
Most of the marine mammal monitoring activity is focussed on either commercially important species or threatened species.
Different methods are used for abundance estimation of the commercially important marine mammal species in the Barents Sea. Mark-recapture experiments have been conducted for determining the abundance of harp seals since the mid 1980s (e.g. Øien and Øritsland, 1995).



The overall goals of the seabird monitoring program are to evaluate the status and trends of seabird populations in relation to anthropogenic and natural environmental factors (Anker-Nilssen et al. 1996).
