11.4.3 ICES (International Council for the Exploration of the Sea) Survey Data
11.4.3.1 International Bottom Trawl Survey (IBTS) 12.
IBTS data has been accessed via the ICES Data Portal (DATRAS, the Database of Trawl Surveys:
http://datras.ices.dk). The DATRAS on-line database contains trawl information and biological data on all surveys conducted by the ICES IBTS sampling programme. Since 1997 surveys have employed a standardised method with a GOV1 trawl used to sample a series of fixed stations, twice per year in the 1st and 3rd quarters of the year (IBTS, 2004). The species abundance data presented refers to the average number of fish caught per hour (in those ICES rectangles corresponding to the defined study area) by IBTS North Sea surveys conducted between 2004 and 2013.
11.4.3.2 International Herring Larval Survey (IHLS) 13.
IHLS data has been accessed via the ICES Data Portal (
http://eggsandlarvae.ices.dk). The IHLS surveys routinely collect information on the size, abundance and distribution of herring eggs and larvae (and other species) in the North Sea. The values for larval abundance presented refer to the number of herring larvae in the smallest reported size category (<11mm total length) caught per square metre at each site sampled per fortnight in the 3rd quarter in each year between 2004 and 2013 (ICES, 2013).
11.4.3.3 The Channel Habitat Atlas for Marine Resource Management (CHARM) 14.
CHARM is a collaborative Franco-British project (Interreg IIIA) initiated to support decision-making for the management of essential fish habitats (
http://www.charm-
project.org/en/). The Atlas relates fish geographic distribution and environmental factors in order to delineate the optimum habitat for a number of species. The Atlas is based on data obtained from IFREMER’s Channel Ground Fish Surveys (CGFS), including species abundance and environmental data, and fish eggs data collected using Continuous Underway Fish Egg Sampler (CUFES) during the French part of the IBTS (2006-2010). Habitat suitability models (HIS) are used to produce GIS outputs of optimum habitats, spawning grounds, nursery areas and presence probability. Unless otherwise specified, estimates of species abundance equates to the number of eggs per 20 m3 following log-transformation (log10(x+1).
11.4.4 Site Specific Surveys 15.
Fish and shellfish characterisation surveys using otter and beam trawls were undertaken within the proposed East Anglia THREE project area to provide
1 GOV - “Grande Ouverture Verticale”: Standard otter trawl gear used in the IBTS
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
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