A large group of yellowfin tuna swimming off the coast of Italy. Like all fish, they sleep, but it's not like human sleep. Giordano Cipriani/The Image Bank via Getty Images From the goldfish in your ...

Owning a colorful aquarium with beautiful fishes is not as complicated as people think. Small freshwater fish are becoming ...

New research from the University of Florida found that native fish are winning the battle against other invasive aquatic species. Scientists say that’s good for the state’s ecosystems. The study, led ...

Guppies can be fooled by optical illusions into believing objects are smaller or larger than they really are. This suggests they might not always make the best choices in their natural environment.

Breakthroughs, discoveries, and DIY tips sent every weekday. Terms of Service and Privacy Policy. For guppies (Poecilia reticulata) getting ready to mate, the color ...

Michael Heithaus does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...