New Zealand Journal of Marine and Freshwater Research abstracts
Short communication
Some pathological abnormalities of New Zealand fishes
B. K. Diggles
National Institute of Water and Atmospheric
Research Limited
P.O. Box 14 901, Kilbirnie
Wellington, New Zealand
email: b.diggles@niwa.cri.nz
Abstract A number of pathological abnormalities previously
unrecorded in New Zealand fishes are described. A silver trevally (Pseudocaranx
dentex) captured from the Bay of Islands exhibited swim bladder ectasia.
Black oreo (Allocyttus niger) and smooth oreo (Pseudocyttus maculatus)
had cysts of unknown aetiology (CUEs) in the gills at prevalences up to 76%
and 81%, respectively, in some fishing areas. The CUEs appear long lived
and may have some utility for stock discrimination. A hoki (Macruronus
novaezelandiae) with X-cell pseudotumours in the gill was recorded from
the Chatham Rise. Alfonsino (Beryx splendens) had conspicuous Kudoa
sp. cysts in the gills at prevalences of up to 28%. Smelt (Retropinna
retropinna) from the Waikato River were infected with a xenoma forming,
Glugea-like microsporidian.
Keywords fish; diseases; parasites; pseudotumours; myxosporea;
microsporea
M03012 Received 19 March 2003; accepted 24 June 2003; Online publication
date 31 October 2003
New Zealand Journal of Marine and Freshwater Research, 2003, Vol. 37:
705-713
0028-8330/03/3704-0705 $7.00 © The Royal Society of New Zealand
2003
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