Potential Impacts of the Specified Activities on Subsistence UsesThe specified activities will occur near marine subsistence harvest areas used by Alaska Natives from Unalaska and the surrounding areas. We interpret this definition to include human activity that may result in PTS in a sea otter's hearing sensitivity or injury to sea otters. Monitoring plans document when and how sea otters are observed, the number of sea otters, and their behaviors during the observation. (13) Vessels must not be operated in such a way as to separate members of a group of sea otters (two or more sea otters) from other members of the group, encircle sea otters, or impede movement of sea otters. (iii) Observation records of sea otters will include date, time, the PSOs' locations, sea otter's heading (if moving), weather condition, visibility, number of sea otters, group composition (adults/juveniles), and the location of the sea otters (or distance and direction from the PSO).