The U.S. National Marine Fisheries Service has issued an Incidental Harassment Authorization to Hilcorp Alaska, LLC to take, by harassment, small numbers of marine mammals incidental to a shallow geohazard survey in the Beaufort Sea, Alaska, during the 2015 Arctic open-water season. This IHA is effective July 1, 2015, through September 30, 2015.
NMFS’ Federal Register notice of this final IHA responds to comments filed by the U.S. Marine Mammal Commission on the proposed IHA. There follows NMFS’ rejection of the MMC’s argument that “the sub-bottom profiler, echosounder, and other sonars are nonimpulsive acoustic sources and that NMFS should use the behavioral harassment threshold of 120 dB re 1 mPa instead of 160 dB”: