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Harbor Seal Survey in Alaska

Two NOAA Twin Otter aircraft were used to conduct the aerial surveys with the support of NOAA’s Aircraft Operations Center.

Map of Alaska showing the survey effort of seals on shore with red dots and survey effort of seals on glacial Ice with black triangles.

Alaska Fisheries Science Center's Marine Mammal Laboratory, Polar Ecosystems Program, conducted extensive aerial surveys for harbor seals throughout much of the species’ range in Alaska during August and September in 2015. Shore-based counts of harbor seals were obtained on Otter Island in the Pribilof Islands and aerial survey effort extended from Ketchikan in the southeast, to Umnak Island in the Aleutian Islands, and to Lake Iliamna and Nanvak Bay in the Bristol Bay region. 

Two NOAA Twin Otter aircraft were used to conduct the surveys with the support of NOAA’s Aircraft Operations Center. In addition to the surveys of seals hauled out along shores, seals that hauled out on ice within glacial fjords were photographed using a multi-camera array. With few exceptions, remarkably favorable weather allowed biologists to survey nearly daily—logging more than 170 flight hours and completing the first comprehensive survey of all Alaskan tidewater glacial fjords where seals occur. Researchers also took the opportunity to test new, higher-resolution cameras and an infrared camera system that will be used in future surveys of harbor seals, as well as ice-associated seals in the Chukchi Sea.

Additional Resources




Reaction of Harbor Seals to Cruise Ships

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Disturbance of Harbor Seals by Cruise Ships in Disenchantment Bay, Alaska: An Investigation at Three Spatial and Temporal Scales

Final Report with results on: 1) Behavioral response of seals to approaching vessels (fine scale); 2) Variation in local seal abundance and…


Natural and Human Effects on Harbor Seal Abundance and Spatial Distribution in an Alaskan Glacial Fjord

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