New Zealand Journal of Marine and Freshwater Research abstracts

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Short communication 

Record of a wild intersexual rainbow trout (Oncorhynchus mykiss) in Taupo, New Zealand

Michel Dedual

Department of Conservation
Taupo Fishery Area
Private Bag, Turanga Place
Turangi, New Zealand
email: mdedual@doc.govt.nz

Abstract  For the first time in Taupo and in New Zealand an intersexual rainbow trout (Oncorhynchus mykiss) was identified. The fish was caught during the spawning migration by an angler fishing in the Tongariro River in June 2001. The external appearance of the fish had more male than female features. The fish had testes and ovaries distributed in a typical “lobular” form. The isolated nature of such occurrence of intersexual trout in Taupo and the high water quality in the catchment suggest that this phenomenon was most likely spontaneous rather than induced by environmental contamination.

Keywords  rainbow trout; wild; intersexual; gonads; Taupo; New Zealand

M02082 Received 17 October 2002; accepted 30 April 2003; Published 5 August 2003
New Zealand Journal of Marine and Freshwater Research, 2003, Vol. 37: 521-523
0028-8330/03/3703-0521 $7.00 © The Royal Society of New Zealand 2003

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