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Below is a diagram of the anatomy of a typical fish. Fish anatomy is primarily governed by the physical characteristics of water, which is much denser than air, holds a relatively small amount of dissolved oxygen, and absorbs light more than air does.
The anatomy of fish is often shaped by the physical characteristics of water, the medium in which fish live. Water is much denser than fish, holds a relatively small amount of dissolved oxygen, and absorbs more light than air does.
Use your knowledge about fish anatomy to describe and draw a fish using proper terminology.
The many forms and shapes of the fish that fill up the waters of our world are not only beautiful, but practically evolved to suit a wide range of different life styles. You can find detailed information about all the different parts of basic fish anatomy by following the links on the menu below.
Explore the diagram below to learn the names of fish parts and find out what each one does, or use it as a reference as needed. We couldn't include all the features of every kind of fish, so we started by showing three different types - a shark, spiny-rayed fish and soft-rayed fish.
Fish are cold-blooded animals, which means that in most cases, their body temperature can change to mirror the temperature of the water they live in. A Fish’s anatomy can be divided into external and internal. Let’s start by examining the external anatomy of a fish.
Parts of a fish - internal anatomy of anterior region. Some of the internal anatomical features of a Largemouth Bass, Micropterus salmoides. The image is from Lagler, Bardach & Miller (1964) - (Source: Lagler, 1954). Image: Mark McGrouther© Australian Museum.