Domoic Acid Contamination in Fish from Sriracha Bay, Chonburi Province, Thailand
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Abstract
Contamination of domoic acid, a marine biotoxin that causes amnesic shellfish poisoning (ASP), and could be transferred to humans through consumption of contaminated fish, was investigated in three species of fish (Siganus canaliculatus, Sardinella albella and Rastrelliger brachysoma) from Sriracha Bay, Chonburi Province, Thailand. Fish samples were collected every two months between May 2012 and July 2013. Body tissue and viscera of fish were examined for domoic acid content using enzyme-linked immunosorbent assay (ELISA) method. Results demonstrated contamination in all samples of S. canaliculatus, S. albella and R. brachysoma, with domoic acid content ranging between 0.32 and 48.64, ND-61.43, and ND-84.80 ngg-1 in body tissues, and between 51.66 and 276.29, 7.93 and 235.00, and 2.19 and 283.50 ng.g-1 in the viscera, respectively. Domoic acid content of S. canaliculatus was higher than R. brachysoma and S. albella. Average contents of domoic acid in S. canaliculatus and R. brachysoma during the dry season were significantly higher than during the wet season. Overall results indicated that the average domoic acid content in the body tissue of all fish sampled throughout the year was 13.91% (19.94 ng.g-1 wet weight); with domoic acid in the viscera of 152.54 ng.g-1 wet weight, an eight-fold increase. However, domoic acid content in the three fish species studied was lower than the safe consumption level of 20 µg.g-1, originally set in Canada.
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