2017 Northern Fur Seal Adult Male Counts on the Pribilof Islands, Alaska

Adult male northern fur seals on St. Paul Island were counted over the period July 9 to 15, 2017. Adult male seals were not counted on St. George Island in 2017 due to an extended period of canceled flights preventing observer access. Counts of territorial males with females (class 3; "harem" males) on St. Paul Island decreased by 9.6% compared to 2016. Idle males (classes 2 and 5,) on St. Paul Island increased in comparison to 2016 by 21.3%. Overall, the total number of adult males counted on St. Paul Island in 2017 increased by approximately 4.0% from 6,029 in 2016 to 6,268.


Table 1. Number of adult male northern fur seals counted, by rookery, Pribilof Islands, Alaska, July 2017.


* Adult males are assumed to be equal to or greater than 7 years of age. Class 2 – territorial without females; Class 3 – territorial with females; Class 5 – hauling ground males.
** Haulouts adjacent to the rookery were counted on a different day than the rookery area.


Northern Fur Seal Research, Adult Male Count Graphic
Northern Fur Seal Research, Adult Male Count Graphic

Figure 1. Northern fur seal adult males (harem, class 3 – thick line; idle, classes 2 and 5 – thin) counted on the Pribilof Islands 1975-2017. No counts were made on St. George Island in 2017.