The giant grouper is a species of shallow water fish and can be found at depths of 1 to 100 metres (3.3 to 328.1 ft). It is associated with reefs and is the largest known bony fish found on reefs. Large specimens have been caught from shore and in harbours. They are found in caves and in wrecks while the secretive juveniles occur in reefs and are infrequently observed. The adults are mainly solitary and hold territories on the outer reef and in lagoons. They have also been caught in turbid water over silt or mud sea beds by prawn fishermen. The giant grouper is an opportunistic ambush predator which feeds on a variety of fishes, as well as small sharks, juvenile sea turtles, crustaceans and molluscs which are all swallowed whole. Fish which inhabit coral reefs and rocky areas favour spiny lobsters as prey; a 177-centimetre (70 in) specimen taken off Maui in Hawaii had a stomach content of two spiny lobsters and a number of crabs. Fish living in estuarine environments in South Africa were found to be feeding almost exclusively on the crab Scylla serrata. This species is normally solitary and long-lived. They are, however, curious and frequently approach divers closely. They are not generally considered dangerous to humans but divers are advised to treat large specimens with caution and not to hand feed them as there have been reports of large specimen attacking humans.
The giant grouper is a highly valued food fish and is taken by both commercial and recreational fisheries. It is valued in Hong Kong as a live fish for the live reef food fish trade, especially smaller specimens, and its skin, gall bladder, and stomach, are used in Traditional Chinese Medicine. This species is cultured in mariculture and this practice is widespread but there is a restricted supply of juveniles, although hatcheries in Taiwan have produced captive bred juveniles, exporting some for to be grown on in other parts of South-East Asia. Many of the fish produced in aquaculture are hybrids between this species and E. fuscoguttatus.
Heemstra, P.C. & J.E. Randall (1993). FAO Species Catalogue. Vol. 16. Groupers of the world (family Serranidae, subfamily Epinephelinae). An annotated and illustrated catalogue of the grouper, rock-cod, hind, coral grouper and lyretail species known to date (PDF). FAO Fish. Synopsis. Vol. 125. FAO, Rome. pp. 174–175. ISBN 92-5-103125-8. 92-5-103125-8
Froese, Rainer; Pauly, Daniel (eds.). "Epinephelus lanceolatus". FishBase. December 2019 version. /wiki/Rainer_Froese
Heemstra, P.C. & J.E. Randall (1993). FAO Species Catalogue. Vol. 16. Groupers of the world (family Serranidae, subfamily Epinephelinae). An annotated and illustrated catalogue of the grouper, rock-cod, hind, coral grouper and lyretail species known to date (PDF). FAO Fish. Synopsis. Vol. 125. FAO, Rome. pp. 174–175. ISBN 92-5-103125-8. 92-5-103125-8
Bray, D.J. (2019). "Epinephelus lanceolatus". Fishes of Australia. Museums Victoria. Retrieved 9 July 2020. http://136.154.202.208/home/species/4672
Froese, Rainer; Pauly, Daniel (eds.). "Epinephelus lanceolatus". FishBase. December 2019 version. /wiki/Rainer_Froese
Rimmer, Mike (2019). "Epinephelus lanceolatus (giant grouper)". CABI Compendium. CABI Compendium. CAB International. doi:10.1079/cabicompendium.83923. Retrieved 9 July 2020. https://www.cabi.org/isc/datasheet/83923#tosummaryOfInvasiveness
Fennessy, S.; Pollard, D.A.; Samoilys, M. (2018). "Epinephelus lanceolatus". IUCN Red List of Threatened Species. 2018: e.T7858A100465809. doi:10.2305/IUCN.UK.2018-2.RLTS.T7858A100465809.en. Retrieved 19 November 2021. https://www.iucnredlist.org/species/7858/100465809
Bray, D.J. (2019). "Epinephelus lanceolatus". Fishes of Australia. Museums Victoria. Retrieved 9 July 2020. http://136.154.202.208/home/species/4672
Fennessy, S.; Pollard, D.A.; Samoilys, M. (2018). "Epinephelus lanceolatus". IUCN Red List of Threatened Species. 2018: e.T7858A100465809. doi:10.2305/IUCN.UK.2018-2.RLTS.T7858A100465809.en. Retrieved 19 November 2021. https://www.iucnredlist.org/species/7858/100465809
Froese, Rainer; Pauly, Daniel (eds.). "Epinephelus lanceolatus". FishBase. December 2019 version. /wiki/Rainer_Froese
Fennessy, S.; Pollard, D.A.; Samoilys, M. (2018). "Epinephelus lanceolatus". IUCN Red List of Threatened Species. 2018: e.T7858A100465809. doi:10.2305/IUCN.UK.2018-2.RLTS.T7858A100465809.en. Retrieved 19 November 2021. https://www.iucnredlist.org/species/7858/100465809
