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Accumulation of domoic acid in marine organisms from Sriracha bay, Chonburi province, Thailand

Oning Veschasit^a, Shettapong Meksumpun^a,b,c,*, Nissara Thawonsode^a, Thaithaworn Lirdwitayaprasit^d

 
ABSTRACT:     Domoic acid (DA), a toxin produced by diatoms Pseudo-nitzschia and Nitzschia, causes amnesic shellfish poisoning. DA accumulated in marine organisms from Sriracha bay, Chonburi province, Thailand was determined from May 2012 to July 2013. Field surveys and sample collections were conducted every two months. DA content was determined using the enzyme linked immunosorbent assay (ELISA) method and ranged between not detectable and 110 ng/l for plankton. DA content in zooplankton ranged between 0.04 and 0.21 ng/l and in Perna viridis, Crassostrea lugubris, and Pinctada fucata it ranged between 214 and 454, 171 and 371, and 117 and 282 ng/g, respectively. DA content in Secutor megalolepis ranged between not detectable and 44.2 ng/g. DA was found in zooplankton, shellfish, and fish from Sriracha bay throughout the year. The amount of DA accumulation in marine organisms was lower than the regulation level (20 µg/g). Average DA content in zooplankton, shellfish, and fish throughout the year were 42%, 44%, and 5% of the DA content in phytoplankton, respectively. DA transfers from phytoplankton to zooplankton and shellfish were 7% and 8%, respectively, while transfer from zooplankton to fish was 2%.

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* Corresponding author, E-mail: ffisspm@ku.ac.th

Received 29 Jun 2017, Accepted 6 Nov 2017