Learning about how the toothy gar fish regenerates its fins and the genes that drive regrowth could shed light on whether the same is possible in people.

Male lampreys attract females with a special pheromone called spermine, an odorous compound found in semen, researchers report.

Salmon in Alaska's Bristol Bay are heading to the ocean a whole year earlier than they used to because of climate change and other fish.

"These fish are like candy. They are tiny, colorful bundles of energy that get eaten...by any coral reef organism that can bite, grab, or slurp them up."

Invasive species are typically harmful, but they're an "evolutionary rescue" for the Gulf killifish.

A bunch of pregnant giant devil rays in fishing nets indicate a previously unknown birthing zone in the Gulf of California.

Bumphead parrotfish poop helps clarify the relationship between the fish and the reefs they call home.

Sunken human-made structures may make great artificial reefs for fish that climate change has dislocated.

The new 3D-imaging technology is so precise that it let scientists track catfish movements with errors equivalent to the width of a human hair.

A new map that tracks where sharks, tuna, and ships fight for space in the Pacific Ocean could help identify places where vulnerable species may be at risk.