Diurnal Variations in Swimming Activity of Rutilus rutilus (Cyprinidae) in a Group under Tank Conditions
Identifieur interne : 001373 ( Main/Exploration ); précédent : 001372; suivant : 001374Diurnal Variations in Swimming Activity of Rutilus rutilus (Cyprinidae) in a Group under Tank Conditions
Auteurs : Cornelius Hammer [Allemagne] ; Axel Temming [Allemagne] ; Hans-Joachim Schubert [Allemagne]Source :
- Internationale Revue der gesamten Hydrobiologie und Hydrographie [ 0020-9309 ] ; 1994.
English descriptors
Abstract
Measurements of the swimming activity of a group of roach (12–19 cm TL, average) in a circular swimming chamber revealed two distinct activity patterns: a diurnal and a nocturnal one. The experiments showed that, having the choice, two factors stimulated the rhythmicity of the swimming behaviour of the fish, i.e. light intensity and the presence of a current field in the proximity of the fish. During daytime (bright light conditions) the fish moved into the current field and swam on average at 0.4 BL/s (resting swimming). The roach remained swimming at this speed even if no current field was established, however, then distributed evenly in the basin. By contrast, during night (dim light conditions) the fish predominantly chose the still water section but swam on average with a cruising speed of 1.6 BL/s (night swimming). Accordingly, they did not seek the still water section for night swimming if the light was kept on. Then again, the fish distributed more or less evenly in the basin. The results support the hypothesis that the fish migrate during night‐time and do this preferably in still water.
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DOI: 10.1002/iroh.19940790308
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The experiments showed that, having the choice, two factors stimulated the rhythmicity of the swimming behaviour of the fish, i.e. light intensity and the presence of a current field in the proximity of the fish. During daytime (bright light conditions) the fish moved into the current field and swam on average at 0.4 BL/s (resting swimming). The roach remained swimming at this speed even if no current field was established, however, then distributed evenly in the basin. By contrast, during night (dim light conditions) the fish predominantly chose the still water section but swam on average with a cruising speed of 1.6 BL/s (night swimming). Accordingly, they did not seek the still water section for night swimming if the light was kept on. Then again, the fish distributed more or less evenly in the basin. The results support the hypothesis that the fish migrate during night‐time and do this preferably in still water.</div></front></TEI><affiliations><list><country><li>Allemagne</li></country><region><li>Hambourg</li></region><settlement><li>Hambourg</li></settlement></list><tree><country name="Allemagne"><region name="Hambourg"><name sortKey="Hammer, Cornelius" sort="Hammer, Cornelius" uniqKey="Hammer C" first="Cornelius" last="Hammer">Cornelius Hammer</name></region><name sortKey="Schubert, Hans Oachim" sort="Schubert, Hans Oachim" uniqKey="Schubert H" first="Hans-Joachim" last="Schubert">Hans-Joachim Schubert</name><name sortKey="Temming, Axel" sort="Temming, Axel" uniqKey="Temming A" first="Axel" last="Temming">Axel Temming</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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