Release and recapture data from cod tagged in the North Sea from 1961 to 2015

Release and recapture data relating to cod tagged and released in the North Sea (ICES Subarea 4). Between 1961 and 2015, a total of 22,573 cod were tagged and released using either conventional marker-ID tags and in the more recent years of the dataset, electronic data storage tags (DSTs), of which 6,703 tags were subsequently returned. For tagged fish that were recaptured as much information as possible was recorded, namely the recapture date and location, length, weight, sex and maturity. Otoliths (ear stones) were removed for age determination purposes and other studies. These data are used to provide information for studies relating to fish behaviour, growth and identification of stock units.