The salmon’s life cycle inspires more awe and reverence than most species in the animal kingdom, but on farms, they’re reduced to swimming in tiny circles for years and subsisting on small, manmade ...

Fish species living in the deep sea feature a surprisingly large range of body shapes that evolved in different ways and at ...

Stingrays give birth to live babies, but they aren't mammals. Learn all about these fascinating fish that live in oceans and ...

A sleepy koala may seem worlds apart from a giant Ice Age predator, but scientists have uncovered the first molecular ...

Sleep in fish may look different from humans, but rest is essential for survival. Here’s what experts have to say about fish sleep. A protective mucous cocoon surrounds this parrotfish as it sleeps in ...

An international investigation uncovers how criminal networks traffick parts of the totoaba, an endangered fish caught in ...

Scientists have captured rare footage of remoras, also known as sucker fish, hitching rides on humpback whales off the coast of Australia.

Some “clicks” made by sperm whales may actually be “clacks,” but marine biologists debate what, if anything, that means.