New Zealand Journal of Marine and Freshwater Research abstracts

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Thermal avoidance in inanga, Galaxias maculatus (Jenyns), from the Waikato River, New Zealand

JACQUES A. BOUBEE

KATHRYN P. SCHICKER

ALLEN G. STANCLIFF

Waikato Fisheries Consultants Ministry of Agriculture and Fisheries P. O. Box 445, Hamilton, New Zealand

Abstract Temperature avoidance behaviour of inanga, Galaxias maculatus, was studied in the laboratory using a two-choice tank. The final preferred temperature of inanga is about 20°C but fish acclimatised to cooler temperatures (15 and 17°C) prefer warmer waters (up to 23 and 26°C, respectively). Fish acclimatised to temperatures of 15,17, and 20°C showed total avoidance at 29.5,31, and 31.5°C, respectively. Water temperature therefore is an important factor influencing upstream migration and distribution of inanga and thermal discharges can be disruptive.

Keywords Galaxias maculatus; inanga; New Zealand; power station; temperature avoidance; temperature preference; Waikato River

New Zealand Journal of Marine and Freshwater Research, 1991, Vol. 25: 177-180 0028-8330/2502-0177 $2.50/0 © Crown copyright 1991
Received 27 June 1990; accepted 11 April 1991

PDF file of entire paper: medium quality (328K); (scanned from paper original: notes about this process)

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