This report presents revised stock assessments for 30 Pacific marine mammal stocks under NMFS jurisdiction, including four new stocks from Hawaiian waters (Barlow 2003): Sei whale (Balaenoptera borealis), minke whale (Balaenoptera acutorostrata), Fraser’s dolphin (Lagenodelphis hosei), and Longman’s beaked whale (Indopacetus pacificus). Information on the remaining 31 Pacific region stocks is reprinted without revision in this report and also appears in the 2003 reports (Carretta et al. 2003).