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USA-Mexico surveys of transboundary forage fishes in the California Current
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2024
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[PDF-5.42 MB]
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Journal Title:Exploración científica en territorio mexicano a bordo del Buque de Investigación
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Description:In the California Current Ecosystem (CCE), multiple forage fishes are monitored and managed by the United States of America (USA) and Mexico using information from acoustic-trawl method (ATM) surveys that combine information collected with echosounders and nets. Since 2006, the USA National Oceanic and Atmospheric Administration (NOAA) has conducted ATM surveys of Pacific Sardine and other coastal pelagic fish species (CPS) including Northern Anchovy, Pacific Mackerel, Jack Mackerel, Pacific Herring, and Round Herring. During these surveys, the echosounder sampling is done during daytime, when the fish form schools, and trawling is conducted during nighttime, when the CPS disperse near the surface to feed. The sampling domain is defined at the time of the survey by the modeled potential oceanographic habitat of the northern stock of Pacific Sardine as well as the anticipated distributions of other CPS in the USA and Canadian waters. The ship transects are augmented with interstitial transects sampled by uncrewed surface vehicles, and extended into shallow waters using smaller fishing vessels. Since 2021, to more accurately assess transboundary CPS stocks, NOAA and the Mexico Research Institute for Sustainable Fishing and Aquaculture (IMIPAS) standardized sampling instruments and analysis methods to concurrently survey the USA and Mexico waters. These surveys produce annual estimates of the distributions of eight stocks of six CPS, and their abundances apportioned to lengths and ages. The results may also yield indications of recruitment, and estimates of growth and natural mortality. The results from this IMIPAS-NOAA collaboration collectively yield information for the first observational assessments of multiple transboundary CPS stocks in the CCE, in the context of their changing environment. The Central Stock now dominates the forage fish assemblage in the CCE, and the southern stock of Pacific Sardine is increasingly persistent and abundant in the USA waters.
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