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.

Watching aquarium creatures is one of the best ways to reduce stress, but some owners crave actual interaction with their ...

"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.

Angelfish can become somewhat territorial during breeding, but with the right tank environment, they make a stunning and peaceful focal point. Rarely talked about but visually unforgettable ...

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 ...