The fish can hear the sound. Although they do not appear to have ears, their ears are actually hidden in their heads. Unlike mammals, which have an outer, middle and inner ear, fish only have an inner ear, which is divided into two parts, the upper part, called the utricle, contains a small hole and three semicircular canals, which are its organs for sensory balance. The lower part is called the lenticular sac, and the convex part behind it is the ear pot.
1. Hearing: Since fish have ears, they certainly have hearing. However, compared with humans, their hearing range is very narrow. They can only feel sound waves that vibrate 340-690 times per second. However, some fish have special ear structure, slightly sensitive hearing, can hear high-frequency sound waves.
2. Vision: The vision of fish is not strong. They can only see things near clearly. This is because their eyeball structure is simple. They only have a small transparent ball. Moreover, they have no elasticity. The distance between the lens and the retina can only be adjusted by the mirror-like bulge behind the lens. Therefore, they can see things near clearly, but not things far away.
3. Smell: The nose of terrestrial animals can smell volatile odors, while fish live in water, and their sense of smell is completely different. There are often holes in the snout, where water flows in and out of the holes on both sides of the back, and the olfactory sacs inside can sense amino acids, so as to judge the water quality and the surrounding fish.
