Kyphosus bigibbus Lacep├Ęde, 1801
Brown chub
Kyphosus bigibbus
photo by Randall, J.E.

Family:  Kyphosidae (Sea chubs)
Max. size:  75 cm TL (male/unsexed); max.weight: 1,850.0 g
Environment:  reef-associated; marine; depth range - 2 m, oceanodromous
Distribution:  Indo-Pacific: Antitropical; Red Sea, South Africa, western and eastern Australia, Lord Howe and Rapa islands, southern Japan and Ryukyu Islands. Records for countries in the tropical zone needs further confirmation.
Diagnosis:  Dorsal spines (total): 11-11; Dorsal soft rays (total): 11-12; Anal spines: 3-3; Anal soft rays: 10-12; Vertebrae: 16-16. This species is distinguished by the following characters: terminal mouth is almost in an oblique angle; presence of scales in the interorbital region; D XI,11-12 rays; A III,10-12; gill rakers externally on first arch 4-7 + 13-17; pectoral fin is relatively short, 13.6-21.3 %SL); anal-fin base relatively long (18.1-24.8 %SL; lateral line scales 61-76, with pores 51-60; longitudinal scales 54-67; cheek scales 9-16; vertebrae 10 + 16; low number of pterygiophores, dorsal 20-21 and anal 12. Colour of body variable brownish to silvery with dusky unpaired fins when fresh; soft parts of the dorsal and anal fins appear dusky and have black or darker edges; dark edges on dorsal, anal and caudal fins appear pronounced in more adult individuals, but may also vary from habitat to habitat; cheek and area below eye usually with a white or silvery streak (Ref. 95491).
Biology:  Found around exposed seaward reefs of isolated high islands such as the northernmost Mariana and Bonin Is. Feeds on Sargassum and Turbinaria algae. Valued as a food fish, but not in Hawaii (Ref. 3921).
IUCN Red List Status: Least Concern (LC); Date assessed: 07 July 2014 Ref. (126983)
Threat to humans:  harmless
Country info:  Found in Halsey Harbor, Culion Island (Ref. 48613) and Lanuza Bay (Ref. 104756).

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