In many fish species, water temperature determines the sex of the fry. This biological mechanism threatens to wipe out entire ...

Casting along a drop-off on the St. Croix River, I felt some sharp tugs. I thought this might be rocks or clams. But then the ...

The hybrid freshwater fish actually reproduces exclusively female clones, doing so for much longer than scientists thought ...

Together with a European team, researchers from Senckenberg am Meer in Wilhelmshaven have described a new fish species. Gaidropsarus mauritanicus is only about 73 millimeters long and lives in the ...

There’s something oddly calming about watching fish move through water. No notifications, no noise, no rush – just a small world inside glass, carrying on quietly. Maybe that’s why freshwater ...

Habitat loss and water pollution in the early 1900s decimated their numbers, but they have been slowly recovering.

Bichir, pronounced “be-sheer,” are considered living fossil fish. Also known as “dinosaur eels,” these fish have many unique features. Read on to learn everything you need to know about what makes ...

Darwin’s old puzzle starts with a simple question: when a species enters a new habitat, does it do better by fitting in or by ...

To survive in the frigid ocean waters around the Arctic and Antarctica, marine life evolved many defenses against the lethal cold. One common adaptation is the ability to make antifreezing proteins ...