CEFASf397b9fc-933a-418a-999a-72a93c2d3990 English dataset Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) Cefas Lowestoft Laboratory Pakefield Road Lowestoft Suffolk NR33 0HT UK data.manager@cefas.co.uk pointOfContact 2021-12-01T01:24:26 EPSG Geodetic Parameter Registry 2022-01-07 revision WGS 84 North Sea whiting 2006/07 - Fisheries Science Partnership FSP North Sea whiting 2014-12-05 publication 2021-12-01 revision 2012-10-24 creation CEFAS626 https://data.cefas.co.uk To investigate stomach contents of North Sea whiting to determine their diet, and any possible changes to that diet since the last large-scale stomach survey in 1991. The project will specifically address the potential problem of predation of whiting on cod, which, if frequent, may affect cod recovery. Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) Cefas Lowestoft Laboratory Pakefield Road Lowestoft Suffolk NR33 0HT UK data.manager@cefas.co.uk originator Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) Cefas Lowestoft Laboratory Pakefield Road Lowestoft Suffolk NR33 0HT UK data.manager@cefas.co.uk custodian Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) Cefas Lowestoft Laboratory Pakefield Road Lowestoft Suffolk NR33 0HT UK data.manager@cefas.co.uk distributor Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) data.manager@cefas.co.uk owner Department for Environment, Food and Rural Affairs (DEFRA) defra.helpline@defra.gov.uk owner notPlanned Biota abundance, biomass and diversity SeaDataNet P03 parameter discovery vocabulary 2011-03-25 revision Species distribution GEMET - INSPIRE themes, version 1.0 2008-06-01 publication Water column SeaVoX Vertical Co-ordinate Coverages 2010-05-18 revision Marine Environmental Data and Information Network MEDIN metadata record availability 2012-01-11 publication data.gov.uk MEDIN metadata record availability 2012-01-11 publication otherRestrictions noLimitations otherRestrictions Adherance to the Cefas Data access policy required. Terms and conditions of OGL – Open Government Licence apply. `http://www.nationalarchives.gov.uk/doc/open-government-licence/`_ .. _`http://www.nationalarchives.gov.uk/doc/open-government-licence/`: http://www.nationalarchives.gov.uk/doc/open-government-licence/ English biota -3.50 2.50 53.00 56.75 2006-08-01 2006-10-31 Binary Unknown https://data.cefas.co.uk/view/626 Cefas Data Portal download The Cefas Data Portal contains metadata records and data sets available to download and connect to in support of our commitment to open science. Data is available in the following formats: Binary download. dataset INSPIRE Data Specification on Species Distribution – Technical Guidelines 2013-12-10 publication false See the referenced specification Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 publication true See the referenced specification FV Nimrod BH-227 is a wooden trawler of overall length 16.5m. The vessel deployed an otter trawl similar to a Whitby jet trawl. This was used to fish over both soft and hard substrata as required in the survey. Two nets were used during the survey, one with an 80mm codend and the other fitted with a 40mm shrimp mesh liner. Both nets were fitted with 40’ (12.2m) of 14” (355mm) hoppers and were spread by a set of No.8 Bison trawl doors. The nets had a headline height of 14’ - 18’ (4.3 – 5.5m). The bridle length was 25 fathom (45.7m) splits and 10 fathom (18.3m) single. Fishing for the August survey was undertaken within British Fishery Limits in the North Sea between longitudes 2o W and 2° E, and bounded in the north by approx. 56.5° N and in the south by 53.5° N in ICES rectangles 36F0, 37E9, 37F0, 37F1,38E9, 38F0, 38F1, 39E8, 39E9, 39F0, 40E8, 40E9, 41E8 and 41E9. During the August survey, and in consultation with Cefas staff, an additional rectangle 38E8 was sampled once. This area was known to be a good fishing ground for whiting. For the October survey a change to the locations surveyed was made to include two hour-long hauls in ICES rectangle 38E8 and to exclude all hauls from 39F0. This change was based on whiting catches during the first survey, which were high in 38E8 and low in 39F0. Fishing was conducted in order to sample whiting representatively from the area of interest. 1. The sampling took the form of tows of 1h duration. Multiple short tows as opposed to fewer long tows are desirable for stomach content evaluation as the statistical power of the data analysis is improved. 2. Two 1h tows were undertaken within the ICES rectangle. 3. The start and end positions of the tow were decided by the skipper, as long as all other requirements detailed in section “Survey area” were met. Processing of catch and stomach sampling A length distribution was obtained by measuring a representative number of whiting from each haul. Normally this was the lengths of one basket of fish with a raising factor according to the number of baskets, but due to small catches in some hauls, all fish were measured. The catch of whiting was sorted into length categories 15 – 19cm, 20 – 24cm, 25 – 29cm, 30 – 34cm and 35+cm. Stomachs were opened and non-empty stomachs were placed into freezer bags and frozen for subsequent analysis in the laboratory. This continued until 10 fish from each size category were collected or until no fish remained in the appropriate size category. Any remaining whiting in the sub-samples were examined onboard and stomach contents were marked on a simple tick sheet. This allowed an initial idea of what was present in the stomachs of whiting as well as allowing a large number of samples to be processed. MEDIN 3.1.1