As one of the world’s most diverse vertebrates, fish can come in a variety of shapes, colors, and sizes. With over 33,000 species inhabiting the Earth’s aquatic habitats, some are bound to be a bit on ...

A new small blue snailfish is changing our understanding of the world's deepest fishes. A new small blue snailfish is changing our understanding of the world's deepest fishes. In 2018, an ...

The fish was found at 200 to 2,000 meters below the surface. At least 16 types of recently discovered deep-sea fish are among the darkest creatures ever found, according to a study published Thursday.

Learn more about the juvenile fish that carry sea anemones like weapons or shields to ward off predators.

A new species of Polynesian clownfish was discovered and named Amphiprion maohiensis, thanks to a detailed DNA study.

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Marine researchers ...

Rising human exploitation of the oceans is pushing ever further into regions that scientists increasingly suspect are full of conscious life. New research into creatures from sperm whales to octopuses ...

SAN DIEGO (KSWB/KUSI) — Researchers say they have discovered a new species of tropical fish during an expedition to remote islands off the Pacific coast of Mexico. Named the Halichoeres sanchezi, or ...