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Detection of movement by fish

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Why would it be important to detect water movement and vibrations?

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Rheotaxis is a form of an innate behavioral response by an organism to a directional stimulus or a gradient of stimulus intensity. Rheotaxis is seen in fish, where they will turn to face into an oncoming current (positive rheotaxis). The opposite of that is negative rheotaxis, where a fish orients itself away from a current or oscillations in water. Negative rheotaxis can be seen in salmon that migrate downstream.

Detection of water movement and vibration ...

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