Long term benthic community dataset for fish and cephalopods on the continental shelves of the Bay of Biscay and the Celtic Sea
|Temporal extent||1987-10-01 -2020-12-06|
|Author(s)||Laffargue Pascal1, Delaunay Damien1, Badts Vincent1, Berthele Olivier1, Cornou Anne Sophie1, Garren Francois1|
|Contributor(s)||Maucorps Alain, Chevalier Robert, Quéro Jean-Claude, Laurec Alain, Poulard Jean-Charles, Charuau Anatole, Bellail Robert, Mahe Jean-Claude, Leaute Jean-Pierre, Salaun Michele, Dimeet Joel, Pawlowski Lionel, Duhamel Erwan, Caroff Nicolas, Rivoalen Jean-Jacques, Bouche Ludovic, Martin Stephane, Le Ru Loic, Le Roy Didier, Iglesias Samuel|
|Affiliation(s)||1 : IFREMER, France|
|Keyword(s)||Fisheries survey, Demersal communities, Bottom trawl, Fishes, Cephalopods, Biodiversity, Bay of Biscay, Celtic Sea, GOV, Northern Atlantic, Soft bottom|
EVHOE surveys have been providing observational data on bentho-demersal communities on the continental shelves of the Bay of Biscay and the Celtic Sea for more than 30 years. The surveys operate a standardized fishing gear and are conducted on the continental shelves from 15 to 600 m depth, usually in the fourth quarter of the year, starting at the end of October. The main objectives are the monitoring of 22 stocks of benthic fish species and 10 cephalopods from the North-East Atlantic. The data also provide a description of regional diversity by including 250 taxa of fish and 45 taxa of cephalopods and others “commercial” invertebrates. The dataset is structured in 3 tables providing information on stations, numbers, biomass of observed species and size distributions for a selection of species. This dataset is of great interest for the long-term monitoring of the continental shelves of the Bay of Biscay and the Celtic Sea. Moreover, on a larger scale, by being integrated into a European network of bottom trawl surveys, these data play an essential role in studying the evolution of ecosystems from continental shelves to the scale of the eastern North Atlantic.
|Acknowledgements||All the participants in the Evhoe fishing surveys and in particular the pioneers of the fisheries survey in the bay of Biscay, A.Maucorps, R.Chevalier,J.-C.Quéro, A.Laurec, and the successive heads of mission and observation managers who have been on board since 1987 : Jean-Charles Poulard, A.Charuau, R. Bellail, J.-C. Mahé, J.-P. Léauté, M. Salaün, J. Dimeet, L. Pawlowski, E. Duhamel, N. Caroff, J.-J. Rivolaen, L. Bouche, S. Martin, L. Le Ru, D. Le Roy and more generally the staff of the IFREMER’s research units STH, EMH, HMMN and Marbec.All the sailors of GENAVIR, operator of the Thalassa, as well as the "French Oceanographic Fleet" for the technical and organizational support of these fishing surveys. All the students who sometimes started their career by joining EVHOE and all the colleagues from others institutes and various countries who contributed to the collection of data. Special thanks go to fish identification specialists from IFREMER, from the National Museum of Natural History and from various institutes, J.-C.Quéro, S.Iglésias, J.Spitz,who, through their expertise and regular boardings, have made it possible to ensure the reliability of the identifications on board. The IFREMER "Fisheries Information System" teams (https://sih.ifremer.fr/) for improving the sample processing, banking and data control tools, as well as the administrative managers of these surveys and their financing. The members of the ICES WGIBTS group who participated in the harmonization of observation at the European level. The neighbouring countries are thanked (Spain, United-Kingdom, Ireland) for giving access to their territorial waters. These surveys were financially supported by Europe through the data collection framework (Regulation (EU) 2017/1004 of 17 May 2017), the responsibility of the organization was transmitted to IFREMER through the French Ministry of Fisheries and Aquaculture (DPMA).|
The dataset is configured in a simplified format including 3 tables in a “.csv” file format (Table below): the "Haul" table including metadata for the sampled stations, the "Catch" table giving total number and biomass of each taxa, the “Size” table that gives length information for the species measured. Except for the proposed simplified format, the data provided are close to the raw data stored in the IFREMER "Harmony" database and have not been subject to any post-processing (except for the necessary calculation in the case of sub-sampling to report the catch at the trawl haul scale). The taxonomic information has been updated using online “World Register of Marine Species” (WoRMS Editorial Board, 2020). The extraction of the taxonomic information (updated valid names, taxonomy and Aphia ID) was performed using dedicated R packages (« worms 0.2.2” and “worrms 0.4.0”).
Description of data tables and associated fields :