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Light (LM) and scanning electron micrographs (SEM) of Azadinium poporum (strain 967B8) associated with a newly identified azaspiracid toxin. (I) LM, living cell, note the presence of two pyrenoids (starch storage) (arrows) and (J–L) SEM of theca in (J) ventral view and (K) apical view. (L) Detailed view of the apical pore complex with the ventral pore (vp). Plate labels according to the Kofoidean (plate nomenclature) system. cp = cover plate, X = X-plate, vp = ventral pore, po = pore plate. Scale bars = 2 mm, except L, where it is 1 mm. Credit: Kim et al. 2017

NOAA Aids Efforts to Manage Risks from Lipophilic Shellfish Toxins in Washington

Published on: 06/14/2018
Primary Contact(s): marc.suddleson@noaa.gov

MERHAB Azadinium sampling in Puget Sound and the Washington outer coast. Sampling sites for twice-monthly mussel and SPATT deployment plus weekly water collection from April 2 – Sept 28, 2018.Water samples are analyzed for Azadinium species using molecular probes; mussels and SPATT are analyzed for azaspiracid toxins. SPATT = Solid Phase Adsorption Toxin Tracking, numbers in red boxes are locations of SPATT and mussel deployment and collection. Credit: NOAA

In April, an NCCOS-funded research team began its third and final field season measuring concentrations of marine algae and their associated lipophilic (fat soluble) toxins in Puget Sound and on the Olympic coast. These toxins can accumulate in shellfish and cause human illnesses known as diarrhetic shellfish poisoning (DSP) and azaspiracid shellfish poisoning (AZP) when consumed.

The team, led by NOAA's Northwest Fisheries Science Center (NWFSC), is working with the Washington State Department of Health and the Jamestown S’Klallam Tribe to better understand the health risks associated with these toxins and develop ways to better mitigate their impacts on Washington’s recreational, subsistence, and commercial shellfisheries.

Since the NCCOS MERHAB project began in 2016, four species of marine algae in the genus Azadinium have been isolated from Puget Sound (A. poporum, A. cuneatum, A. obesum, and A. dailianense), with strains of A. poporum found to be toxic. A new azaspiracid toxin was identified and named AZA-59. The team detected AZA-59 in low levels in Puget Sound (Kim et al., 2018). The MERHAB team is also optimizing methods for monitoring harmful algae and toxins in the field, and, with NCCOS expertise, is developing a quantitative toxin detection protocol for use in regulatory decisions.

Project partners at Washington State Department of Health, Jamestown S’Klallam Natural Resources Department, SoundToxins, and Olympic Region Harmful Algal Bloom/ORHAB are discussing ways to sustain the successfully piloted monitoring protocols. NCCOS's Monitoring and Event Response for Harmful Algal Blooms (MERHAB) Research Program provided funding for the project.

See NWFSC’s project website for the latest updates and news.

For more information, contact Marc.Suddleson@noaa.gov.

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