Preliminary attempt to evaluate the effect of a technical measure inducing a change of selectivity using combined data from a scientific survey and from the French observer at sea program. Joel Dimeet, Lionel Pawlowski, Marianne Robert, Alain Biseau, Be Joel Dimeet, Lionel Pawlowski, Marianne Robert, Alain Biseau, Be no no î î t Dubet t Dubet
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Preliminary attempt to evaluate the effect of
a technical measure inducing a change of
selectivity using combined data from a
scientific survey and from the French observer at sea program.
Commission implementing regulation (EU) No 737/2012 of 14 august 2012 on the protection of certain stocks in the
Celtic Sea
(6) In October 2011 the North Western Waters Regional Advisory Council (NWWRAC) issued advice that the current technical measures in the Celtic Sea should be improved to reduce discards, especially of haddock and whiting, by requiring the use of an appropriately positioned square-meshed panel of a specified size depending on the gear type and engine power of the vessel.
Bottom trawler or seines with…
(a)mesh size >=100mm or low powered vessels �
� Use of square-meshed panel of a mesh size of at least 100 mm.
(b)mesh size between 70-100mm
� Use of square-meshed panel of a mesh size of at least 110 mm.
www.ifremer.fr
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Commission implementing regulation (EU) No 737/2012 of 14 august 2012 on the protection of certain stocks in the
Celtic Sea
Case study:
- Whiting (Merlangius merlangus)
- Haddock (Melanogrammus aeglefinus)
- In ICES VIIg
- Length distributions available rom observer at sea and surveyprograms (second semester)
- 2010, 2011 (without) and 2012 (with new regulation)
www.ifremer.fr
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French Observer at Sea program
Data Collection Framework (DCF)
An EU framework for collection, management and use of datasets in the fishing industry and for supporting scientific advices within the CFP (fishmarket sampling, economics... )
ObsMer => Estimation of catch, discards and observation of environment and fishing strategies
www.ifremer.fr
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EVHOE survey
(EValuation des ressources Halieutiques de l’Ouest Europe
Evaluation of fishing ressources in the West of Europe)
Part of the International Bottom Trawl Surveys (IBTS)
�Evaluation of ressources :
Abundances indices on commercial species for use in stock assessments
�Acts as an observatory :
Long time series for the study of interannual variations of biological