batch_auto_20260713 202607131256465730 BOEM ESP geoESPIS ESPIS@boem.gov Bureau of Ocean Energy Management Gulf of Mexico Marine Assessment Program for Protected Species (GOMMAPPS): Marine Mammal Fieldwork and Data Analysis National Marine Fisheries Service, Southeast Fisheries Science Center National Oceanic and Atmospheric Administration Line-transect surveys designed for marine mammal and sea turtle abundance estimation were conducted in the Northern Gulf of Mexico (NGOM) to inform the development of spatially-explicit density models (SDMs). Abundance estimates were updated for 26 marine mammal stocks and SDMs were developed for 15 marine mammal species and four sea turtle species. Overall, there appear to be decreases in both the number of species and number of individuals of small whale and oceanic delphinids in recent years. Additionally, reduced productivity in the Northeastern GOM in recent years appears to have resulted in a shift of some species into the Western GOM. 3700000 U.S. Department of the Interior, Bureau of Ocean Energy Management, Environmental Studies Program https://doi.org/10.13039/100012475 M17PG00013 10.67297/9A1DE7 https://boem.gov/awardpages/100199