Biological Sampling Survey Stations Catch Numbers

Published by: Marine Institute
Category: Environment
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Catch numbers data collected from a bottom trawl survey series: Trawl positions, duration and gear parameters; catch statistics of the target species; length frequency distributions; age, sex and maturity. The target species are: cod, haddock, whiting, saithe, hake, black and white-bellied anglerfish, megrim, plaice, sole, herring, blue whiting, mackerel, horse mackerel, blonde ray, cuckoo ray, spotted ray and thornback ray. Data coverage has been for the waters around Ireland from 10m to 180m in depth (Irish Sea, Celtic Sea, West and North of Ireland). The spatial coverage has varied from year-to year. The sampling locations have been selected from known fishing tracks while trying to ensure maximum spatial spread over the survey area. The surveys took place in February-March of 2004-2009. Samples were collected using a GOV bottom trawl (a scaled-down version of the IBTS standard, see: Manual for the International Bottom Trawl Surveys, ICES Survey Protocols SISP 1-IBTS VIII). The main purpose of the survey was to collect information on the length and age at which target species first reach maturity in the waters around Ireland. The surveys were carried out by the Marine Institute (Ireland) Fisheries Science team. All data collected on the survey are available.

Data Resources (1)

available as CSV
Theme Environment
Date released 2010-08-03
Date updated 2017-12-13
Dataset conforms to these standards The INSPIRE Directive or INSPIRE lays down a general framework for a Spatial Data Infrastructure (SDI) for the purposes of European Community environmental policies and policies or activities which may have an impact on the environment.
Rights notes ['Creative Commons license conditions apply', '', 'license']
Update frequency Never
Language English
Geographic coverage in GeoJSON format {"type":"Polygon","coordinates":[[[-12.1, 50.1],[-12.1, 56.1], [-4.1, 56.1], [-4.1, 50.1], [-12.1, 50.1]]]}
Spatial Reference Systems (SRS) WGS 84 (EPSG:4326)
Vertical Extent {"verticalDomainName": "sea level", "minVerticalExtent": "-1000", "maxVerticalExtent": "-20"}
Provenance information Data is collected at sea on survey and loaded to a SQL Server Database for management and quality control. Note: Data for the Current year is Provisional. Catch frequencies are measured in Numbers/Hour. Adult and Juvenile classification is a length based classification. The split for juveniles was below, and excluding, the lengths listed below: HADDOCK 20.0 cm, ATLANTIC COD 23.0 cm, HERRING 17.5 cm, WHITING 20.0 cm, EUROPEAN HAKE 20.0 cm, BLUE WHITING 19.0 cm, EUROPEAN PLAICE 12.0 cm, (EUROPEAN) MACKEREL 24.0 cm, HORSE-MACKEREL (SCAD) 15.0 cm Survey reports are available at
Period of time covered (begin) 2004-03-09
Period of time covered (end) 2009-03-01