A biologist at Washington University in St. Louis has shown that for some fish species, females prefer males with larger sexual organs, and actually choose them for mating. That does not exclude males ...

Evolution has so precisely honed certain specialized muscles involved in fish mating calls that the muscles are now physically incapable of much else, including any significant locomotion, biologists ...

"Each spring, all adults of the species migrate to one site, the Colorado River Delta in the uppermost portion of the Gulf [of California], to form one spawning aggregation of several million fish," ...

Residents of Tampa, Florida have reported hearing strange noises coming from the bay for years, and now scientists believe it may be fish mating — very loudly, according to reports. The deep, ...

Grunions are the only fish in the world that come out of the water and burrow into the sand to lay their eggs. Their complicated mating ritual can be watched along Southern California to Baja ...

If you live by the sea, have you ever heard an annoying humming that keeps you awake? Before you bang indignantly on your neighbors’ doors, consider that it might be horny fish making the noise. One ...

Anglerfish are one of the more well-known curiosities of the deep. They look incredibly odd compared to the fish we're used to seeing closer to the surface, and their glowing appendages are truly a ...

Pharmaceuticals and household chemicals in rivers and streams may be affecting how fish mate and spawn, scientists warn, even when the substances are not present at levels high enough to cause visible ...