A tiny fossil, Acronichthys maccognoi, rewrites fish evolution in North America and reveals how otophysans conquered freshwater habitats.

(CNN) — US Customs and Border Protection officers in Arizona have seized 242 pounds of swim bladders – the organ that helps fish control their buoyancy – that came from the endangered Totoaba fish, ...

NOGALES, AZ (3TV/CBS 5)-- A smuggling attempt ended with a fishy discovery at the Port of Nogales several months ago. On April 13, border patrol officers were working at the Mariposa trade facility ...

You walk past your fish tank and suddenly notice one of your fish floating strangely near the surface or maybe even upside down. Your heart skips a beat. Is it dead? But wait its gills are still ...

Customs officials in Arizona have conducted their second largest seizure to date of a haul of endangered fish organs, known colloquially as the "cocaine of the sea." Enforcement officers estimate that ...