Journal of Comparative Physiology A

, Volume 155, Issue 5, pp 673–679

Learned magnetic field discrimination in yellowfin tuna,Thunnus albacares

  • Michael M. Walker

DOI: 10.1007/BF00610853

Cite this article as:
Walker, M.M. J. Comp. Physiol. (1984) 155: 673. doi:10.1007/BF00610853


  1. 1.

    Yellowfin tuna,Thunnus albacares, were trained individually to discriminate between two Earth-strength magnetic fields by differential reinforcement of a swimming response.

  2. 2.

    Seven subjects, of which two were trained with a double blind procedure designed to control for the possibility of cues from the experimenter, learned to discriminate between ambient and altered fields (Figs. 1–3).

  3. 3.

    Two additional fish trained with the same double blind procedure failed to discriminate between two magnetic fields in which the gradients of intensity were equal and opposite (Fig. 4).

  4. 4.

    The results suggest that the responses to magnetic fields by yellowfin tuna are neurally mediated and that magnetic field detection by this species can be analyzed by the same means as other sensory modalities.




intertrial interval

Copyright information

© Springer-Verlag 1984

Authors and Affiliations

  • Michael M. Walker
    • 1
    • 2
  1. 1.Southwest Fisheries Center Honolulu Laboratory, National Marine Fisheries ServiceNational Oceanic and Atmospheric AdministrationHonolulu
  2. 2.Department of ZoologyUniversity of HawaiiHonoluluUSA
  3. 3.Southwest Fisheries Center, National Marine Fisheries ServiceNational Oceanic and Atmospheric AdministrationLa JollaUSA

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