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Diel vertical migration of European hake Merluccius merluccius and associated temperature histories: insights from a pilot data-storage tagging (DST) experiment

Authors

  • H. De Pontual,

    Corresponding author
    1. Ifremer, Unité Sciences et Technologies Halieutiques, Z.I. Pointe du diable, BP 70, 29280 Plouzané, France
      Tel.: +33 298 224 692; email: helene.de.pontual@ifremer.fr
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  • A. Jolivet,

    1. Ifremer, Unité Sciences et Technologies Halieutiques, Z.I. Pointe du diable, BP 70, 29280 Plouzané, France
    2. Université de Bretagne Occidentale, Institut Universitaire Européen de la Mer, Laboratoire des Sciences de L’Environnement Marin (UMR CNRS 6539), Technopôle Brest Iroise, Place Nicolas Copernic, 29280 Plouzané, France
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  • M. Bertignac,

    1. Ifremer, Unité Sciences et Technologies Halieutiques, Z.I. Pointe du diable, BP 70, 29280 Plouzané, France
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  • R. Fablet

    1. Institut TELECOM, TELECOM Bretagne, UMR CNRS 3192 Lab-STICC, Technopôle Brest Iroise CS 83818, 29238 Brest Cedex, France
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Tel.: +33 298 224 692; email: helene.de.pontual@ifremer.fr

Abstract

A pioneering experiment of archival tagging of European hake Merluccius merluccius provided evidence of a diel vertical migration pattern which was analysed using an automatic method, developed and validated through time-frequency analyses. Frequent vertical movements across the thermocline were observed and fish experienced rapid temperature changes >7° C. These tagging–recapture data also suggested a homing behaviour to feeding grounds.

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