Campaña: PELMED 2017

Small pelagic fish are both the keystone species of the ecosystem because of the central position they hold in the food chain and represent highly significant economic stakes for fisheries since they make up the majority of landings in the French Mediterranean (approximately 50% of catches for sardines and anchovies; Demaneche et al. 2009). So, to assess stocks and propose appropriate management methods, it is important to have both good knowledge about these species and independent fisheries data. Ifremer's fisheries science laboratory in Sète has monitored these populations since the 1990s. In 2002, the EU asked Member States to formalize certain operations by contract, in this context, the PELMED cruise was part of the extended contractual programme for biomass assessment (DCF). Therefore, each year France is obliged to assess the biomass of small pelagic species in the Mediterranean, in order to determine the stocks' status and propose management measures. These assessments are carried out in the framework of the general fisheries commission for the Mediterranean (CGPM). Since numerous countries had begun monitoring these species using acoustic methods, the MEDIAS (MEDIterannean Acoustic Surveys) scientific group was created in 2008 with the objective of standardizing the protocols. Finally, national management plans for Gulf of Lion fisheries were set up in 2014 (particularly for pelagic trawlers and purse seines) with scientific objectives touching on the biomass of small pelagics. The PELMED cruise, whose main aim is to directly assess the small pelagics biomass, is conducted therefore in a clearly institutional framework (national, European and Mediterranean). However, the scientific stakes remain just as important. Since 2008, a special situation has been observed in the Gulf of Lion, where the biomasses of sardines and anchovies (and even mackerel) have decreased synchronously. Even more unexpectedly, although the recruitment rates observed over the past few years in the species are particularly high, the populations don't seem to be growing back and their biomass is continuing to drop. This is particularly surprising in a marine ecosystem where recruitment is generally considered to be the determining factor of population dynamics for species with a short life span. The collection of biological parameters on species of small pelagics done during the previous PELMED cruises made it possible to highlight significant demographic changes (loss of large age classes, decrease in size, poorer body condition) which seem to suggest "bottom-up" population control. Therefore, the ecosystem-based nature of the PELMED cruises (from physical parameters to top predators, not to mention phyto- and zooplankton and fodder fish) appears to be crucial in understanding the dynamics of these populations. It was decided this year to stop prospecting the Catalan Sea, in order to extend the spatial coverage to the east of the Gulf in the PACA region (from Marseille to Nice). Since the narrowness of the shelf in this zone does not allow for prospecting along "classic" legs, the objective will be to validate a prospection method which is adapted to the area.
 
Citation proposal
. Campaña: PELMED 2017. http://datos.ieo.es/geonetwork/srv/api/records/urn:SDN:CSR:LOCAL:SI29201707010
 

INSPIRE

Identification

File identifier
urn:SDN:CSR:LOCAL:SI29201707010   XML
Hierarchy level
Campaña/Survey Series
Online resource
Protocol
WWW:LINK-1.0-http--related
Protocol
WWW:LINK-1.0-http--related
Resource identifier
code
urn:SDN:CSR:LOCAL:17005300
Metadata language
Spanish; Castilian
Encoding
Format
XML
Version
1
Projection
code
World Geodetic System 84
 

Classification of data and services

Topic category
  • Oceans
 

Classification of data and services

Coupled resource
Coupled resource
 
 

Classification of data and services

Coupled resource
Coupled resource
 
 

Keywords

GEMET - INSPIRE themes, version 1.0 ( Theme )
  • Oceanographic geographical features
SeaDataNet Ports Gazetteer ( departure_place )
  • Sète
SeaDataNet Ports Gazetteer ( arrival_place )
  • Sète
International Standards Organisation countries ( departure_country )
  • France
International Standards Organisation countries ( arrival_country )
  • France
ICES Platform Codes ( platform )
  • L'Europe
SeaVoX Platform Categories ( platform_class )
  • research vessel
SeaVoX salt and fresh water body gazetteer ( Place )
  • Mediterranean Sea, Western Basin
SeaDataNet device categories ( instrument )
  • thermosalinographs
  • single-beam echosounders
  • multi-beam echosounders
  • meteorological packages
  • discrete water samplers
  • CTD
Other keywords
 
 

Geographic coverage

N
S
E
W


 

Temporal reference

Temporal extent
Begin
2017-07-01T00:00:00Z
End
2017-08-03T00:00:00Z
Temporal extent
Date ( Creation )
2017-08-03
 

Quality and validity

Lineage
El Centro de datos aplica controles de calidad estandarizados a todos los datos de los que es responsable. Contacta con el Centro de datos para más información.
 

Conformity

Conformity
Conformity
 

Conformity

Conformity
Conformity
Explanation
See the referenced specification
Explanation
See the referenced specification
 

Restrictions on access and use

Use limitation
Not applicable
Access constraints
 

Restrictions on access and use

 

Responsible organization (s)

Contact for the resource
Organisation name
Ifremer, Station de Sete
Email
sdn-userdesk@seadatanet.org
 

Responsible organization (s)

Contact for the resource
Organisation name
Ifremer, Station de Sete
Email
sdn-userdesk@seadatanet.org
 

Metadata information

Contact for the metadata
Organisation name
Instituto Español de Oceanografía
Email
N/A
Date stamp
2021-11-29
Metadata language
Spanish; Castilian
Character set
utf8 UTF8
 
 

SDS

Conformance class 1: invocable

Access Point URL
Endpoint URL
Technical specification
 

Conformance class 2: interoperable

Coordinate reference system
 
Quality of Service
 
Access constraints
Limitation
 
Use constraints
Limitation
 
Responsible custodian
Contact for the resource
 
 

Conformance class 3: harmonized

 
 

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