Each of the numerous cold-blooded vertebrates lives in the water. Fish have gills for the production of oxygen, a lateral line for detecting pressure changes in the water, and a vertical tail. Most fish are covered with scales and have limbs in the form of fins. They can communicate through their use of acoustic communication. Acoustic communication in fish involves the transmission of acoustic signals from one individual to a species to another. The production of sounds is often used in the context of feeding. Fish are abundant in most bodies of water. They can be found in nearly all aquatic environments, from high mountain streams. A fish classification describes in various ways.

Classification of Fish:

Generally, we classify the fish on some basis like On The Basis of Habitation, On The Basis of Physical Shape, On the basis Of flesh type. Now discuss this one by one.

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