Fish scale - Wikipedia

What is the reason that most fish are not flat? - Quora

How many types of fish tails are there and what are the reasons for the variation? - Quora

Where do fish live?, What do fish eat?

Fish scale - Wikiwand

FishBase Glossary

Do tuna have scales? - Quora

Why do some fish have teeth and others don't? - Quora

Fish anatomy - Wikipedia

Fish - Wikipedia

Fish scale - Wikiwand

New Species Of River Dolphin Discovered, First In Nearly A Century - The Dodo