Cleaner wrasse have revealed a remarkable new side of fish intelligence. Marked with fake parasites, they used mirrors to ...

Learn how cleaner wrasse used a mirror and even dropped food to test their reflections, a behavior linked mostly to mammals.

SACRAMENTO, Calif. (AP) — State fish and wildlife officials are studying a new way of transporting hatchery salmon that are intended to repopulate the Sacramento River system, a newspaper reported.

Research published in the Journal of Experimental Biology has shown that flying fish are every bit as good at gliding as birds. The fish are able glide for more than 40 seconds, covering distances of ...