning system

Geodetic system : WORLD GEODETIC SYSTEM 1984 = WGS84

Positioning system : GPS différentiel

Published data

Petitgas Pierre, D'Elbée Jean, Pennors Laurence, Bourriau Paul, Marchand Laetitia (2024). Stomach contents of small pelagic fishes in the Bay of Biscay. https://doi.org/10.17882/77966

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

Data managed by SISMER

COMPUTERISED SCIENTIFIC LOGBOOK (1 File)
File	Mission	Processing level	Size	Format
Restricted access 2017002000		RAW DATA	1 GB	Base MySQL CASINO+

DISSOLVED CHEMICALS IN THE WATER COLUMN (1 File)
File	Mission	Processing level	Size	Format
Open access 2017_17002000.bot		DATA CONTROLLED WITH SCOOP	359 KB	MEDATLAS, ODV or NC

FRENCH COASTAL OR LOW RESOLUTION CTD (1 File)
File	Mission	Processing level	Size	Format
Open access 2017_17002000.ctd		DATA CONTROLLED WITH SCOOP	1 MB	MEDATLAS, ODV or NC

METEOROLOGICAL OBSERVATIONS - FRENCH OCEANOGRAPHIC CRUISES (1 File)
File	Mission	Processing level	Size	Format
Open access 201700200045-weather-TL_METBA.met		RAW DATA	26 MB	NetCDF TECHSAS

NATIONAL BANK OF RAW BATHYMETRY : SINGLE-BEAM ECHOSOUNDING (1 File)
File	Mission	Processing level	Size	Format
Restricted access 201700200045-sb_depth-TL_EK500.depth		RAW DATA	26 MB	NetCDF TECHSAS

NAVIGATION - FRENCH OCEANOGRAPHIC CRUISES (1 File)
File	Mission	Processing level	Size	Format
Open access 201700200055.nvi		CONTROLLED DATA	80 MB	NetCDF or Shapefile

UNDERWAY SEA SURFACE SALINITY FROM THERMOSALINOMETER (1 File)
File	Mission	Processing level	Size	Format
Open access 201700200045-hydrology-TL_THSAL.ths		RAW DATA	27 MB	NetCDF TECHSAS

UNDERWAY SEA SURFACE TEMPERATURE BY THERMOMETER (1 File)
File	Mission	Processing level	Size	Format
Open access 201700200045-intake-TL_THSAL.ths		RAW DATA	5 MB	NetCDF TECHSAS

Check all

Bibliography

Publications

Menu Clara, Pecquerie Laure, Bacher Cedric , Doray Mathieu , Hattab Tarek, Van Der Kooij Jeroen, Huret Martin (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/

Grandremy Nina, Romagnan Jean-Baptiste, Dupuy Christine, Doray Mathieu , Huret Martin , Petitgas Pierre (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/

Blanluet Arthur, Doray Mathieu , Berger Laurent , Romagnan Jean-Baptiste, Le Bouffant Naig, Lehuta Sigrid , Petitgas Pierre (2019). Characterization of sound scattering layers in the Bay of Biscay using broadband acoustics, nets and video. Plos One, 14(10), e0223618 (19p.). Publisher's official version : https://doi.org/10.1371/journal.pone.0223618 , Open Access version : https://archimer.ifremer.fr/doc/00588/70035/

References of Technical Reports

Devreker David, Lefebvre Alain (2018). Optimisation du programme de surveillance DCSMM pour les descripteurs 5 - Eutrophisation et 1 - Habitats Pélagiques. Campagnes océanographiques à l'échelle des sous-régions marines. RST/LER.BL/18.06. https://archimer.ifremer.fr/doc/00458/56932/

Baudrier Jerome (2018). Bilan de l’optimisation des campagnes halieutiques réalisée dans le cadre du programme de surveillance de la directive cadre stratégie pour le milieu marin (DCSMM) – année 2017. Rapport scientifique Ifremer ODE/VIGIES/DCSMM. https://archimer.ifremer.fr/doc/00439/55033/

ICES (2018). Working Group on Acoustic and Egg Surveys for Sardine and Anchovy in ICES Areas 7, 8 and 9 (WGACEGG). ICES CM 2017/EOSG:04. https://archimer.ifremer.fr/doc/00465/57656/

Roux Pauline (2017). Caractérisation acoustique des bancs de surface dans le Golfe de Gascogne et implication pour l’évaluation de biomasse. https://archimer.ifremer.fr/doc/00393/50399/

Le Bourdonnec Pierre, Duhamel Erwan , Doray Mathieu (2017). Participation des pêcheurs professionnels à la campagne PELGAS17. 28 avril - 14 mai 2017. Compte rendu des opérations.

Duhamel Erwan , Doray Mathieu , Huret Martin , Sanchez Florence , Lespagnol Patrick, Doremus Gislain, Le Bourdonnec Pierre (2017). Direct assessment of small pelagic fish by the PELGAS17 acoustic survey. Working Document for WGHANSA (Bilbao, 24-29 June.2017). https://archimer.ifremer.fr/doc/00398/50903/

Thesis using campaign data

Grandremy Nina (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.