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Aggregation patterns of pelagic commercial fish species under different stock situations and their impact on exploitation and assessment

Objective

Extraction of school parameters. The objective is to extract school parameters from echo sounder echograms of historical acoustic surveys.

This consists in
(i) defining a list of school parameters significant for achieving the ecological objectives and
(ii) implementing protocols for the extraction of the school parameters adapted to the different acoustic surveys.

Standardisation. The objectives are
(i) analyse the sensitivity of school parameters to equipment settings,
(ii) analyse the sensitivity of school parameters to school depth,
(iii) propose new corrections for the length of school sections
(iv) propose a common echo integration threshold to be applied by all partners for replay of historical digital acoustic data and
(v) analyse the sensitivity of school parameters to protocols of extraction of school parameters from the acoustic data.

Specific surveys at sea.

The objective is to record
(i) for partner IEO: the influence of the day/night cycle on the aggregations and
(ii) for partner IMBC: the influence of the species composition.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

Institut Francais de Recherche Scientifique pour le Developpement
Address
911, Avenue Agropolis
34032 Montpellier
France

Participants (4)

Fisheries Research Services
United Kingdom
Address
Victoria Road
AB11 9DB Aberdeen
IFREMER - DRV/RH
France
Address
Rue De L'ile D'yeu
44311 Nantes
Institute of Marine Biology of Crete
Greece
Address
Main Port Heraklion
71003 Heraklion
Instituto Español de Oceanografòa
Spain
Address
S/n,muelle De Animas, S/n, Apartado De Correos 130
15080 La Coruna