DOMOIC ACID PRODUCTION IN NITZSCHIA SP. (BACILLARIOPHYCEAE) ISOLATED FROM A SHRIMP-CULTURE POND IN DO SON, VIETNAM |
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| Authors: | Yuichi Kotaki Kazuhiko Koike Makoto Yoshida Chu Van Thuoc Nguyen Thi Minh Huyen Nguyen Chu Hoi Yasuwo Fukuyo Masaaki Kodama |
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| Institution: | School of Fisheries Sciences, Kitasato University, Sanriku, Iwate 022-0101, Japan;Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo, Tokyo 113-8657, Japan;Haiphong Institute of Oceanology, Da Nang Street, Haiphong, Vietnam;Asian Natural Environmental Science Center, The University of Tokyo, Yayoi, Bunkyo, Tokyo 113-8657, Japan;School of Fisheries Sciences, Kitasato University, Sanriku, Iwate 022-0101, Japan |
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| Abstract: | Domoic acid (DA), a neuroexcitatory amino acid, was detected in batch culture of the newly recognized species Nitzschia navis-varingica Lundholm et Moestrup . The production of DA by this diatom was confirmed by electrospray ionization mass spectrometry. The diatom was collected from a shrimp-culture pond in Do Son, Vietnam. The production of DA (1.7 pg·cell ? 1) is within the levels reported for Pseudo-nitzschia multiseries (Hasle) Hasle. The DA production started during the late exponential growth phase and reached a maximum during the early stationary growth phase. Maximum DA levels in the axenic culture decreased to about half that of the nonaxenic culture (0.9 pg·cell ? 1 vs. 1.7 pg·cell ? 1), suggesting that DA production by the new species is influenced by bacteria. |
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| Keywords: | amnesic shellfish poisoning benthic diatom domoic acid Nitzschia sp Vietnam |
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