Look for them in red, yellow, or blue. They can also be a mix of colors making them extremely colorful; they are sometimes rainbow fish. The dragon mosaic guppies are some of the most colorful ...

But aside from just being known for versatility and tastiness, it's also known for something else: Its signature bright red color, which arguably makes it the most visually distinct fish and is part ...

Adult males also go through a color change during the mating season, researchers said. From the lower jaw to the back of the fish, it takes on a bright orange-red color, extending onto the fins.