Performance of circle hooks in swordfish targeting longline fisheries in the Mediterranean

Based on a series of experimental fishing trials in the eastern Mediterranean, the current study attempts to evaluate the impact of modifications in swordfish targeting surface long-lines (i.e employment of circle hooks instead of the traditional J-type ones) on the catch rates of the target species and on unwanted by-catch. Results did not show statistically significant differences among hook types, with regards to the catch rates of target and by-catch species but it was found that the circle hooks capture proportionally less undersized swordfish individuals. However, further studies in different Mediterranean regions are needed to verify if the wide employment of circle hooks would result in the reduction of juvenile swordfish catches in the region.