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Upstream migration activity of cyprinids and percids in a channel, monitored by a horizontal split-beam echosounder

Published online by Cambridge University Press:  15 July 2003

Juha Lilja ,
Tapio Keskinen ,
Timo J. Marjomäki ,
Pentti Valkeajärvi  and
Juha Karjalainen
Juha Lilja*
Affiliation:
University of Jyväskylä, Department of Biological and Environmental Science, P.O. Box 35, 40351, Jyväskylä, Finland
Tapio Keskinen
Affiliation:
University of Jyväskylä, Department of Biological and Environmental Science, P.O. Box 35, 40351, Jyväskylä, Finland
Timo J. Marjomäki
Affiliation:
University of Jyväskylä, Department of Biological and Environmental Science, P.O. Box 35, 40351, Jyväskylä, Finland
Pentti Valkeajärvi
Affiliation:
Finnish Game and Fisheries Research Institute, Laukaa Fisheries Research and Aquaculture, Vilppulantie 415, 41360, Valkola, Finland
Juha Karjalainen
Affiliation:
University of Jyväskylä, Department of Biological and Environmental Science, P.O. Box 35, 40351, Jyväskylä, Finland
*
julilja@cc.jyu.fi
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Abstract

A 200 kHz digital echosounder (HTI) with two split-beam transducers was aimed horizontally to monitor the upstream migration activity of fish, from 24 April to 28 June, in Äijälänsalmi channel (mean width 35 m, length 700 m, and maximum depth 5 m) from large mesotrophic Lake Päijänne to small eutrophic Lake Jyväsjärvi. This study was part of a larger project which aims to analyse the movement of commercially unimportant fish species and reduce the abundance of these fish in L. Jyväsjärvi. Catch samples were collected with a trap net located immediately upstream from the acoustic beams. The most common species in the catch were roach (Rutilus rutilus), perch (Perca fluviatilis), bream (Abramis brama), ruffe (Gymnocephalus cernuus), and white bream (Abramis bjoerkna). The upstream migration of fish was correlated with water temperature (r = 0.40) with time lag of 1 d. In spring, L. Jyväsjärvi warmed faster than L. Päijänne, causing spawning migration from L. Päijänne to L. Jyväsjärvi. Clear diurnal rhythm in activity was observed. The migration rate through the channel peaked around dawn and dusk. Catch per unit effort of the trap net suggested that the peak of the spawning migration of different species was separate. Upstream migration was induced by the temperature difference between two lakes, and the activity of the migration was regulated by temperature changes and light rhythm.

Keywords

Horizontal acousticsMigrationTemperatureDiel rhythmCyprinidsPercids
Type
Research Article
Information
Aquatic Living Resources , Volume 16 , Issue 3: Acoustics in Fisheries and Aquatic Ecology. Part 2 , July 2003 , pp. 185 - 190
Copyright
© Elsevier, IRD, Inra, Ifremer, Cemagref, 2003

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