The distinctive bristlenose pleco is a favorite among fish enthusiasts – and it’s no wonder. They are visually stunning, ...

Koi aren't lightweights either; they typically tip the scales around 35 pounds (16 kg), and experts advise filling a pond ...

Other videos showed two species of cusk eel, Bassozetus sp. and Barathrites iris, swimming tail-first away from the camera with the help of top fins. “After the backward escape maneuver, the fish ...

The amount of sperm released decreased sharply with each mating during a single day, reducing the males' fertilization rate.

Japanese rice fish – also known as medaka ( Oryzias latipes) – are a small, unassuming species that live wild in the ...

In a river of southern Africa, a “large”-mouthed creature swam along the rocks looking for its next meal. Something about the “slender” animal caught the attention of snorkelers — and for good reason.