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Mortality of native fish from Waikato tributary: Disease diagnosis

Jones, J.B.ORCID: 0000-0002-0773-2007 (1994) Mortality of native fish from Waikato tributary: Disease diagnosis. Conservation Advisory Science Notes (67). pp. 1-5.

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Mr. Mike Harvey, President, New Zealand Native Fish Study Group submitted 12 banded kokopu ( Galaxias maculatus ), 1 bully ( Gobiomorphus cotidianus ) and 1 smelt ( Retropinna retropinna ) for examination on 11 Jan. 1994.

The fish, exhibiting symptoms of a disease, had been collected from a small bush run stream tidal in the lower reaches, about 5 km from the main Waikato River mouth. Mr. Harvey reported that the symptoms of infection first appeared in November and were more prevalent in December. Symptoms included raw red inflammation of the mouth parts, tail eaten away into the caudal peduncle, and open sores on the flanks. Fungal infection was present and the fish had a wasted appearance. Whitespot was also present in the stream. At the date of collection (7 Jan 1994), very few fish were seen other than freshly run whitebait. The usually abundant fish fauna was not in evidence.

All the fish had been fixed immediately after death on 7 Jan 1994, in 10% neutral buffered formalin. A smelt, two banded kokopu and a bully were post-mortemed by me on 11 Jan. 1994 and sections taken for histology.

Item Type: Journal Article
Publisher: New Zealand Government. Department of Conversation
Copyright: 1994 Department of Conservation
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