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Why do fish need strong muscles in its tail fin?

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To swim.
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Will beta fish grow their tail fins if broken off?

Their fins will grow back into their first luscious state after a period of 8 months. It may take longer if they are not kept in good condition (clean tank water ((change ever

What does the tail fin of a fish do?

The tail fin acts as a rudder on a ship would.  Turning the fish in whichever direction it wants to go in.

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 degr

What is the tail fin of a fish called?

The caudal fin is the tail fin, located at the end of the caudal peduncle and is used for propulsion

Do fish have fins?

Answer   Most fish do. I would say that all fish do, but it seems on Earth there is always an exception because there are so many different types of fish in the world.

How do you grow a mermaid fin tail?

You can't, since mermaids don't actually exist and if they did there still wouldn't be a way for you to turn into one any more than you can turn into a dog or a hamster.