Diatom Pseudo-nitzschia cf. caciantha (Bacillariophyceae) the most likely source of domoic acid contamination in the thorny oyster Spondylus versicolor Schreibers 1793 in Nha Phu Bay Khanh Hoa Province Vietnam

Pham Xuan Ky, . and Po Teen Lim, . and Sing Tung Teng, . and Omura Takuo, . and Dao Viet Ha, . and Fukuyo Yasuwo, . and Takata Yoshinobu, . and Kodama Masaaki, . Diatom Pseudo-nitzschia cf. caciantha (Bacillariophyceae) the most likely source of domoic acid contamination in the thorny oyster Spondylus versicolor Schreibers 1793 in Nha Phu Bay Khanh Hoa Province Vietnam. pp. 16-29. ISSN 0116-6514

Domoic acid (DA) contamination in the thorny oyster Spondylus versicolor Schreibers 1793 was discovered in 2005 in Nha Phu Bay Khanh Hoa Province Vietnam. Concurrently DA was detected in the net-plankton samples. The causative organism responsible for the DA was not detected then. In 2006 DA in S. versicolor (maximum of 43.6 gg-1) and in net-plankton samples (maximum of 0.78 ngL-1) recurred suggesting the existence of DA producers in the bay. When DA in S. versicolor again increased in 2007 a net-plankton sample was collected and cultures of Pseudo-nitzschia species were established for DA analysis and species identification. Eight out of eleven cultured isolates of Pseudo-nitzschia spp. showed DA production (111“244 ngmL-1) as confirmed by liquid chromatography-tandem mass spectroscopy. The toxic isolates examined by transmission electron microscopy shared identical morphological characteristics: a single row of poroids hymens divided into 2“6 sectors and mantles 1“2 poroids high. They resembled Pseudo-nitzschia caciantha Lundholm Moestrup Hasle 2003 thus we designated it as P. cf.caciantha. Our results indicated that P. cf. caciantha most likely contributed to the DA contamination in S. versicolor in Nha Phu Bay. This is the first report of DA production by P. cf. caciantha anywhere in the world.

Full text available from: Official URL: https://www.asianfisheriessociety.org/publication/...

Abstract

Domoic acid (DA) contamination in the thorny oyster Spondylus versicolor Schreibers 1793 was discovered in 2005 in Nha Phu Bay Khanh Hoa Province Vietnam. Concurrently DA was detected in the net-plankton samples. The causative organism responsible for the DA was not detected then. In 2006 DA in S. versicolor (maximum of 43.6 gg-1) and in net-plankton samples (maximum of 0.78 ngL-1) recurred suggesting the existence of DA producers in the bay. When DA in S. versicolor again increased in 2007 a net-plankton sample was collected and cultures of Pseudo-nitzschia species were established for DA analysis and species identification. Eight out of eleven cultured isolates of Pseudo-nitzschia spp. showed DA production (111“244 ngmL-1) as confirmed by liquid chromatography-tandem mass spectroscopy. The toxic isolates examined by transmission electron microscopy shared identical morphological characteristics: a single row of poroids hymens divided into 2“6 sectors and mantles 1“2 poroids high. They resembled Pseudo-nitzschia caciantha Lundholm Moestrup Hasle 2003 thus we designated it as P. cf.caciantha. Our results indicated that P. cf. caciantha most likely contributed to the DA contamination in S. versicolor in Nha Phu Bay. This is the first report of DA production by P. cf. caciantha anywhere in the world.

[error in script]

Item Type:	Article
AGROVOC Term:	Bacillariophyceae
AGROVOC Term:	Contamination
AGROVOC Term:	Spondylus versicolor
AGROVOC Term:	Oysters
AGROVOC Term:	Plankton
AGROVOC Term:	Mass spectroscopy
AGROVOC Term:	Electron microscopy
AGROVOC Term:	Intoxication
AGROVOC Term:	Poisoning
AGROVOC Term:	Identification
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:28
URI:	http://webagris.upm.edu.my/id/eprint/23691

Actions (login required)

View Item