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J Comp Physiol A Neuroethol Sens Neural Behav Physiol. 2002 Aug;188(7):553-60. Epub 2002 Aug 8.

The sensory basis of olfactory search behavior in banded kokopu ( Galaxias fasciatus).

Author information

1
National Institute of Water and Atmospheric Research, P.O. Box 11 115, Hamilton, New Zealand. c.baker@niwa.co.nz

Abstract

The sensory basis of olfactory search behavior was investigated in the banded kokopu, Galaxias fasciatus, using a flow tank. In the presence of a 2 cm s(-1) current flow, banded kokopu use both water current and chemical information to locate a food odor source. The superficial neuromasts of the lateral line system mediate the rheotactic component of the odor search. A physical block of one olfactory nostril did not affect the olfactory search strategy employed by banded kokopu in still water or in the presence of a current flow. Thus, there is no evidence that banded kokopu perform a bilateral comparison of the olfactory stimulus during their odor search. Previously, olfaction and gustation have been the only sensory systems shown to directly mediate orientation and movement towards odor sources in fish. The use of hydrodynamic cues by fish in location of an olfactory source has been previously proposed, but without direct experimental identification of the sensory systems employed. This study identifies the contributing roles of both olfactory and hydrodynamic sensory systems to the olfactory search repertoire of fish.

PMID:
12209343
DOI:
10.1007/s00359-002-0329-3
[Indexed for MEDLINE]

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