CEFASd91b43a8-f8cc-415a-92eb-effdd16456e4 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 2021-12-14T03:35:47 EPSG Geodetic Parameter Registry 2022-01-07 revision WGS 84 Developing the selective Net Grid trawl in the NE Nephrops trawl fishery 2015/16 - Fisheries Science Partnership FSP Developing the selective Net Grid trawl in the NE Nephrops trawl fishery 2017-08-23 publication 2021-12-14 revision 2017-08-23 creation CEFAS18684 https://data.cefas.co.uk This work was carried out as part of the Fisheries Science Partnership (FSP) programme. The trawler Luc SN 36 was chartered for 14 days between October and December 2015 to undertake trials in the *Nephrops* fishery off the North east coast of England. The specific objective was to modify the incline panel and the escape hole of the selective Net Grid trawl design to enable retention of marketable fish while still minimising catches of unwanted fish. The Net Grid is made of a 4-panel box section inserted into a standard two-panel trawl into which an inclined sheet of netting is laced. On top of the box section in front of netting grid is a fish escape hole. The netting grid acts as a physical barrier and guides fish out of the escape-hole while *Nephrops* pass through the netting to the cod end. 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 Monitoring Management Shellfish Advice Analysis Crustacean GEMET, version 1.0 2008-06-01 publication Fishing by-catch Shellfish abundance and biomass in water bodies SeaDataNet P02 parameter discovery vocabulary 2011-03-25 revision Species distribution GEMET - INSPIRE themes, version 1.0 2008-06-01 publication Benthic boundary 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 Public data - no limitations to reuse English biota -2.00 -0.50 54.50 55.25 2015-10-01 2015-12-31 Binary Unknown https://data.cefas.co.uk/view/18684 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 Prior to this project, Cefas in collaboration with several skippers from the NE English *Nephrops* fishery, had shown it was possible to catch *Nephrops* with very low cod catches using the Net Grid trawl (the initial motivation for the design), however, this also meant large reductions in the catches of other marketable fish. Therefore, while the Net Grid was efficient at minimising fish catches while retaining *Nephrops*, it was considered a rather blunt tool, whereby skippers could either catch fish (including unwanted fish) and *Nephrops* with a conventional trawl or only *Nephrops* with the Net Grid trawl. The idea came from the industry to further develop the Net Grid design so that it could retain marketable fish while still avoiding unwanted catches. The modifications to the Net Grid were to the escape hole at the top of the inclined netting grid in order to retain large marketable fish, and to the length of the inclined netting grid so that there was space at the bottom of the grid under which marketable fish could pass. Two modifications were tested, a simple cover of the escape hole with T90 120mm netting and the insertion of a larger section of T90 120mm in the top of the trawl above the netting grid including the area of the escape hole. Both designs included removing 8 meshes from the bottom edge of the inclined netting grid. To test the two designs, it was necessary to observe the fish that escaped through the T90 sections and compare with the fish that were retained in the cod end of the trawl. This was done by designing a cover over the T90 escape sections which terminated in a secondary top (cover) cod end. The catches retained in the two cod ends demonstrated which fish had entered the trawl and escaped through the T90 sections compared with those which were retained in the trawl and would have been caught if the trawl was applied commercially. MEDIN 3.1.1