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It has previously been shown that at least one species of fish (the American shad) in the order clupeiforms (herrings, shads, and relatives) is able to detect sounds up to 180 kHz. However, it has not been clear whether other members of this order are also able to detect ultrasound. It is now demonstrated, using auditory brainstem response (ABR), that at(More)
Thresholds for diffuse, broad-band illumination were obtained for the goldfish (Carassius auratus) by avoidance conditioning. The light source was a television cathode-ray tube whose output was controlled over a range of 140 dB by a combination of 'brightness' control, blanking of scan lines, and neutral density filters. The threshold was calculated in(More)
1. Investigations were conducted on hearing capabilities and the structure of the inner ear in the marine catfish,Arius felis. 2. The gross morphology and ultrastructure of the saccule and lagena are similar to that found in other Ostariophysi. In contrast, the utricle inArius is very large and has a large otolith. The utricular sensory epithelium forms a(More)
The marine catfish (Arius felis) uses directional hearing for the acoustical detection of obstacles, and is primarily dependent on the vector components of near-field acoustics. Directional sound, detected as lateral line action potentials, produces the strongest response on the side toward the stimulus. Responses are maximal in the 50-150 Hz range. The(More)