Trigger fish (Balistes capriscus)

Distribution data supplied by the Ocean Biodiversity Information System (OBIS). To interrogate UK data visit the NBN Atlas.Map Help

Summary

Description

The trigger fish Balistes capriscus is commonly known as the grey trigger fish. It is brownish green to grey in colour and reaches a maximum length of 40cm. The mouth is small and 'beak like' with fleshy lips. Body form is laterally flattened to allow manoeuvring in shallow rocky areas or wrecks that they inhabit. The first dorsal fin can be locked upright and then unlocked by depressing the second spine, the 'trigger'.

Recorded distribution in Britain and Ireland

Adult specimens have been recorded in increasing numbers around the western coasts of Britain and Ireland. There is no current evidence of a breeding population in Britain and Ireland.

Global distribution

-

Habitat

Mainly rocky bottoms and floating wreckage at depths between 10-100 m.

Depth range

-

Identifying features

  • Brownish green to grey in colour.
  • Up to 40 cm in length.
  • Small, beak-like mouth with fleshy lips.
  • Latitudinally flattened body.
  • First dorsal fin may be locked upright or flat.
  • Not currently in British waters.

Additional information

Common in the Mediterranean, where spawning occurs in water temperatures above 12°C. As they are poor swimmers, it is likely they arrive in the Eastern Atlantic to the North coast of Angola via the Gulf Stream. They may increase in numbers in Britain and Ireland because of warmer seas due to global warming.

Listed by

- none -

Further information sources

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Bibliography

  1. FishBase, 2000. FishBase. A global information system on fishes. [On-line] http://www.fishbase.org, 2001-05-03

  2. Howson, C.M. & Picton, B.E., 1997. The species directory of the marine fauna and flora of the British Isles and surrounding seas. Belfast: Ulster Museum. [Ulster Museum publication, no. 276.]

  3. JNCC (Joint Nature Conservation Committee), 1999. Marine Environment Resource Mapping And Information Database (MERMAID): Marine Nature Conservation Review Survey Database. [on-line] http://www.jncc.gov.uk/mermaid

  4. Picton, B.E. & Costello, M.J., 1998. BioMar biotope viewer: a guide to marine habitats, fauna and flora of Britain and Ireland. [CD-ROM] Environmental Sciences Unit, Trinity College, Dublin.

  5. Whitehead, P.J.P., Bauchot, M.-L., Hureau, J.-C., Nielson, J. & Tortonese, E. 1986. Fishes of the North-eastern Atlantic and the Mediterranean. Vol. I, II & III. Paris: United Nations Educational, Scientific and Cultural Organisation (UNESCO).

Datasets

  1. Cofnod – North Wales Environmental Information Service, 2018. Miscellaneous records held on the Cofnod database. Occurrence dataset: https://doi.org/10.15468/hcgqsi accessed via GBIF.org on 2018-09-25.

  2. Fenwick, 2018. Aphotomarine. Occurrence dataset http://www.aphotomarine.com/index.html Accessed via NBNAtlas.org on 2018-10-01

  3. Isle of Wight Local Records Centre, 2017. IOW Natural History & Archaeological Society Marine Records. Occurrence dataset: https://doi.org/10.15468/7axhcw accessed via GBIF.org on 2018-09-27.

  4. Kent & Medway Biological Records Centre, 2017. Fish: Records for Kent. Occurrence dataset https://doi.org/10.15468/kd1utk accessed via GBIF.org on 2018-09-27.

  5. Manx Biological Recording Partnership, 2017. Isle of Man wildlife records from 01/01/2000 to 13/02/2017. Occurrence dataset: https://doi.org/10.15468/mopwow accessed via GBIF.org on 2018-10-01.

  6. Manx Biological Recording Partnership, 2018. Isle of Man historical wildlife records 1995 to 1999. Occurrence dataset: https://doi.org/10.15468/lo2tge accessed via GBIF.org on 2018-10-01.

  7. Nature Locator, 2017. Sealife Tracker. Occurrence dataset: https://doi.org/10.15468/qgk3pg accessed via GBIF.org on 2018-10-01.

  8. NBN (National Biodiversity Network) Atlas. Available from: https://www.nbnatlas.org.

  9. Norfolk Biodiversity Information Service, 2017. NBIS Records to December 2016. Occurrence dataset: https://doi.org/10.15468/jca5lo accessed via GBIF.org on 2018-10-01.

  10. OBIS (Ocean Biodiversity Information System),  2025. Global map of species distribution using gridded data. Available from: Ocean Biogeographic Information System. www.iobis.org. Accessed: 2025-05-23

  11. Outer Hebrides Biological Recording, 2018. Vertebrates (except birds, INNS and restricted records), Outer Hebrides. Occurrence dataset: https://doi.org/10.15468/dax3tf accessed via GBIF.org on 2018-10-01.

  12. South East Wales Biodiversity Records Centre, 2018. SEWBReC Fish (South East Wales). Occurrence dataset: https://doi.org/10.15468/htsfiy accessed via GBIF.org on 2018-10-02.

  13. South East Wales Biodiversity Records Centre, 2018. Dr Mary Gillham Archive Project. Occurance dataset: http://www.sewbrec.org.uk/ accessed via NBNAtlas.org on 2018-10-02

Citation

This review can be cited as:

Reeds, K.A. 2008. Balistes capriscus Trigger fish. In Tyler-Walters H. and Hiscock K. Marine Life Information Network: Biology and Sensitivity Key Information Reviews, [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 23-05-2025]. Available from: https://www.marlin.ac.uk/species/detail/1524

Last Updated: 20/08/2008