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  • Fisheries, Pollution And Algology
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Direct observation of the behaviour of fish in relation to fishing gear

Direkte Beobachtung des Verhaltens von Fischen in Beziehung zu Fischfanggeräten

Helgoländer wissenschaftliche Meeresuntersuchungen volume 24, pages 348–360 (1973)Cite this article

Kurzfassung

Die Wirkungsweise des dänischen Grundschleppens beim Fang wurde von Tauchern vor der schottischen Küste in Tiefen bis zu 40 m untersucht. Die kontinuierlichen Gestaltsveränderungen des Netzes während des Schleppens ließen Vergleiche zu anderen Grundschleppnetzen zu. Auf Grund der geringen Schleppgeschwindigkeit konnten während des ganzen Fangprozesses Beobachtungen angestellt werden. Dem Verhalten von Schellfisch(Melanogrammus aeglifinus), Sandspierling(Ammodytes spec.), Scholle(Pleuronectes platessa) und Kliesche(Limanda limanda) vor und in dem Schleppnetz wurde besondere Aufmerksamkeit gewidmet. Der gleichzeitige Einsatz von Fotoapparat und Tonbandgerät ermöglichte es jedem Taucher, die Verhaltensweisen der einzelnen Arten mit Zeitangaben festzuhalten. Änderungen der relativen Zahl der Fische, ihrer Schwimmgeschwindigkeit und der Zeit ihres Aufenthaltes vor dem Netz ließen sich mit Änderungen der Netzgestalt, dem Verhalten der Trossen und der Schleppgeschwindigkeit korrelieren. Einige Verhaltensformen, die bei der Orientierung und beim Fang der Fische von Bedeutung sind, werden besprochen.

Summary

1. The behaviour of flatfish, haddock and sandeels near Danish seine nets was recorded by divers using cameras and tape-recorders.

2. Flatfish swam at right angles to moving seine net ropes and collected in front of the net groundline by a zigzag process.

3. The density of flatfish in the net mouth rose sharply when the net was about half closed, and then declined more gradually.

4. The duration of swimming of flatfish was not directly related to the speed of movement of the gear.

5. Haddock were herded by the ropes and appeared near the net much later than flatfish. When in the net mouth they showed an optomotor reaction to the net wings.

6. The duration of swimming of haddock in front of the net was not directly related to its speed.

7. Sandeels avoided the headline of the net but swam through the netting. Near the sea-bed they behaved like haddock.

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Authors and Affiliations

  1. Marine Laboratory, Aberdeen, Scotland

    C. C. Hemmings

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  1. C. C. Hemmings
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Hemmings, C.C. Direct observation of the behaviour of fish in relation to fishing gear. Helgolander Wiss. Meeresunters 24, 348–360 (1973). https://doi.org/10.1007/BF01609525

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Keywords

Helgoland Marine Research

ISSN: 1438-3888

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