New Zealand Journal of Marine and Freshwater Research abstracts
M00002Received 10 January 2000; accepted 10 May 2000
Distribution and movements of brown (Salmo trutta) and rainbow trout
(Oncorhynchus mykiss) in Lake Otamangakau, central North Island, New
Zealand
M. DEDUAL
I. D. MAXWELL*
Department of Conservation
Private Bag
Turangi, New Zealand
email: mdedual@doc.govt.nz
J. W. HAYES
R. R. STRICKLAND
Cawthron Institute
Private Bag 2
Nelson, New Zealand
*Present adress: Eastern Fish and Game, Paradise Valley Rd,
Private Bag 3010, Rotorua, New Zealand.
Abstract The post-spawning movements and distribution of 15
brown trout (Salmo trutta Linnaeus 1758) and 21 rainbow trout
(Oncorhynchus mykiss Richardson, 1836) were monitored weekly
between August 1996 and March 1997 in the hydro-electric reservoir, Lake
Otamangakau, New Zealand, using radio-telemetry. The most frequently used areas
were the vicinity of the main inflow and the channel running through the main
body of the lake. After spawning, brown trout regained rapidly their usual
habitat. Rainbow trout were using the inlet intensively before recolonising the
main channel of the lake. Brown trout made greater use of the weedy parts of
the lake and littoral margins, had a more confined home range, and were less
mobile than rainbow trout. Rainbow trout occupied the main body of the lake by
day, and moved nearer the surface, and closer to the margins, at night. High
lake levels allowed brown trout to exploit wetland margins of the lake.
Keywords brown trout; Salmo trutta; rainbow trout;
Oncorhynchus mykiss; fish location; water temperature; oxygen content;
lake current
New Zealand Journal of Marine and Freshwater Research, 2000, Vol. 34:
629-636
0028-8330/00/3404-0629 $7.00 (c) The Royal Society of New Zealand
2000
PDF file of entire paper: medium quality (849K); (scanned from paper original: notes about this process)
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