CEFASa66db34e-d3f3-4ce2-8b78-c7d0084bd519 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 2023-12-08T11:29:52 EPSG Geodetic Parameter Registry 2022-01-07 revision WGS 84 Sea pen density data in towed video from Farne Deeps 2016 2023-11-01 publication 2023-12-08 revision 2022-10-13 creation CEFAS21519 https://data.cefas.co.uk The dataset contains count and density (ind./m2) of the sea pens *Pennatula phosphorea* and *Virgularia mirabilis* in 121 video transects collected using a towed camera sledge at Farne Deeps (ICES Functional Unit 6) in June 2016. The data is saved as a csv file containing the video recording identifier, station identifier, video tow start and end coordinates and count and density of each sea pen species. The sea pen counts were extracted for the purpose of mapping sea pen density across the Farne Deeps mud basin. The video footage was originally collected as part of a programme of stock assessments for the Norway lobster (*Nephrops norvegicus*) coordinated by the the ICES Working Group on *Nephrops* Surveys (WGNEPS). The video surveys are carried out annually for specified *Nephrops* fishing grounds (‘Functional Units’, FU) for use by the European Commission to set annual Total Allowable Catches (TAC’s) at the ICES sub-area level. 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 Department for Environment, Food and Rural Affairs (DEFRA) defra.helpline@defra.gov.uk owner notPlanned Benthos Invertebrate GEMET, version 1.0 2008-06-01 publication Biota abundance, biomass and diversity SeaDataNet P03 parameter discovery vocabulary 2011-03-25 revision Fauna abundance per unit area of the bed Seabed photography SeaDataNet P02 parameter discovery vocabulary 2011-03-25 revision Species distribution GEMET - INSPIRE themes, version 1.0 2008-06-01 publication Circalittoral 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 2022'** .. _`https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/)`: https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ English biota 1.73881 1.74086 52.4581 52.4595 2016-06-22 2016-06-27 Unknown https://data.cefas.co.uk/view/21519 Cefas Data Portal information The Cefas Data Portal contains metadata records and data sets available to download and connect to in support of our commitment to open science. 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 data has been collected using a randomised fixed grid of 110 annually visited survey stations positioned over the Farne Deeps *Nephrops* ground, with 11 additional coastal stations visited in 2016. The standard survey methodology used involves the use of a towed sledge mounted camera, to conduct 10-minute video tows at a speed of 0.7 knots. Vessel position during the tow is recorded every 10 seconds using a differential global positioning system (DGPS) and sledge position using an ultra-short baseline (USBL) transponder. Two fan lasers with a known distance are used to delimit the field of view. The video footage is collected using a Subsea Technology and Rentals (STR) SeaSpyder high-definition (HD) Internet Protocol (IP) 720p camera and stored in MP4 format. Videos were annotated using the BIIGLE (`https://biigle.de/`_) annotation software. Sea pens were recorded in the form of point annotations (by species), of each sea pen within the field of view delimited by the fan lasers. Counts were converted into an estimated density (individuals/m2) using the observed area derived from the width of the laser gates (0.81 m) and the length of each individual camera sledge tow (mean 219 m, SD 18 m). .. _`https://biigle.de/`: https://biigle.de/ MEDIN 3.1.1