Pup production and sustainable yield of white sea harp seals
Research report
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http://hdl.handle.net/11250/114746Utgivelsesdato
1979Metadata
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Pup production and sustainable yield of White Sea harp seals.FiskDir.
Skr. Ser. HavUnders., 16: 551-559.
Pup production from 1962 to 1965 was estimated by a survival index method from age
composition of Norwegian samples of moulting harp seals collected in the southeastern
Barents Sea from 1964 to 1972.
Pup production decreased from 130 thousand in 1962 to 98 thousand in 1965. From these
estimates production was projected forward to give an estimate of 172 thousand pups produced
in 1978, corresponding to a total stock of one year old and older harp seals of about 800
thousand. Both the projection and the number of adult females in the whelping patches
estimated from Soviet aerial surveys give an annual increase of about 5% since 1968. The
sustainable yield for 1978 is estimated at 98 thousand pups and 8 thousand one year and older
animals.
Utgiver
[Fiskeridirektoratets havforskningsinstitutt]Serie
Fiskeridirektoratets skrifter, Serie Havundersøkelservol 16 no 14