Optivus agrammus Gomon, 2004
Western roughy

Family:  Trachichthyidae (Slimeheads)
Max. size:  9.1 cm SL (male/unsexed)
Environment:  reef-associated; marine; depth range 40 - 320 m
Distribution:  Eastern Indian Ocean: Australia.
Diagnosis:  Dorsal spines (total): 3-3; Dorsal soft rays (total): 10-11; Anal spines: 3-3; Anal soft rays: 9-10; Vertebrae: 26-26. This species is distinguished by the following characters: 20-24 (modally 22) gill rakers; gently curved lateral profile of nape and dorsal surface of head, nearly horizontal in front of dorsal-fin origin, almost straight between eyes; broadly rounded tip of snout; 2.7-2.9 times in SL, depth of head at vertical through upper end of gill opening; snout length is 1.5-2.6 times in eye diameter; the inner row of teeth on premaxilla is noticeably longer than others; relatively short and deep caudal peduncle, depth 0. 9-1.2 in length; dorsal and anal fins are relatively low, third segmented dorsal-fin ray 3.8-4.6 times in SL, first anal-fin ray 5.6-8.2 times in SL; body color greenish brown on back, silvery below; fins almost uniformly pink, though slightly dusky tips to caudal-fin lobes lasting in recently preserved large specimens (Ref. 76814).
Biology: 
IUCN Red List Status: Least Concern (LC); Date assessed: 26 December 2019 Ref. (130435)
Threat to humans:  harmless


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