European Directory of Marine Environmental Data (EDMED)

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General
Data set name

IMARES, North Sea Beam Trawl Survey (BTS) (1985-)

Data holding centreIMARES, Wageningen UR, Institute for Marine Resources and Ecosystem Studies, IJmuiden
CountryNetherlands  Netherlands
ProjectNorth Sea Beam Trawl Survey(BTS)
Time periodYearly sampling in august/september since 1985.
OngoingYes
Geographical area

1985-1998: only sampling in Southeastern North Sea (4-8 E, 51.5-56 N). Since 1998 full coverage

Observations 
Parameters

Fish morphology, age and physiology; Fish taxonomy-related abundance per unit area of the bed; Fish taxonomy-related counts; Fish biomass in water bodies; Salinity of the water column; Raw temperature and/or salinity instrument output; Temperature of the water column

Instruments

Beam trawls; balances and scales; rulers; CTD

Description 
Summary

The primary aim of the Beam Trawl Survey (BTS) is to get fisheries independent stock indices and estimates of the age-structure of North Sea plaice (Pleuronectes platessa) and sole (Solea solea). The BTS indices are used by the ICES Working Group on the Assessment of Demersal Stocks in the North Sea and Skagerrak (WGNSSK) for stock assessments and recruitment estimation. Both are important data sources for the catch predictions and hence for management advice. In addition to flatfish, the applied beam trawl also catches benthic ( = bottom dwelling) organisms (e.g. echinoderms, squid, crabs), which are counted. The BTS thus also contributes valuable information concerning the state of the North Sea ecosystem.

OriginatorsIMARES, Wageningen UR, Institute for Marine Resources and Ecosystem Studies, IJmuiden
Data web sitehttp://datras.ices.dk
Availability 
OrganisationIMARES, Wageningen UR, Institute for Marine Resources and Ecosystem Studies, IJmuiden
AvailabilityDistribution cost charge; unrestricted
ContactIngeborg de Boois
Address

IMARES, Wageningen UR, Institute for Marine Resources and Ecosystem Studies, IJmuiden
Haringkade 1
IJmuiden

1976 CP
Netherlands

Telephone+31 317480900
Facsimile+31 317487326
Emailingeborg.deboois@wur.nl
Administration 
Collating centreNational Oceanographic Data Committee
Local identifierIMARES_5760006
Global identifier4801
Last revised2011-02-24