What about the new koi lying in the tank? the physiological structure and planing of the koi-- lateral lines and muscles.

Lateral line

All fish have a sensory organ called the lateral line. A series of fish scales with pores or micropores arranged along the sides of the fish and look like a row of dots. These holes open in a tubule under the scale, which runs along both sides of the fish. Inside the tubule, there are many hair cells connected to nerve fibers, which transmit the stimulus to the notochord and then to the brain.

Any movement of the liquid in the lateral tubule stimulates the hair cells, making the koi feel the vibration in the water. The vibration may come from the reflection of other fish, or from obstacles, or even by the sound of human footsteps.

Muscle.

There are three basic forms of muscle in all vertebrates: smooth muscle, mostly distributed on the walls of arteries and large veins, and on the walls of the intestines responsible for food movement: the myocardium and striated muscles, which are related to exercise and are attached to the bone through tendons. In fish, this muscle forms a series of WM-shaped muscle blocks, called lateral muscles, that surround the fish and generate thrust during movement.

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