About Stegastes diencaeus (Jordan & Rutter, 1897)
Stegastes diencaeus, commonly known as the longfin damselfish, is a member of the damselfish family Pomacentridae that is native to the Western Atlantic. This species occasionally enters the aquarium trade, and reaches a maximum length of 12.5 cm. Longfin damselfish are known to have a mutualistic relationship with the mysid shrimp species Mysidium integrum. This interaction is classified as a form of domestication: the shrimp supply nutrients to the algae farms that the fish rely on for food, while the fish protect the shrimp from predators.
