European Directory of Marine Environmental Data (EDMED)

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General
Data set name

IMARES, International Bottom Trawl Survey (IBTS) (1965-)

Data holding centreIMARES, Wageningen UR, Institute for Marine Resources and Ecosystem Studies, IJmuiden
CountryNetherlands  Netherlands
ProjectInternational Bottom Trawl Surveys (IBTS)(IBTS)
Time periodYearly sampling in February (1965-current), April, August, October (1965-1990)
OngoingYes
Geographical area

North Sea, sampling depending on international coverage

Observations 
Parameters

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

Instruments

Plankton nets; demersal trawl nets; balances and scales; rulers; CTD

Description 
Summary

The North Sea International Bottom Trawl Survey is coordinated by the ICES International Bottom Trawl Survey Working Group (IBTSWG). Having evolved from a herring survey, when only data on young herring were collected, the IBTS now targets the following commercial finfish species: herring (Clupea harengus), cod (Gadus morhua), whiting (Merlangius merlangus), haddock (Melanogrammus aeglefinus), saithe (Pollachius virens), Norway pout (Trisopterus esmarki), mackerel (Scomber scombrus), and sprat (Sprattus sprattus). The main objective of the IBTS is to provide recruitment indices of these commercial fish species. Furthermore, to get an early indication of the potential amount of young herring, the abundance and distribution of herring larvae is monitored by fishing with a plankton net at night. Parallel to trawling, hydrographic data (salinity, temperature) are collected.

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_5760009
Global identifier4798
Last revised2011-02-24