Swordfish and blue shark
Field study in the wild
Effect on target catch:
There was no significant difference in the number of blue sharks caught on non-offset 16/0 and 18/0 circle hooks .
Effect on bycatch species:
Non-offset 16/0 and 18/0 circle hooks caught fewer turtles than Japanese tuna hook. Non-offset 18/0 circle hooks caught fewer turtles than non-offset 16/0