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Journal of Experimental Biology 171,163-172 (1992)
Published by Company of Biologists 1992

The Inner Ear is Responsible for Detection of Infrasound in the Perch (Perca Fluviatilis)

HANSERIK KARLSEN ¹

¹ Institute of Biology, University of Oslo 0316 Oslo, Norway

In a previous study of infrasound detection in the cod, the inner ear was suggested to be the sensory organ responsible for the responses. However, a possible involvement of the lateral-line system in the observed low-frequency detection could not be ruled out. The infrasound sensitivity was therefore studied in perch (Perca fluviatilis) with normal and blocked lateral-line organs. The experiments were performed using a standing wave acoustic tube and the cardiac conditioning technique. All perch readily responded to infrasound frequencies down to 0.3 Hz with threshold values of approximately 2x10^-4 ms^-2. These thresholds were not affected by complete blocking of the lateral-line system with Co²⁺, which suggests that the inner ear is responsible for the observed infrasound detection by the perch.

Key words: infrasound, hearing, fish, cobalt, Perca fluviatilis

Accepted on June 22, 1992

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