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 ...

We tend to credit animals like cats and dogs with a certain degree of mental complexity. But fish aren't usually afforded that kind of praise. "They do not talk, they do not bark," says Caio Maximino, ...

Fish often avoid intense stimuli, but scientists and animal welfare groups have long debated whether fish can feel pain. So is there an answer? Animal rights organization PETA claims on its website ...

But what do fish feel with barometric-pressure changes, and how are those feelings manifested in behavior? That's the million-dollar question, and one for which there is no clear answer. Among serious ...