April 27, 2021 — The Western Pacific Regional Fishery Management Council (Wespac) took a major step forward at its March meeting by recommending the prohibition of wire leaders on the Hawaii deep-set longline tuna fishery in the western Pacific Ocean. Wire leaders, also known as steel trace, are used by vessels fishing for bigeye tuna, but when sharks are accidentally caught on the line, they are unable to free themselves and frequently die as bycatch. This is a problem for the oceanic whitetip shark, which is classified as critically endangered by the International Union for Conservation of Nature. A switch to nylon, or monofilament, leaders, which are easier for sharks to bite through, would reduce mortality and help give this shark population a chance to recover.
In addition, the council recommended the development of a requirement to remove as much fishing line, or trailing gear, from an accidentally caught shark as possible—that is, to cut the line as close to the shark as possible before release. That would further protect sharks once freed from a longline. Council staff estimated that these two requirements would reduce mortality by 17% to 36%.
It’s now critical that the council finalize these much-needed decisions at its June meeting and that federal fishery managers implement them. The recommendations have wide support—including from the Hawaii Longline Association, which announced that its member fishing vessels would voluntarily ban wire leaders months before the council recommendation.