The study is based on stomach contents from 247 porpoises bycaught or stranded between 1985 and 1990. A minimum of 30 species of fish were identified, representing 16 families. Off northern Norway, capelin (Mallotus villosus) was an important species. In Scandinavian waters as a whole, herring (Clupea harengus) was the single most important species in the diet. Clupeidae and Gadidae were the most common prey families. Differences between the diet in the northern and southern part of the study area are related to the geographical distribution of some of the prey species, but can also be related to differences in bathymetry.
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