Fur Seal Investigations, 1972
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Fur Seal Investigations, 1972

  • 1973

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    Field investigations were conducted on the Pribilof Islands and at sea from March to September 1972. The kill of fur seals was 37,314 males and 79 females. A count of living adult males in June totaled 6, 548; extrapolated estimates yielded 7,603 in July. Dead fur seals counted consisted of 25, 133 pups and 209 animals older than pups. We marked 25,019 pups of both sexes and recovered 4,029 marked males. Estimates based on mark-recapture data yielded 551,000 pups born in 1968 and 377,000 in 1969. Counts of dead pups on three mortality study areas were: Area 1, 73; Area 2, 41; and Area 3, 171. An additional rookery of northern fur seals was discovered on Castle Rock, a small rocky island near San Miguel Island. Counts of the colony at Adams Cove and the one at Castle Rock show a minimum population of over 600 animals. In 1972, 849 seals were sighted off Washington and 257 were collected; 25 were males ages 1 to 6 and 232 females ages 1 to 19. Squids (nine species) were the leading food item (34%); following were northern anchovy, Engraulis mordax (26%); Pacific herring, Clupea harengus pallasi (17%); rockfish, Sebastes sp. (8'10); and American shad, Alosa sapidissima (6'10). Salmonids (3.7'10) were the most valuable commercial fish eaten by fur seals collected off Washington in 19 72 .
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