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Effects of Temperature on the Responses of Young Salmon to Water Currents

Miles H. A. Keenleyside and William S. Hoar
Behaviour
Vol. 7, No. 2/3 (1954), pp. 77-87
Published by: Brill
Stable URL: http://www.jstor.org/stable/4532806
Page Count: 11
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Effects of Temperature on the Responses of Young Salmon to Water Currents
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Abstract

The rheotactic responses of three species of juvenile Pacific salmon (genus Oncorhynchus) were studied under varying temperature conditions. Rheotaxis is predominantly positive at lower temperatures but frequently becomes actively negative at higher temperatures. A positive response was usual at temperatures which normally prevail during the seaward migration of these fish. The presence or absence of shelter may markedly modify rheotactic responses. If exposed to light young salmon may show a negative rheotaxis while a positive response occurs if shelter is available. /// Die rheotakischen Reaktionen bei Jungfischen dreier pacifischer Lachsarten (Oncorhynchus) wurden unter wechselnden Temperaturbedingungen untersucht. Die Rheotaxis ist bei niedrigen Temperaturen meist positiv, wird aber häufig, bei höheren Temperaturen, negativ, wobei die Fische sogar mit der Strömung mitschwimmen. Eine positive Reaktion wurde gewöhnlich beobachtet bei Temperaturen die normalerweise während der Seewartswanderung dieser Fische bestehen. Das Vorhandensein oder Nichtvorhandensein eines Versteckplatzes kann die rheotaktischen Reaktionen merklich ändern. Bei Belichtung können die Jungfische eine negative Rheotaxis zeigen, während sie bei Anwesenheit eines Versteckplatzes positiv reagieren.

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