These receptors are used to detect changes in water pressure and may be used to locate prey and aid movement. Some fish can see into the infrared wavelength of the electromagnetic spectrum. Has 3 or 4 pairs of whiskers, called barbels , to find food. The catfish also has approximately 100,000 taste buds. Perhaps they need this high density of photoreceptors to detect the dim biolumninescence that exists in the ocean depths.
Collects underwater sound vibrations with an air bladder.
Hair cells in the inner ear respond to the vibration and transmit sound information to the fish brain. Can see in air and water simultaneously. Each eye is divided by flaps, so there is one opening in the air and one in the water. Fly Each eye has 3,000 lenses. Speed it up and you see a constantly moving image.