Rimmer, Mike (2019). "Epinephelus lanceolatus (giant grouper)". CABI Compendium. CABI Compendium. CAB International. doi:10.1079/cabicompendium.83923. Retrieved 9 July 2020. https://www.cabi.org/isc/datasheet/83923#tosummaryOfInvasiveness
Fennessy, S.; Pollard, D.A.; Samoilys, M. (2018). "Epinephelus lanceolatus". IUCN Red List of Threatened Species. 2018: e.T7858A100465809. doi:10.2305/IUCN.UK.2018-2.RLTS.T7858A100465809.en. Retrieved 19 November 2021. https://www.iucnredlist.org/species/7858/100465809
Heemstra, P.C. & J.E. Randall (1993). FAO Species Catalogue. Vol. 16. Groupers of the world (family Serranidae, subfamily Epinephelinae). An annotated and illustrated catalogue of the grouper, rock-cod, hind, coral grouper and lyretail species known to date (PDF). FAO Fish. Synopsis. Vol. 125. FAO, Rome. pp. 174–175. ISBN 92-5-103125-8. 92-5-103125-8
Froese, Rainer; Pauly, Daniel (eds.). "Epinephelus lanceolatus". FishBase. December 2019 version. /wiki/Rainer_Froese
Fennessy, S.; Pollard, D.A.; Samoilys, M. (2018). "Epinephelus lanceolatus". IUCN Red List of Threatened Species. 2018: e.T7858A100465809. doi:10.2305/IUCN.UK.2018-2.RLTS.T7858A100465809.en. Retrieved 19 November 2021. https://www.iucnredlist.org/species/7858/100465809
"Giant Queensland groper". Department of Primary Industries. State of New South Wales. Retrieved 9 July 2020. https://www.dpi.nsw.gov.au/fishing/closures/identifying/marine-or-estuarine-species/giant-queensland-groper
Heemstra, P.C. & J.E. Randall (1993). FAO Species Catalogue. Vol. 16. Groupers of the world (family Serranidae, subfamily Epinephelinae). An annotated and illustrated catalogue of the grouper, rock-cod, hind, coral grouper and lyretail species known to date (PDF). FAO Fish. Synopsis. Vol. 125. FAO, Rome. pp. 174–175. ISBN 92-5-103125-8. 92-5-103125-8
"Giant Queensland groper". Department of Primary Industries. State of New South Wales. Retrieved 9 July 2020. https://www.dpi.nsw.gov.au/fishing/closures/identifying/marine-or-estuarine-species/giant-queensland-groper
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Bright, David; Reynolds, Adam; Nguyen, Nguyen H.; et al. (June 2016). "A study into parental assignment of the communal spawning protogynous hermaphrodite, giant grouper (Epinephelus lanceolatus)". Aquaculture. 459: 19–25. Bibcode:2016Aquac.459...19B. doi:10.1016/j.aquaculture.2016.03.013. https://zenodo.org/record/1232168
Peter Palma; Akihiro Takemura; Gardel Xyza Libunaoa; et al. (2019). "Reproductive development of the threatened giant grouper Epinephelus lanceolatus". Aquaculture. 509: 1–7. Bibcode:2019Aquac.509....1P. doi:10.1016/j.aquaculture.2019.05.001. /wiki/Bibcode_(identifier)
Eschmeyer, William N.; Fricke, Ron & van der Laan, Richard (eds.). "Holocentrus lanceolatus". Catalog of Fishes. California Academy of Sciences. Retrieved 9 July 2020. /wiki/William_N._Eschmeyer
Heemstra, P.C. & J.E. Randall (1993). FAO Species Catalogue. Vol. 16. Groupers of the world (family Serranidae, subfamily Epinephelinae). An annotated and illustrated catalogue of the grouper, rock-cod, hind, coral grouper and lyretail species known to date (PDF). FAO Fish. Synopsis. Vol. 125. FAO, Rome. pp. 174–175. ISBN 92-5-103125-8. 92-5-103125-8
Fennessy, S.; Pollard, D.A.; Samoilys, M. (2018). "Epinephelus lanceolatus". IUCN Red List of Threatened Species. 2018: e.T7858A100465809. doi:10.2305/IUCN.UK.2018-2.RLTS.T7858A100465809.en. Retrieved 19 November 2021. https://www.iucnredlist.org/species/7858/100465809
Rimmer, Mike (2019). "Epinephelus lanceolatus (giant grouper)". CABI Compendium. CABI Compendium. CAB International. doi:10.1079/cabicompendium.83923. Retrieved 9 July 2020. https://www.cabi.org/isc/datasheet/83923#tosummaryOfInvasiveness
Fennessy, S.; Pollard, D.A.; Samoilys, M. (2018). "Epinephelus lanceolatus". IUCN Red List of Threatened Species. 2018: e.T7858A100465809. doi:10.2305/IUCN.UK.2018-2.RLTS.T7858A100465809.en. Retrieved 19 November 2021. https://www.iucnredlist.org/species/7858/100465809
"'Bubba,' Famed Cancer-surviving Grouper, R.I.P.; 'Overcame Some Incredible Odds'". Underwatertimes.com News Service. Underwatertimes. 2006-08-24. Retrieved 27 May 2012. http://www.underwatertimes.com/news.php?article_id=71021389645