Green humphead parrotfish
|Green humphead parrotfish|
J. L. B. Smith, 1956
Other common names include bumphead parrotfish, humphead parrotfish, double-headed parrotfish, buffalo parrotfish, and giant parrotfish.
It is the only species in the monotypic genus Bolbometopon.
Unlike wrasses, it has a vertical head profile, and unlike other parrotfishes, it is uniformly covered with scales except for the leading edge of the head, which is often light green to pink. Primary phase colouration is a dull gray with scattered white spots, gradually becoming uniformly dark green. This species does not display sex-associated patterns of color change. The adult develops a bulbous forehead and the teeth plates are exposed, being only partly covered by lips. The species is slow-growing and long-lived (up to 40 years), with delayed reproduction and low replenishment rates.
This species is gregarious and usually occurs in small aggregations, but group size can be quite large on seaward and clear outer lagoon reefs, exceeding 75 individuals.
The fish spawn pelagically near the outer reef slope or near promontories, gutters, or channel mouths during a lunar cycle, usually spawning just prior to the new moon. They make use spawning aggregation sites.
Newly settled juveniles are found in branching coral habitats (primarily Acropora) in sheltered lagoons. Small juveniles (<50mm) are often associated with Damselfish. Larger juvenile green humphead parrotfish are found in lagoons, often in seagrass beds, and the adults are found in clear outer lagoons and seaward reefs up to a depth of 30 m. They feed on benthic algae and live corals.
Adult green humphead parrotfish may ram its head against corals to facilitate feeding. Each adult fish ingests over five tons of structural reef carbonates per year, contributing significantly to the bioerosion of reefs. The fish sleeps among corals, in caves and shipwrecks at night, usually in large groups.
The large size, slow growth and schooling behavior of this species mean it is susceptible to overfishing. This species is highly sought after by fishermen throughout its range, and it has declined from overharvesting . Spearfishers and netters target the large groups as they sleep at night. This is a NOAA Species of Concern, thought to be threatened, but for which insufficient data are available to justify a listing under the Endangered Species Act.
Spearfishing while scuba diving was banned in American Samoa in 2001. The waters surrounding Wake Island, Johnston Atoll, and Palmyra Atoll from the shoreline out to 50 fathoms (91 m) are protected as low-use marine protected areas, which means any person of the United States fishing for, taking, or retaining this fish must have a special permit. Also, it may not be taken by means of spearfishing with SCUBA gear from 6 pm to 6 am in the US Exclusive Economic Zone waters around these territories. The population of the fish in Palau is now protected by an export ban.
- Chan, T.; et al. (2012). "Bolbometopon muricatum". IUCN Red List of Threatened Species. Version 2012.2. International Union for Conservation of Nature. Retrieved 9 June 2013.
- Froese, Rainer and Pauly, Daniel, eds. (2006). "Bolbometopon muricatum" in FishBase. March 2006 version.
- Taylor, Brett M.; Hamilton, Richard J.; Almany, Glenn R.; Howard Choat, J. (2018-12-01). "The world's largest parrotfish has slow growth and a complex reproductive ecology". Coral Reefs. 37 (4): 1197–1208. doi:10.1007/s00338-018-1723-9. ISSN 1432-0975.
- Hamilton; et al. (June 2017). "Logging degrades nursery habitat for an iconic coral reef fish". www.sciencedirect.com. Biological Conservation. Retrieved 2019-03-03.
- Aquatic Life of the World. Marshall Cavendish. 2001. pp. 411–. ISBN 978-0-7614-7177-6.
- "Bumphead Parrotfish". fiji.wcs.org.
- Fisheries, NOAA. "Proactive Conservation Program: Species of Concern :: NOAA Fisheries". www.nmfs.noaa.gov.
- Fishery Management Plan for Coral Reef Ecosystems of the Western Pacific Region: Environmental Impact Statement. 2001. pp. 281–.
- Gene S. Helfman (15 July 2007). Fish Conservation: A Guide to Understanding and Restoring Global Aquatic Biodiversity and Fishery Resources. Island Press. pp. 359–. ISBN 978-1-59726-760-1.
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