The first fish evolved about 50 million years ago.

Name: The first fish evolved about 50 million years ago.
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Fish evolved approximately 500 million years ago. They had no jaws, but they possessed the chordate body plan. Fish have evolved into many varieties to suit the endless niches and environments they occupy. Information can be found in the section Fishes Are Earth's Most Abundant and Successful Vertebrates.

The First Fish Evolved About 50 Million Years Ago