From pup production to quotas: current status of harp seals in the Greenland Sea

• Published in: ICES Journal of Marine Science
• Main Authors: Øigård, Tor Arne, Haug, Tore, Nilssen, Kjell Tormod
• Format: Article in Journal/Newspaper
• Language: English
• Published: Oxford University Press (OUP) 2013
• Subjects: Ecology; Aquatic Science; Ecology, Evolution, Behavior and Systematics; Oceanography; Greenland; Greenland Sea; Harp Seal; North Atlantic; Pagophilus groenlandicus
• Online Access: http://dx.doi.org/10.1093/icesjms/fst155; http://academic.oup.com/icesjms/article-pdf/71/3/537/29145683/fst155.pdf

Abstract Harp seals (Pagophilus groenlandicus) have been harvested for centuries in the North Atlantic. Estimating abundance and monitoring changes in population size are critical for the management of the species. In March 2012, the harp seal pup production was estimated from aerial photographic surveys over the whelping areas. A total area of 305 km2 was photographed and 6034 pups were counted on the photos. From this the total pup production estimate was 89 590 ( s.e. = 12 310, CV = 13.7%). The status of the stock was subsequently assessed by fitting a population model to the independent pup production estimate, the historical catch data, and the historical reproduction data. The 2013 total abundance (including pups) was estimated to be 627 410 (95% CI = 470 540–784 280) harp seals. We demonstrate how the model is used in assessment when exploring the effect of various catch scenarios on future predictions.