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The Nonindigenous Occurrences section of the NAS species profiles has a new structure. The section is now dynamically updated from the NAS database to ensure that it contains the most current and accurate information. Occurrences are summarized in Table 1, alphabetically by state, with years of earliest and most recent observations, and the tally and names of drainages where the species was observed. The table contains hyperlinks to collections tables of specimens based on the states, years, and drainages selected. References to specimens that were not obtained through sighting reports and personal communications are found through the hyperlink in the Table 1 caption or through the individual specimens linked in the collections tables.




Dascyllus trimaculatus
Dascyllus trimaculatus
(three spot damselfish)
Fishes
Exotic
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Dascyllus trimaculatus (Rüppell, 1829)

Common name: three spot damselfish

Synonyms and Other Names: domino damselfish, threespot damsel

Taxonomy: available through www.itis.govITIS logo

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).

US auto-generated map Legend USGS Logo
Alaska auto-generated map
Alaska
Hawaii auto-generated map
Hawaii
Caribbean auto-generated map
Puerto Rico &
Virgin Islands
Guam auto-generated map
Guam Saipan
Hydrologic Unit Codes (HUCs) Explained
Interactive maps: Point Distribution Maps

Nonindigenous Occurrences: 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.

StateYear of earliest observationYear of last observationTotal HUCs with observations†HUCs with observations†
Florida200620061Floridian

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.

Other Resources:
FishBase Summary

Author: Morris, James A., Jr., and Pamela J. Schofield

Revision Date: 4/20/2018

Peer Review Date: 4/1/2016

Citation Information:
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: 2/20/2019

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.

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Page Contact Information: Matthew Neilson - NAS Program (mneilson@usgs.gov)
Page Last Modified: Wednesday, October 10, 2018

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The data represented on this site vary in accuracy, scale, completeness, extent of coverage and origin. It is the user's responsibility to use these data consistent with their intended purpose and within stated limitations. We highly recommend reviewing metadata files prior to interpreting these data.

Citation information: U.S. Geological Survey. [2019]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [2/20/2019].

Contact us if you are using data from this site for a publication to make sure the data are being used appropriately and for potential co-authorship if warranted. For queries involving fish, please contact Matthew Neilson. For queries involving invertebrates, contact Amy Benson.