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Estimation of nearshore aerial survey biomass for the 2021 stock assessment of the central subpopulation of Northern Anchovy (Engraulis mordax)
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2023
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[PDF-5.44 MB]
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Description:The fishery for the central subpopulation of Northern Anchovy (Engraulis mordax) along the U.S. Pacific Coast has been federally managed under the Coastal Pelagic Species (CPS) Fishery Management Plan since 2000 by the Pacific Fishery Management Council and the National Marine Fisheries Service. Prior to 2019, relative abundance indices derived from research surveys did not fully reflect the distribution of CPS in nearshore waters of < 40 m, an area where the fishing industry takes most of its catches. In 2012, the California Department of Fish and Wildlife (CDFW) and the California Wetfish Producers Association (CWPA) began collaborating on an aerial survey known as the California Coastal Pelagic Species Survey (CCPSS) covering Northern and Southern California nearshore waters. Since August 2018, CCPSS also included new research components to estimate bias and precision and validate species identifications of aerial observer biomass. These research efforts, known as the Nearshore Cooperative Survey (NCS), also provided biological data for developing age and length compositions of CCPSS biomass. This document describes CCPSS design and methods used for estimating Northern Anchovy biomass from aerial surveys conducted since 2015 and highlights the changes implemented for 2020-2021 surveys.
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Rights Information:CC0 Public Domain
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