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

journal contribution
posted on 2023-05-16, 10:42 authored by Munday, BL, ODonoghue, PJ, Watts, M, Rough, KM, Hawkesford, TM
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°C) and the immune status of the fish.

History

Publication title

Diseases of Aquatic Organisms

Volume

30

Pagination

17-25

ISSN

0177-5103

Department/School

Institute for Marine and Antarctic Studies

Publisher

Inter-Research

Place of publication

Oldendorf

Repository Status

  • Restricted

Socio-economic Objectives

Fisheries - aquaculture not elsewhere classified

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