Summary
The locomotor orientation of eleven goldfish, 20–25 cm long, was monitored during periods varying between 24 hours and 8 1/2 days, to verify the response to a depolarized and polarized “sky”, 100 cm in diameter, and to abrupt 90 ° degree rotation of thee-vector. The monitor consisted of a cylindrical tank with 16 peripheral compartments (Fig. 1) to which the fish had free access. Entry into and exit from each compartment was electronically recorded. The distribution of entries, which had no cyclical relationship with the compartments in depolarized light, became significantly symmetrical and bimodal in polarized light with the “preferred” compartments oriented parallel with thee-vector. Abrupt 90 ° rotation of the vector counter clockwise maintained this relationship during the entire duration of the recordings (up to 17 hours) (Fig. 2). The mean of the orientation angles of the fish on leaving compartments aligned with thee-vector were significantly higher than those from the remaining compartments (Fig. 3). This behavior tended to keep the locomotor orientation parallel with thee-vector as the fish moved between compartments. A strong cyclical relationship between these orientation angles and the compartments of origin was present in polarized but absent in depolarized light. Counter clockwise 90 ° rotation of thee-vector maintained the cyclic behavior of angles but the relationship between the larger means and thee-vector shifted over one or two compartments. This shift disappeared in clockwise rotation. This phenomenon may be due to one of these directions being “unnatural”. The results demonstrate a pronounced sensitivity and response toe-vector orientation in the goldfish. The sensory mechanism remains unknown.
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The authors are greatly indebted to Dr. T. H. Waterman for a critical review and discussion of the results here presented.
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Kleerekoper, H., Matis, J.H., Timms, A.M. et al. Locomotor response of the goldfish to polarized light and itse-vector. J. Comp. Physiol. 86, 27–36 (1973). https://doi.org/10.1007/BF00694475
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DOI: https://doi.org/10.1007/BF00694475