The megalodon was an even more fearsome predator than previously thought, able to take down prey the size of modern orcas.

Research shows that coral reefs' diversity of fish results from a relatively recent innovation among bony fish: biting prey from surfaces.

Forming large groups while in the ocean protects Pacific salmon from predators, research finds. It can also limit how much they eat.

Hanging out with other guppies can offer protection against predators, but all that social mingling can set them up for breeding deadly parasites.

A new study finds a connection between eating fish and developing skin cancer. Researchers say bio-contaminants like mercury are a likely cause.

Guppies and mosquitofish can turn to cannibalism in your fish tank, but it's rare to find them eating their other members of their own species in the wild.

A new study that clarifies how electric fish evolved electric organs could help pinpoint genetic mutations behind some human diseases.

Scientists have idetified six strategies to implement and two to avoid when tackling a lionfish invasion.

"Expansion of sustainable ocean aquaculture could build on fisheries reforms to increase the availability of healthy and sustainable seafood to our growing population."

Researchers are using environmental DNA left behind by fish to figure out which species live secretive lives in coral reefs.