Comments: Still abundant in the North Atlantic, but incidental mortality occurs in association with the mackerel fishery in the western North Atlantic (IUCN 1991) (see also ECONCOM). Not subject to exploitation in the southern hemisphere (IUCN 1991). Relatively high cadmium and mercury levels have been reported in animals taken in the Faroes (IUCN 1991). Canadian population faces no immediate threats, but recovery from earlier depletion by drive fisheries has been slow due probably to incidental entrapments, pollutants, and depletion of prey species (Nelson and Lien 1996).
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