Details of Dredge Fishing Effort


Dataset identification

Title of datasetDredge Fishing Effort
Narrative summary of datasetThis dataset shows the distribution of fishing effort by fishing vessels according to the gear type used - dredge fishing. Fishing effort is defined as the time spent engaged in fishing operations or time spent at sea, this time may be multiplied by a measure of fishing capacity, e.g. engine power. In this dataset fishing effort is measured as average hours spent actively fishing per kilometre square, per year. Data from years 2014 to 2018 was used to produce this data product for the Marine Institute publication the “Atlas of Commercial Fisheries around Ireland, third edition“ (
Summary of processing methodologyThe VMS data was analysed using the approach described by Gerritsen and Lordan (IJMS 68(1)). This approach assigns effort to each of the VMS data points. The effort of a VMS data point is defined as the time interval since the previous data point. Next the data are filtered for fishing activity using speed criteria, vessels were assumed to be actively fishing if their speed fell within a certain range (depending on the fishing gear used). The points that remain are then aggregated into a spatial grid to produce a raster dataset showing fishing effort (in hours) per kilometre square per year for each gear type group. The data is available for all countries combined and for Irish vessels only.
Supporting documentation
Start date2014-01-01
End date2018-12-31

Responsible organisations

Organisation nameMarine Institute
Role of organisationOriginator of Dataset
Organisation nameMarine Institute
Role of organisationPublisher

Dataset availability

Original dataset download link
Dataset formatraster
Public accessNo limitations
License for useCC-BY 4.0


Latitude north boundary55.570751882979
Longitude east boundary-4.3276554757269
Latitude south boundary49.545011814916
Longitude west boundary-16.104999225727
Sea areaNorth Atlantic Ocean

Data types, collection and processing

Observation typeFisheries
ParameterFishing effort

Process information

Submitting organisationMarine Institute
Submission identifier (UUID)58ed3f8c-6008-44b5-a09a-c0a8a47e6f5c
Date of dataset creation2014-01-01
Date of metadata creation2022-05-23
Date of metadata latest revision2022-08-29
Date of publishing2022-08-31
Processing data centreCOGEA SRL, Business Management Consultants
Summary record-ID1112