In 2002 what, possibly unique, reaction was observed in cichlids, a freshwater fish species, in one short stretch of the River Congo?
What is the distinguishing characteristic of the Anabantoidei species of fish, known as gourames, one of which is the Siamese fighting fish?
What are the fish, commonly found at depths of 200 to 700 m (660 to 2,300 ft), from Tierra del Fuego to California, and nicknamed "red devil" by fishermen?
