Yellowtail Damsel (Chrysiptera parasema) saltwater aquarium fish portrait

Chrysiptera parasema is a compact, laterally compressed damselfish dressed in vivid electric blue across the head and body, with the color ending abruptly at the rear flanks to give way to a clean yellow caudal peduncle and tail. That sharp break is the easiest way to separate it from other blue-and-yellow Chrysiptera, several of which carry yellow forward onto the belly. Adults reach roughly 3 inches, and the species ranges through the Western Pacific, where it occupies coral-rich sections of sheltered lagoons and inshore reefs at depths of about 1 to 16 meters, frequently among stands of Acropora.

A mature, fully cycled marine system of at least 30 gallons suits an adult, with larger quarters appropriate when housing a group or several territorial fish. Build the layout around substantial rockwork that provides numerous crevices and retreats, since this fish darts into cover when startled and often adopts a particular shelter as its own. Leave open water in front of the reef structure for cruising, keep water movement moderate, and maintain stable parameters. A secure lid is sensible husbandry for damselfishes in general, though no unusual jumping tendency has been documented for this species.

Wild individuals feed primarily on zooplankton drifting past the reef, taking copepods, mysids, shrimp larvae, and fish eggs, and they also graze algae. That mixed intake makes this an omnivore in the aquarium, and it is one of the more cooperative feeders among small reef fishes, taking prepared items almost immediately after introduction.

Offer a rotating menu of mysis shrimp, enriched brine shrimp, finely chopped marine meats, and well-made marine flakes or pellets, supplemented with preparations containing Spirulina or other vegetable matter. Feeding twice daily works well, and several smaller meals spread through the day suit this active, opportunistic grazer even better. Because it is bold and undiscriminating at the surface, watch that it does not intercept the share intended for shyer tankmates.

Mysis Shrimp Enriched Brine Shrimp Chopped Marine Meats Marine Flakes Marine Pellets Spirulina Preparations Vegetable-Based Foods
Active by day, this damselfish spends most of its time hovering in open water within a short dash of the rocks. In the wild it forms small groups around Acropora thickets, and that habit carries into the aquarium when space and cover are generous. It ranks among the less aggressive damselfishes, yet individuals will defend a favored crevice and may nip fish of similar size, which is why a semi-aggressive classification is the prudent assumption. Groups are workable in roomier systems, and members should be introduced together rather than added one at a time.

It mixes well with hardy or even-tempered community fishes provided the layout offers multiple retreats and enough swimming room to dilute territorial pressure; very passive or slow-moving tankmates deserve close observation during the first weeks. For corals, this species is reliably safe and fully suited to reef aquariums. Reports on mobile invertebrates differ, with some accounts stating it ignores them entirely and another advising general caution, so no specific predation risk to ornamental shrimp, crabs, snails, or clams has been established, and a watchful eye remains the sensible approach in a heavily stocked invertebrate display.

FAQ

Frequently Asked Questions

About the Yellowtail Damsel

  • Is the Yellowtail Damsel suitable for a reef aquarium?
    Yes, it is considered coral-safe and reef compatible. Accounts of its behavior toward mobile invertebrates vary, so a degree of caution is warranted in invertebrate-heavy displays.
  • What is the recommended minimum aquarium size?
    Plan on at least 30 gallons for a single adult. Provide additional volume when keeping a group or housing other territorial fishes.
  • Is it peaceful enough for a community tank?
    It is among the milder damselfishes and generally coexists with hardy or even-tempered community fish, though individuals can turn territorial and nip similar-sized tankmates. Supply several retreats and monitor very passive species.