Alien fish are already strange, but watching one face off against a live blue crawfish was next level. The clash of colors ...

Somewhere in the ocean's depths swims a small fish with a see-through skull, tubular eyes, and visual tricks that break every rule biology textbooks lay down about how vertebrates see.

A searobin 'walks' on the seafloor, using modified fin-ray appendages. (NOAA Office of Ocean Exploration and Research) The ...

A striking, silver-colored fish commonly kept as an aquarium pet has been hiding in plain sight in the Philippines' largest freshwater lake, renewing concerns over the unmonitored and unmitigated ...

A 7-foot-long ocean sunfish was recently discovered on an Oregon beach, attracting the attention of local aquatic experts. The fish, which is also known as a Mola mola, recently washed ashore at Hug ...

Biologists from the Ateneo de Manila University in the Philippines have confirmed the presence of the tinfoil barb (Barbonymus schwanefeldii), a popular aquarium fish, in Laguna de Bay, the country's ...