This species, with its many varieties ... watch out for infection and diseases such as fin rot, dropsy, and swim bladder disease. While Betta fish can tolerate dirty water for a short period ...

There are at least 40 known species of flying fish. Beyond their useful pectoral fins, all have unevenly forked tails, with the lower lobe longer than the upper lobe. Many species have enlarged ...

Its teeth are designed not so much to grab or slice fish but to prevent them from escaping ... brain has clearly done nothing to hinder the species' long-term survival. Previously known only ...

Researchers in the Amazon of Colombia made a mysterious discovery when taking a closer look at a fish collected from a forest ...

with three spines on its anal fin, according to the study. The fish has a “large” mouth and there are “simple, sharp” and “conical” spines near the nasal, researchers said. “The species name ...

DESCRIPTION: The desert pupfish is a small, silver-colored fish with dark vertical bars on its sides. It has a short, compressed head, an upturned mouth, a thick, chubby body, and rounded fins ...

Usually growing from 3.5 to 4.3 inches as adults, these medium-sized fish are translucent silver on their sides and olive to iridescent pink on their back. Their most distinctive characteristic is ...

Seahorse species belong to the genus called Hippocampus ... of being picked off by predators such as crustaceans and larger fish. These upright fish have a dorsal fin that flutters 30 to 70 times per ...

Thousands of new species are found each year ... Spines hold the dorsal fin up from the fish’s back, starting with longer spines and going to shorter spines toward the tail, with three spines ...