Can fish hear? How can they detect danger other than by sight?
All fish can probably hear sounds produced in the water. Fish can also hear sounds made on shore or above the water if they are loud enough. Catfish and certain other fish have a keen sense of hearing. Fish have an inner ear enclosed in a chamber on each side of the head. Each ear consists of a group of pouches and tubelike canals. Fish have no outer ears or eardrums to receive sound vibrations. Sound vibrations are carried to the inner ears by the body tissues.
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Yes fish can here sounds in the water. These sounds tell the fish how safe or unsafe it is to go that way.
I would like to add to GabeCohens very good answer that fish are also able to detect shock waves in the water like from a rock thrown in to the water or from quick movements close to them, I can't give you the scientific explanation for that but fish have a line along their bodies from head to tail, this line has nerve endings that detect those waves, you can see this line very good on a Pike.
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