Download FAR 2017/07 Development of Southern Hemisphere porbeagle shark stock abundance indicators using Japanese commercial and survey data

Southern hemisphere porbeagle shark catch, effort, and biological data from Japanese fisheries were analysed to provide information for stock assessment, as part of a New Zealand – Japan collaboration. Methods were developed to explore logbook shark reporting reliability, which was found to increase sharply in 2008. Size was found to be strongly associated with sea surface temperature. Catch rate analyses provided indices for three areas from the eastern Atlantic to the western South Pacific.