Hyporthodus quernus (Seale, 1901)
Hawaiian grouper
Hapu'u,  Hawaiian grouper,  Hapu'upu'u,  Hapuu puu,  Hawaiian black grouper,  Hawaiian sea bass,  Seale's grouper
Hyporthodus quernus
photo by Randall, J.E.

Family:  Epinephelidae (Groupers)
Max. size:  122 cm TL (male/unsexed); max.weight: 23 kg
Environment:  benthopelagic; marine; depth range 5 - 380 m
Distribution:  Eastern Central Pacific: known only from the Hawaiian Islands and Johnston Island.
Diagnosis:  Dorsal spines (total): 11-11; Dorsal soft rays (total): 14-15; Anal spines: 3-3; Anal soft rays: 9-9. Distinguished by the following characteristics: juveniles greyish brown to dark brown body color with 8 vertical series of white spots on body; adults dark brown with less distinct vertical series of white spots and obscured by numerous additional pale spots and blotches of variable size; fins mostly unspotted; depth of body contained 2.3-2.7 times in SL, width 2.0-2.5 times in depth; head length 2.3-2.5 times in SL; convex interorbital area, width subequal to eye diameter for fish 10-20cm SL; subangular preopercle, 3-5 enlarged serrae at angle; fleshy ventral edge of preopercle, without serrae; smooth edge of interopercle and subopercle or with a few serrae; convex upper edge of operculum; ovate and enlarged posterior nostrils of adults, larger than anterior nostrils (Ref. 89707).
Biology:  Occurs in deep waters (Ref. 7364). Benthic and benthopelagic (Ref. 58302). Feeds mainly on fish and crustaceans (Ref. 89707). A good fish to eat, fleshy, eaten any way except raw (Ref. 7364). Minimum depth from Ref. 122680.
IUCN Red List Status: Least Concern (LC); Date assessed: 21 March 2018 Ref. (130435)
Threat to humans:  harmless
Country info:  Known from Hawai'i Island to Kure Atoll and Bank 11 (Ref. 58302). Museum: USNM 51079; BPBM 3961, 9033, 16266, 19554, 24396, 481 (Holotype of E. quernus), 3962, 6476, 15458, 24411, 33446, 3960; NMW 4528; ANSP 83859, 90584. Also Ref. 4560, 4787, 89707, 122680.


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