CEFASac7ba728-2ade-49f1-860a-9cf997c41bd5 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 2023-11-21T12:40:11 EPSG Geodetic Parameter Registry 2022-01-07 revision WGS 84 Selectivity of hake gill nets in the Southwest fishery 2005/06 - Fisheries Science Partnership FSP Selectivity of hake gill nets in the Southwest fishery 2014-12-05 publication 2023-11-21 revision 2012-10-24 creation CEFAS625 https://data.cefas.co.uk To examine the catch composition and selectivity of a range of static gears for hake in the southwest fisheries. FSP Programme 8 demonstrated the selectivity characteristics of 120mm mesh gill nets used by UK hake fishermen off the south west coast of England. The experiment was carried out by comparing the catches in nets of mesh size 80, 100, 120 and 140mm deployed simultaneously at two fishing grounds. Additional 120mm nets were shot to obtain further data on size composition of hake. The work was carried out in October and November 2005, using the vessel *Carol H.* 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 **Publicly available data licensed under the Open Government Licence v3.0 (`https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/)`_ – Please note the applicable attribution statement is as follows: ‘includes Crown copyright, Cefas [2005]'** .. _`https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/)`: https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ English biota -8.00 -3.00 49.50 52.00 2005-10-08 2005-11-14 Binary Unknown https://data.cefas.co.uk/view/625 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 project objectives were addressed primarily through analysis of length frequency data. The length frequencies reflect a combination of the selectivity characteristics of the gear and the abundance of fish of different sizes present at the times and locations where the gear is fished. The selectivity of the gear can be represented by a curve showing the probability of fish of different sizes being caught when they try to escape the gear. In the case of a gill net where the majority of fish become gilled or wedged in the meshes, the curve is often bell shaped, with the peak corresponding to the sizes of fish most likely to be enmeshed. If additional fish are caught by entanglement (e.g. by teeth in the case of hake), the selection curve may cover a broader range of lengths or even have more than one length mode. When estimating the shape of the hake gill net selectivity curves, the variations in abundance of fish of different sizes around the net have to be considered. For enmeshing gears such as gill nets, the normal approach is to hang fleets of nets of different mesh but otherwise identical construction, and to compare the length frequencies in each. This approach was adopted for this FSP project. MEDIN 3.1.1