Common name: three spot damselfish
Synonyms and Other Names: domino damselfish, threespot damsel
available through www.itis.gov
Identification: The body is the color of charcoal with black scale margins. Orangish-brown head and breast. Some specimens have yellow on the caudal, anal, and pelvic fins. Juveniles have two distinctive white spots; one on the head above the eyes and one positioned dorso-laterally. Dorsal fin XII (14-16), anal fin II (14-15). Pectoral rays 19-21. From Randall et al. (1996).
Similar species: Sunshinefish (Chromis insolata) has yellow, pale or clear rear dorsal and caudal fins.
Size: 13 cm TL
Native Range: East Africa and the Red Sea to the Line Islands and Pitcairn Group; southern Japan to New South Wales and Lord Howe Island. From Randall et al. (1996) and Randall (2005).
Hydrologic Unit Codes (HUCs) Explained
Puerto Rico &
Interactive maps: Point Distribution Maps
In Florida, one individual was observed off Boca Raton in 2006 (REEF 2008).
Table 1. States with nonindigenous occurrences, the earliest and latest observations in each state, and the tally and names of HUCs with observations†. Names and dates are hyperlinked to their relevant specimen records. The list of references for all nonindigenous occurrences of Dascyllus trimaculatus are found here.
Table last updated 10/23/2018
† Populations may not be currently present.
Ecology: Juveniles are sometimes found with sea anemones or venomous long-spined sea urchins in their native habitat. The species can be found on coral reefs and rocky substrata from depths of one to 55 m. From Randall (2005) and Randall et al. (1996).
Means of Introduction: Probable aquarium release.
Status: Reported from Florida.
Impact of Introduction: The impacts of this species are currently unknown, as no studies have been done to determine how it has affected ecosystems in the invaded range. The absence of data does not equate to lack of effects. It does, however, mean that research is required to evaluate effects before conclusions can be made.
References: (click for full references)
Randall, J. E. 2005. Reef and Shore Fishes of the South Pacific. New Caledonia to Tahiti and the Pitcairn Islands. University of Hawai’i Press, Honolulu.
Randall, J. E., G. R. Allen and R. C. Steene. 1996. Fishes of the Great Barrier Reef and Coral Sea. Second Edition. University of Hawaii Press, Honolulu, Hawaii.
Reef Environmental Education Foundation (REEF). 2008. Exotic species sighting program and volunteer database. World wide web electronic publication. www.reef.org, date of download March 10, 2008.
Morris, James A., Jr., and Pamela J. Schofield
Revision Date: 4/20/2018
Peer Review Date: 4/1/2016
Morris, James A., Jr., and Pamela J. Schofield, 2019, Dascyllus trimaculatus (Rüppell, 1829): U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?speciesID=2763, Revision Date: 4/20/2018, Peer Review Date: 4/1/2016, Access Date: 4/23/2019
This information is preliminary or provisional and is subject to revision. It is being provided to meet the need for timely best science. The information has not received final approval by the U.S. Geological Survey (USGS) and is provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the information.