f9e6c4ad-5351-4288-8cee-d765dd75f9ba Sextant Ifremer ZI Pointe du Diable Plouzane Brittany 29280 France sextant@ifremer.fr https://sextant.ifremer.fr/eng pointOfContact 2025-05-16T09:39:23.132323Z ISO 19115-3 - SEXTANT 1.0 EPSG:4326 Triennial Mackerel Egg Surveys at the Shelf Edge - RV Cirolana 2021-07-12 revision f9e6c4ad-5351-4288-8cee-d765dd75f9ba The abundance of ichthyoplankton in samples from dedicated plankton surveys by Cefas with positional and sample data. Surveys took place off the Western Coast of the UK and Ireland between 1986 and 2004. Series of cruises undertaken to contribute to the estimation of the spawning stock biomass of the western mackerel and horse mackerel stocks by plankton survey. The triennial mackerel egg surveys were begun in 1977 to estimate the SSB of the western mackerel stock. Since 1986 the surveys have also been used to estimate the SSB of horse mackerel. Plankton sampling is undertaken to estimate the egg production and trawling is carried out to estimate the mean fecundity of the mature female fish. Various designs of Gulf VII type samplers have been used with various apertures of nosecones and 270 micron nets. Samplers are now standardised to the 53cm version, fitted with 20cm aperture nosecones. Analysis at Cefas involved separating all fish eggs and larvae from samples. Where possible all eggs were identified. Eggs lacking identifiable features were measured. Where >100 eggs were found, sub-sampling was undertaken. Eggs that were unmeasured were apportioned across the size distribution of measured eggs. All mackerel and horse mackerel eggs were staged. Centre for Environment, Fisheries and Aquaculture Science (UK) Sophie Pitois Cefas sophie.pitois@cefas.co.uk pointOfContact https://sextant.ifremer.fr/geonetwork/srv/api/records/f9e6c4ad-5351-4288-8cee-d765dd75f9ba/attachments/139_Mackerel%20larvae%20data%20from%20CPR%20study.jpg /Biological Environment/Species/Fish Species of Commercial Interest Thèmes Sextant 2023-03-16 publication geonetwork.thesaurus.local.theme.sextant-theme Species distribution GEMET - INSPIRE themes, version 1.0 2018-07-27T14:39:48 publication geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme Data Mission Atlantic - Resources 2023-03-16 publication geonetwork.thesaurus.local.theme.mission-atlantic-resources Atlantic Ocean Celtic Seas Mission Atlantic - Case Studies 2023-03-16 publication geonetwork.thesaurus.local.theme.mission-atlantic-case-studies /Biological oceanography/Fish Mission Atlantic - BODC Parameters 2023-03-16 publication geonetwork.thesaurus.local.theme.mission-atlantic-bodc-parameters Biological data Mission Atlantic - Data type (DMP) 2023-03-16 publication geonetwork.thesaurus.local.theme.mission-atlantic-data-type WP6 Dynamics of ecosystem state and resources Mission Atlantic - Work Package 2023-03-16 publication geonetwork.thesaurus.local.theme.mission-atlantic-work-package CC0 (Creative Commons - Transfer into public domain) 96d5febc-df92-4c52-b087-c13ff86fa668 grid utf8 oceans -14.3582 -0.3554 42.9824 59.8995 ESRI Shapefile 1.0 https://data.cefas.co.uk/view/3791 WWW:LINK Triennial Mackerel Egg Surveys at the Shelf Edge - RV Cirolana 05/1986 https://data.cefas.co.uk/view/3792 WWW:LINK Triennial Mackerel Egg Surveys at the Shelf Edge - RV Cirolana 05/1989 https://data.cefas.co.uk/view/3793 WWW:LINK Triennial Mackerel Egg Surveys at the Shelf Edge - RV Cirolana 06/1992 https://data.cefas.co.uk/view/3794 WWW:LINK Triennial Mackerel Egg Surveys at the Shelf Edge - RV Cirolana 4a/1995 https://data.cefas.co.uk/view/3795 WWW:LINK Triennial Mackerel Egg Surveys at the Shelf Edge - RV Corystes 06/1998 https://data.cefas.co.uk/view/3796 WWW:LINK Triennial Mackerel Egg Surveys at the Shelf Edge - RV Cirolana 04/2001 https://data.cefas.co.uk/view/3797 WWW:LINK Triennial Mackerel Egg Surveys at the Shelf Edge - RV Corystes 01/2001 https://data.cefas.co.uk/view/2567 WWW:LINK Triennial Mackerel Egg Surveys at the Shelf Edge - RV Endeavour 05/2004 RÈGLEMENT (UE) N o 1089/2010 DE LA COMMISSION du 23 novembre 2010 portant modalités d'application de la directive 2007/2/CE du Parlement européen et du Conseil en ce qui concerne l'interopérabilité des séries et des services de données géographiques 2010-12-08 publication See the referenced specification