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  • Long term egg thiamine monitoring in salmonid populations in California; 2020-2023
  • Ward, Abigail E; Academic Researcher; University of California, Davis
    Johnson, Rachel; Research Fisheries Biologist; National Marine Fisheries Service Southwest Fisheries Science Center
    Mantua, Nate; Program Lead, Landscape and Seascape Ecology; National Marine Fisheries Service Southwest Fisheries Science Center
    Jeffres, Carson; Senior Researcher; University of California, Davis
    Rinchard, Jacques; Faculty Researcher; State University of New York, Brockport
    Ludwig, Jarrod; Graduate Student; State University of New York, Brockport
    Daniels, Miles; Assistant Researcher; University of California, Santa Cruz
    Williams, Thomas; Research Fish Biologist; National Marine Fisheries Service Southwest Fisheries Science Center
    Lipscomb, Taylor; National Hatchery Operations Coordinator; U.S. Fish and Wildlife Service
  • 2024-12-26
  • Ward, A.E., R. Johnson, N. Mantua, C. Jeffres, J. Rinchard, J. Ludwig, M. Daniels, T. Williams, and T. Lipscomb. 2024. Long term egg thiamine monitoring in salmonid populations in California; 2020-2023 ver 1. Environmental Data Initiative. https://doi.org/DOI_PLACE_HOLDER (Accessed 2024-12-27).

  • Monitoring of egg thiamine levels was initiated in California hatcheries in 2020 after thiamine deficiency complex (an insufficiency of vitamin B1) was first documented in this system resulting in widespread mortality of juveniles. Unfertilized eggs (~10g) from mature adult females were collected from populations of Chinook salmon (Oncorhynchus tshawytscha), Steelhead trout (Oncorhynchus mykiss), and coho salmon (Oncorhynchus kisutch) across California to assess thiamine concentrations. Concurrent fork length, weight, as well as coded wire tag recovery information was recorded alongside egg thiamine concentration levels. Additionally, laboratory investigations have been undertaken to uncover the relationship between egg thiamine concentration and the survival of offspring. Utilizing these findings, we have understood the potential population-level impacts of thiamine-dependent mortalities based on egg surveillance data. The annual monitoring of eggs from salmonid species in both Central Valley and coastal populations serves as a critical component in comprehending the prevalence, magnitude, and tends of this deficiency among California salmonids. This dataset is focused on supporting research and providing in season data to inform the public and research managers responding to this emerging threat. Given the value of this information to managing salmon resources and treatments, we expect this monitoring to continue into the future if funding allows.

  • N: 41.978397      S: 36.971523      E: -120.109131      W: -124.437744
  • edi.1782.1  (Uploaded 2024-12-26)  
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  • DOI PLACE HOLDER
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