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Karenia asterichroma sp. nov. (Gymnodiniales, Dinophyceae), a new dinoflagellate species associated with finfish aquaculture mortalities in Tasmania, Australia

Citation

de Salas, MF and Bolch, CJS and Hallegraeff, GM, Karenia asterichroma sp. nov. (Gymnodiniales, Dinophyceae), a new dinoflagellate species associated with finfish aquaculture mortalities in Tasmania, Australia, Phycologia, 43, (5) pp. 624-631. ISSN 0031-8884 (2004) [Refereed Article]

DOI: doi:10.2216/i0031-8884-43-5-624.1

Abstract

A new species of unarmoured dinoflagellate is described from Tasmanian field samples and laboratory cultures: Karenia asterichroma de Salas, Bolch & Hallegraeff, sp. nov. This species is characterized by the use of light and scanning electron microscopy and sequencing of the 26S ribosomal RNA gene. Karenia asterichroma is a dorsoventrally flattened cell resembling K. brevis, although it differs from this species by 4.5% in the D1-D3 regions of its 26S ribosomal DNA (rDNA) sequence. Unlike other Karenia species, the epicone of K. asterichroma has concave sides and the chloroplasts radiate from a central, putative pyrenoid. The nucleus is located in the centre of the epicone and the apical groove is long, extending ventrally to near a broad sulcal extension into the epicone. Partial 26S rDNA sequences indicate a relationship with K. bicuneiformis. Although the ichthyotoxicity of K. asterichroma is yet to be confirmed, it was associated (with three other Karenia species) with a recent mass mortality of over 100,000 caged salmonids at an aquaculture operation in southern Tasmania, Australia.

Item Details

Item Type:Refereed Article
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:de Salas, MF (Dr Miguel de Salas)
Author:Bolch, CJS (Dr Christopher Bolch)
Author:Hallegraeff, GM (Professor Gustaaf Hallegraeff)
ID Code:31112
Year Published:2004
Web of Science® Times Cited:23
Deposited By:Plant Science
Deposited On:2004-08-01
Last Modified:2005-06-08
Downloads:0

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