Angelfish Behavioral Characteristics Angelfish are known to be territorial and aggressive when their living conditions are too cramped. They also tend to become aggressive when mating.

"The angelfish's appeal has to do with its spectacular finnage," says Steve Rybicki of Angels Plus in Olean, N.Y., who has been breeding these South American charmers for three decades.

The fish, which would later be identified as a blue angelfish, gravitated towards Danielle Orcutt, his wife’s hands, presumably to keep warm. Since colder waters were approaching, Silva and ...

Colorful angelfish — beauties of coral reef habitats — have capitalized on a remarkable set of jaws to exploit niches inaccessible to other reef denizens, according to new research. Fish that ...