CEFAS02fafc97-688e-4315-83bb-7503317a550f 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 2019-10-29T10:09:34 EPSG Geodetic Parameter Registry 2022-01-07 revision WGS 84 Bristol Channel 100mm codend trials 2010/11 - Fisheries Science Partnership FSP Bristol Channel 100mm codend trials 2015-10-22 publication 2019-10-29 revision 2012-10-24 creation CEFAS643 https://data.cefas.co.uk This work was carried out as part of the Fisheries Science Partnership (FSP), a Defra-funded collaborative programme of scientific research between the UK fishing industry and scientists. Local trawlermen working in the Bristol Channel in a mixed demersal fishery wanted to know whether an increase in codend mesh size would be effective in reducing the levels of discards, and whether its use would result in the loss of marketable fish. 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 unknown Biota abundance, biomass and diversity Fish 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 -5.00 -2.00 51.00 52.00 2010-07-01 2010-10-31 Binary Unknown https://data.cefas.co.uk/view/643 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 The gear used for the trials was a pair of twin-rig box trawls with 18 m footropes, rigged on 10 and 12 inch rockhoppers. The trawls were coupled to 15 fathom split bridles which in turn were attached to a short length of sweep (~5 fathoms). A set of A1, 6 foot otterboards were used to spread the trawls. New codends were used in the trial for both the 80 mm control codends and the 100 mm test codends. Both the test and control codends were constructed of 4 mm diameter polyethylene twine and were of a standard length of 100 meshes. To keep the cut-offs at the same length, the cut off rope was placed 30 meshes from the last round on the test codend and 36 meshes from the last round on the control codend. The mesh sizes of the codends were checked with the Omega net-measuring gauge. To account for seasonal variability in the catch, the fishing trials took place over a period of four months, between July and October 2010. Four trips of 1.5–3 days each were conducted. The trials followed the vessel’s normal fishing pattern and were carried out in both daylight and darkness. Haul duration was kept at 4 h where possible, to simulate normal fishing patterns. Hauls were conducted off the North Devon coast, including Bideford Bay, West of Lundy, and in the North and South Bristol Channel. The 80 mm and 100 mm codends were fished simultaneously side-by-side on the twin-rig trawls. Cefas scientific staff measured the lengths of all the fish caught in each haul, with the catch from each codend measured separately. The crew sorted the catch as they would normally do, and the retained fraction and discard fraction were sampled separately. When catch volumes were high, a known fraction was measured (i.e. the catch was sub sampled) and raised to provide an estimate for the haul. MEDIN 3.1.1