Distribution, biomass, and demographics of coastal pelagic fishes in the California Current Ecosystem during summer 2025 based on acoustic-trawl sampling

This report provides: 1) a detailed description of the acoustic-trawl method (ATM) used by NOAA’s Southwest Fisheries Science Center for direct assessments of the dominant coastal pelagic species (CPS; i.e.: Pacifc Sardine Sardinops sagax, Northern Anchovy Engraulis mordax, Pacifc Mackerel Scomber japonicus, Jack Mackerel Trachurus symmetricus, and Pacifc Herring Clupea pallasii) in the California Current Ecosystem of the west coast of the United States (U.S.), including changes related to the inaugural Integrated West Coast Pelagics Survey (IWCPS), which combined ATM surveys for Pacifc Hake (Merluccius productus) and CPS on the same ship; and 2) estimates of the biomasses, distributions, and demographics of those CPS encountered in the survey area between 3 June and 13 September 2025.