In this chapter we handle species of particular conservation concern due to their population status. These are the species present in the Barents Sea area and also listed on the Global Red List (IUCN, 2008), the Russian Red Data book (Danilov-Danilyan et al., 2001) and/or the Norwegian Red List (Kålås et al., 2006). In this report the groups of species included are restricted to mammals, birds and fish species. This is caused by the general lack of knowledge and lack of relevant assessments for the other taxonomic groups for the Barents Sea area. Some information is available in the Norwegian 2006 Red List, but both the Global Red List and the Russian Red Data Book include to a minor degree such assessments. For future reports the goal should be to include a far broader spectre of taxonomic groups.