Evaluating the effectiveness of seabird bycatch mitigation measures for pelagic longlines in the South Atlantic

This paper focuses on mitigation measures specified by the International Commission for the Conservation of Atlantic Tunas (ICCAT) related to threatened seabirds foraging in the south Atlantic Ocean. The authors developed an ecological risk assessment for various combinations of mitigation measures to protect five threatened albatross and petrel populations, comparing those specified by ICCAT to those recommend by the Seabird Bycatch Working Group of the Agreement on the Conservation of Albatrosses and Petrels (ACAP). They conclude that updating existing mitigation measure specifications for pelagic longlining in the South Atlantic to reflect current best practice guidelines would potentially reduce seabird mortality by 41–86 %, and predict that simultaneous application of all three ACAP recommended mitigation measures recommended (includingnight setting, branch line weighting, bird-scaring lines, and hook shielding devices) could reduce seabird mortality by 72–93 % and therefore should be considered by ICCAT.