Green Brittle Star
Likely Reef Tank Suitable
Likely Fish-Only Tank Suitable
Range: Indo-West Pacific Ocean: Sri Lanka to Hawaii.
Size: 22 inches (55 cm)
Natural Environment: Inhabits reef areas and generally found in crevices and under rocks.
General Husbandry: Occasionally seen in the trade.
Best maintained in aquaria with live rock caves where it can hide during daylight hours and since this is a scavenger, its best not placed in new systems.
During evening hours will search the substrates for organic matter.
A valuable member of a cleanup crew, as it will forge for uneaten foods. Nevertheless, to be sure its getting the nutrition needed, placing several shrimp pellets in dark corners of the aquarium in early evening hours a couple of times monthly may help lengthen its lifespan.
FYI: Has short yellow and black bristles along green arms. A commonly kept brittle star, however, a possible fish and shrimp eater.
Sudden changes in salinity may have a drastic result, therefore acclimate as noted below.
Experience Level: Intermediate
Aquarium Environment: Reef or fish-only aquarium
Coral Safe: Yes
Fish Safe: Yes
Invertebrate Safe: Yes
Acclimation Time: Sensitive to specific gravity/salinity changes, therefore be sure to adjust the bag's water to that of the aquarium in which it will be placed by slowly adding small amounts of aquarium water to the bag every few minutes. In most cases, this process should take at least 15 minutes.
Aquarium Hardiness: Moderate
Temperature Range: 72 - 82°F (22 - 28°C)
Minimum Tank Size: 100 gallons
Specific Gravity: 1.023 - 1.025
pH: 8.0 - 8.4
Ophiarachna affinisOphioderma appressum
Return to Linking Page
Photo © Bob Goemans
Classification / Names Common names | Synonyms | CoL | ITIS | WoRMSOphiuroidea | Ophiurida | Ophiodermatidae
Environment / Climate / Range EcologyReef-associated; depth range 1 - 20 m (Ref. 102355). Tropical
Distribution Countries | FAO areas | Ecosystems | Occurrences | IntroductionsIndo-West Pacific: East Africa to New Guinea and the Philippines.
Length at first maturity / Size / Weight / Age Maturity: Lm ?  range ? - ? cm Max length : 5.5 cm WD male/unsexed; (Ref. 87041)
Size refers to disc diameter (Ref. 87041). Occurs on shallow reef flats under coral rubble, in seagrass beds and among algae. Feeds on small invertebrates (Ref. 800). Members of the class Ophiuroidea are mostly gonochoric, others are protandric. Fertilization is external. Brooding is common, bursae is used as brood chambers where the embryos develop into juveniles and later crawl out from the bursal slits. Life cycle: Embryos hatch into free-swimming planktotrophic larvae and later metamorphose into tiny brittle stars which sink down the bottom where they grow into adult form (Ref. 833).
Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Members of the class Ophiuroidea are mostly gonochoric, others are protandric. Fertilization is external. Brooding is common, bursae is used as brood chambers where the embryos develop into juveniles and later crawl out from the bursal slits. Life cycle: Embryos hatch into free-swimming planktotrophic larvae and later metamorphose into tiny brittle stars which sink down the bottom where they grow into adult form.
Main reference References | Coordinator | CollaboratorsSchoppe, S. 2000. (Ref. 800)
IUCN Red List Status (Ref. 115185)
CITES status (Ref. 108899)
CMS (Ref. 116361)
Threat to humans
| FishSource |
Estimates of some properties based on models
Preferred temperature (Ref. 115969): 24.5 - 29.3, mean 28.3 (based on 2687 cells).
Vulnerability Low vulnerability (10 of 100)