CEFAS5a410d4a-3d06-450b-93c9-b05404f3029d 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 North Sea pout bycatch mitigation 2003/04 - Fisheries Science Partnership FSP North Sea pout bycatch mitigation 2015-10-22 publication 2019-10-29 revision 2013-10-03 creation CEFAS2908 https://data.cefas.co.uk Fisheries Science Partnership Programme 9, carried out in December 2003. The Programme was set up to investigate the extent to which a sieve net, incorporated into an industrial fishing trawl, could reduce the by-catch of whitefish whilst retaining sufficient catches of the target species Norway pout (*Trisopterus esmarkii*) in the northern North Sea. Sieve nets (also known as veil nets) are curved cone-shaped funnels of netting traditionally fitted to the inside of beam trawls used for brown shrimps, to reduce the by-catch of unwanted 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 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 -4.50 2.00 56.00 60.75 2003-12-01 2003-12-31 Binary Unknown https://data.cefas.co.uk/view/2908 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 fishing grounds chosen for this project were in the northern North Sea, in and around the ‘Pout box’, on the known commercial fishing grounds for Norway pout. The trials were conducted throughout a continuous two-week period in December 2004, traditionally a peak period for landings from this fishery. The commercial fishing vessel chartered for this project was the 45-metre stern ramp freezer trawler FV Swanella, H 1065. Two types of small meshed demersal trawls were used during the trials: a) Industrial trawl. A commercial design used for industrial fishing, supplied by a Danish trawl maker was initially used during the trials. This trawl was limited to use on soft fishing grounds due to its light construction and ground-gear. b) Modified whitefish trawl. A whitefish trawl was fitted with a 20mm cod end liner. This trawl was of a more substantial construction than the industrial trawl, with heavier ground gear, and could therefore be deployed over a wider terrain than the industrial trawl. The sieve net was constructed from 70mm (full mesh) diamond mesh polyethylene material (1.5mm diameter). Various minor adjustments were made to the sieve net throughout the course of the trials in an attempt to improve its performance. Both the industrial trawl and the whitefish trawl with the 20mm liner were repeatedly tested both with and without the sieve net in paired alternate hauls. In total, 37 hauls were made during the course of the trials, six of which were invalid due to fouled or damaged gear. The haul durations varied between 110 - 200 minutes (average 142 min) in depths ranging from 120 – 240 metres (average 154 m). The average towing speed was 3.9 knots (over the ground) and the choice of haul direction was made regardless of tidal flow. Fishing was conducted across, with and against the tide. Paired hauls were used to compare the catches in the trawl with and without a sieve net fitted. In each comparison the two tows with the different net configurations were made one after the other, over the same ground track and for the same duration as far as was practicable. . MEDIN 3.1.1