Movement of rainbow trout (Oncorhynchus mykiss) during the spawning migration in the Tongariro River, New Zealand
作者:
M. Dedual,
I. G. Jowett,
期刊:
New Zealand Journal of Marine and Freshwater Research
(Taylor Available online 1999)
卷期:
Volume 33,
issue 1
页码: 107-117
ISSN:0028-8330
年代: 1999
DOI:10.1080/00288330.1999.9516861
出版商: Taylor & Francis Group
关键词: rainbow trout;spawning migration;fish movement;flow regime;volcanic eruption;radio‐telemetry
数据来源: Taylor
摘要:
The movements of 74 rainbow trout(Oncorhynchus mykiss)were monitored every 2–3 days using radio‐telemetry during the spawning migration up the Tongariro River, New Zealand, between June and November 1995. Contrary to the views of anglers, movements of individual fish were highly variable and upstream movement could not be predicted from environmental conditions and fish related variables (length, sex, and reproductive status). There was no significant difference in individual movement between male and female fish. When individual movements were in an upstream direction, maiden trout moved faster, but less often, than fish that had spawned in previous years. The flow in the lower river explained 9% of the variance in individual downstream movements. Net upstream movement occurred throughout most of the study period with above mean activity when the river was in spate, especially early in the migration season when fish responded to flow changes as low as 7%. Above mean upstream daily movement occurred 8 times on rising and 9 times on falling barometric pressure. Large floods caused downstream displacements, but fish tended to move up stream again on the flow recession. The most noticeable downstream movement occurred following the eruption of Mount Ruapehu.
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