Website and domain for sale:

On how fish perceive the direction and strength of current of water?

Lateral line that is in the skin, under the scales (if scales are available).\r\n\r\PU different fish it differently located. Someone, as the name suggests - in the form of a narrow strip along the body, someone in the form of a network throughout the body (e.g., lamprey).\r\n\r\PU most fish, it is clearly expressed and well marked.
Answer add

Other questions in the section - animals_and_plants