CEFAS99d0084b-98a5-411e-a8d4-edafb4d64e67 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 2025-09-23T01:47:17 EPSG Geodetic Parameter Registry 2022-01-07 revision WGS 84 International Bottom Trawl Survey Jellyfish Data - North Sea - 2012 to 2023 2019-09-20 publication 2025-09-23 revision 2019-07-11 creation CEFAS19932 https://data.cefas.co.uk The wet weight in grams of gelatinous zooplankton (jellyfish) caught at each station during International Bottom Trawl Surveys in the North Sea from 2012 to 2023. Also included are associated station data which include datetime, location, depths, swept volume and information on gear deployment. Any blank values indicate the value was not recorded. 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 notPlanned Ecology Ecosystem Monitoring Plankton GEMET, version 1.0 2008-06-01 publication Fisheries Zooplankton SeaDataNet P03 parameter discovery vocabulary 2011-03-25 revision Zooplankton wet weight biomass SeaDataNet P02 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 Public data - no limitations to reuse English biota -2.00 9.00 51.00 58.00 2012-08-07 2023-08-31 Binary Delimited Geographic Information System Unknown https://data.cefas.co.uk/view/19932 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, CSV, ESRI Shapefile. The data can also be accessed via the WFS and WMS protocols. 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 Jellyfish data was collected using standard GOV fishing gear deployed from Cefas RV Endeavour, to carry out the International Bottom Trawl Survey (IBTS) since 2012. Cefas is responsible for the Quarter 3 (Q3) survey which is recurring every August and covers the North Sea. The IBTS is a fishery dependent multi-species bottom trawl survey coordinated within ICES areas. These surveys aim to provide ICES assessment and science groups with consistent and standardized data for examining spatial and temporal changes in (a) the distribution and relative abundance of fish and fish assemblages; and (b) of the biological parameters of commercial fish species for stock assessment purposes. Full details of protocols are described in the official manual: `https://www.ices.dk/Science/publications/Documents/SISP/ICES%20Survey%20Protocol%20Guidelines.pdf`_ Following each fishing trawl described in the protocol, gelatinous zooplankton (commonly known as jellyfish) collected in the net were processed similarly to the fish. The rationale for the sampling of jellyfish is explained in Aubert et al. 2018 ( `https://doi.org/10.1016/j.marpol.2017.12.010`_), which also contains the official standard operating protocol to process the gelatinous zooplankton. Gelatinous zooplankton were separated according to species. The bulk of each species was weighted with individuals also weighted and measured. Unrecognisable specimen were categorised into a "non-identified" category. .. _`https://www.ices.dk/science/publications/documents/sisp/ices%20survey%20protocol%20guidelines.pdf`: https://www.ices.dk/Science/publications/Documents/SISP/ICES%20Survey%20Protocol%20Guidelines.pdf .. _`https://doi.org/10.1016/j.marpol.2017.12.010`: https://doi.org/10.1016/j.marpol.2017.12.010 MEDIN 3.1.1