Why do fish need strong muscles in its tail fin?

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To swim.
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Why do fish need fins?

Fish use their fins for propulsion (to push them along in the water) and like boat rudders to guide their movement. Also, many fins are bony and sharp and provide a degree of

Do cod fish have tail fins?

There are several species of fish that are commonly called "cod". They all have a caudal (tail) fin.
In Fish

Why do fish have tail fins?

They have tail fins to propel themselves in water. It can also aid in steering the fish in one direction.