Damselfish

Damselfish are small marine fish in the family Pomacentridae, common on tropical reefs and known for vivid coloration and territorial behavior.

Territoriality: Behavior in which an animal defends an area against rivals, often to secure food, shelter, or mates. Damselfish often defend feeding patches and shelter from other fish.
Pomacentridae: A family of marine fishes that includes damselfishes and clownfishes. Damselfish are members of this family, whose species vary in diet and habitat.
Reef restoration: Interventions intended to help damaged coral reef ecosystems recover. Damselfish influence algae and habitat conditions that affect restored corals.
Three-spot dascyllus: A small Indo-Pacific damselfish, Dascyllus trimaculatus, marked by three conspicuous pale spots when young. Its changing markings illustrate how damselfish appearance can vary with age.
Algal farming: The cultivation and defense of algae by animals that use it as food. Some damselfish weed and defend algae patches as cultivated food gardens.
Perciformes: A large traditional grouping of ray-finned fishes, including many familiar marine families. Damselfish have historically been placed among perch-like fishes in this broad grouping.
Marine aquarium: An aquarium designed to house saltwater organisms. Hardiness and bright colors make several damselfish popular aquarium species.
Stegastes nigricans: A Pacific damselfish that maintains territories containing cultivated algae. Its algal gardens are a well-studied example of farming behavior on reefs.
Herbivory: An animal feeding primarily on plants or algae. Algae-eating damselfish crop reef growth and influence which algae persist.
Coral reef: A marine ecosystem built largely by reef-forming corals and their calcium-carbonate structures. Reef structure provides damselfish with feeding grounds, shelter, and nesting sites.

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ParrotfishCompared with: Some damselfish cultivate algae in defended patches rather than ranging over reef surfaces.