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Fatal encephalitis due to the scuticociliate Uronema nigricans in sea-caged, southern bluefin tuna Thunnus maccoyii

By B. L. Munday, P. J. O\u27Donoghue, M. Watts, K. Rough and T. Hawkesford

Abstract

A syndrome characterized by atypical swimming behaviour followed by rapid death was first reported in captive southern bluefin tuna Thunnus maccoyii (Castelnau) in the winter of 1993. The cause of this behaviour was found to be a parasitic encephalitis due to the scuticociliate Uronema nigricans (Mueller). Based on parasitological and histological findings, it is proposed that the parasites initially colonise the olfactory rosettes and then ascend the olfactory nerves to eventually invade the brain. Possible epidemiological factors involved in the pathogenesis of the disease include water temperature (>18 degrees C) and the immune status of the fish

Topics: Southern bluefin tuna, Thunnus maccoyii, Scuticociliate, Uronema nigricans, Encephalitis, Neuritis, 1104 Aquatic Science, 1105 Ecology, Evolution, Behavior and Systematics
Publisher: Inter-Research
Year: 1997
DOI identifier: 10.3354/dao030017
OAI identifier: oai:espace.library.uq.edu.au:UQ:260569

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