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Identification and seasonal occurrence of potentially toxic Pseudo-nitzschia diatoms in oyster growing estuaries of New South Wales, Australia

Citation

Ajani, P and Murray, S and Hallegraeff, G and Brett, S and Webster, G and Armand, L, Identification and seasonal occurrence of potentially toxic Pseudo-nitzschia diatoms in oyster growing estuaries of New South Wales, Australia, Proceedings of the 9th International Conference on Molluscan Shellfish Safety, 17-22 March 2013, Sydney, Australia, pp. 100-103. ISBN 978-0-646-92993-4 (2014) [Refereed Conference Paper]


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Abstract

Species belonging to the potentially toxic diatom genus Pseudo-nitzschia are a significant component of the phytoplankton community in south-east Australian waters. Toxigenic representatives of this genus produce domoic acid and are responsible for the majority of regulatory exceedances in New South Wales (NSW) oyster-growing estuaries. This toxic genus has been implicated in 6 toxic events during the sampling period 2005-2009 (max. concentration of 34 mg DA kg-1 oyster tissue). However, identification to species level is difficult and requires both electron microscopy and molecular techniques for unambiguous identification. Detailed analyses revealed 10 different species in NSW coastal waters, Pseudo-nitzschia americana, P. arenysensis, P. calliantha, P. cuspidata, P. fraudulenta, P. hasleana, P. micropora, P. multiseries, P. multistriata and P. pungens, including two confirmed domoic acid producers, P. cuspidata (25.4 pg DA cell-1) and P. multistriata (11 pg DA cell-1). Species diversity and the seasonal occurrence of regulatory Pseudo-nitzschia groupings have important implications for monitoring and management of shellfish harvest areas in NSW. The ubiquitous species, Pseudo-nitzschia cuspidata, represents the greatest challenge for coastal shellfish culture in NSW.

Item Details

Item Type:Refereed Conference Paper
Keywords:toxic Pseudo-nitzschia diatoms, oyster growing estuaries of New South Wales
Research Division:Biological Sciences
Research Group:Plant Biology
Research Field:Phycology (incl. Marine Grasses)
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Aquaculture
Objective Field:Fisheries - Aquaculture not elsewhere classified
Author:Hallegraeff, G (Professor Gustaaf Hallegraeff)
ID Code:96441
Year Published:2014 (online first 2013)
Deposited By:IMAS Research and Education Centre
Deposited On:2014-11-05
Last Modified:2015-11-12
Downloads:0

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