Field studies of hearing in two species of flatfish Pleuronectes Platessa (L.) and Limanda limanda (L.) (family Pleuronectidae)

Pay-walled Peer Reviewed Publication 1974

Computational Biochemistry Physiology

1. Field measurements of hearing in Pleuronectes platessa and Limanda limanda show that they are sensitive to sounds in the frequency range from 30 to 250 Hz with greatest sensitivity around 110–160 Hz. 2. Both species were sensitive to particle motion. The thresholds in terms of displacement amplitude were 4 × 10-9 cm at the most sensitive frequencies. Above and below this range there was a sharp decline in sensitivity; the thresholds at 40 and 250 Hz were about 5 × 10-8 cm. 3. The sound pressure thresholds decreased by several decibels in the presence of an air-filled balloon, simulating a swimbladder. 4. The mechanism of hearing is discussed and it is suggested that the otolith organs in the labyrinth are the acoustic receptors. 5. Comparison between hearing data for flatfish and for the cod, Gadus morhua, suggests that differences in performance may be attributed to the accessory role of the swimbladder in the hearing of cod.

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