Perhaps more than any other factor, it is the spectacular coloration and constant activity of many marine fish that beckons people to establish marine aquariums. Those who stay with the hobby for any length of time often discover that the fascination derived from observing the behavior of their pets outweighs the initial awe aroused by their beauty. In the following section, you will meet some of the more colorful and highly desirable species of fish that are commonly kept in marine aquariums and learn the pleasures and pitfalls of keeping them.