These are the prettiest freshwater fish, from vibrant brook trout and pumpkinseed sunfish to majestic lake sturgeon. Check out how these species made our list!

Sea slugs use bold, bright colors under sunlight to warn predators of their toxic traits. These colors are easier for fish to ...

With shiny, multi-colored scales, Rainbow Fish is the most beautiful fish in all of the ocean, and the only one of their kind. When Rainbow Fish refuses to share their vibrant, shimmering scales ...