Western Roughy, Optivus agrammus Gomon 2004


A Western Roughy, Optivus agrammus, at night at the wreck of the Omeo, Port Coogee, Perth, Western Australia, 23 May 2018, depth ~2.5m. Source: Glen Whisson / Aqua Research and Monitoring Services. License: All rights reserved

Summary:
A small greenish-brown roughy becoming silvery below, with pinkish fins and dusky red tips on caudal fin lobes.

Cite this page as:
Bray, D.J. 2018, Optivus agrammus in Fishes of Australia, accessed 15 Dec 2018, http://fishesofaustralia.net.au/home/species/1740

Western Roughy, Optivus agrammus Gomon 2004

More Info


Distribution

Endemic to southern Australia, from Venus Bay, South Australia, to the Houtman Abrolhos islands, Western Australia. Found near reefs in depths to 320 m.

Features

Dorsal fin III-V, 10-11; Anal fin III, 9-10; Caudal fin 19; Pectoral fin 12-13; Pelvic fin I, 6; Lateral line scales 26; Scales above lateral line 9-11; scales below lateral line 12-15; Predorsal scales 27–29; Ventral scutes 9-11; Gill rakers 20-24; Vertebrae 12 + 14.
Lateral profile of nape and dorsal surface of head gently curved, nearly horizontal in front of dorsal-fin origin, almost straight between eyes; tip of snout broadly rounded; depth of head at vertical through upper end of gill opening 2.7–2.9 times in SL; snout length 1.5–2.6 times in eye diameter; inner row of teeth on premaxilla noticeably longer than others; caudal peduncle relatively short and deep, depth 0. 9–1.2 in length; dorsal and anal fins 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.

Colour

Body greenish-brown on back, silvery below; fins almost uniformly pink, though slightly dusky tips to caudal-fin lobes.

Similar Species

Differs from the Violet Roughy, Optivus agastos, in lacking the brown stripe along each caudal fin lobe 

Etymology

The specific name agrammus, isfrom the Greek a, meaning “without”, and gramme, for “line”, in reference to the absence of stripes on the caudal fin of this species.

Species Citation

Optivus agrammus Gomon 2004, Rec. Aust. Mus. 56: .176, figs 1-2. Type locality: Great Australian Bight, SA [31°50'S, 130°45'E]. 

Author

Bray, D.J. 2018

Resources

Australian Faunal Directory

Western Roughy, Optivus agrammus Gomon 2004

References


Gomon, M.F. 1994. Families Trachichthyidae, Monocentridae. pp. 399-412 figs 358-369 in Gomon, M.F., Glover, C.J.M. & Kuiter, R.H. (eds). The Fishes of Australia's South Coast. Adelaide : State Printer 992 pp. 810 figs. (as Optivus sp. 2)

Gomon, M.F. 2004. Two new species of roughy (Trachichthyidae: Optivus) from coastal waters of southern Australia. Records of the Australian Museum 56: 173-178 DOI:10.3853/j.0067-1975.56.2004.1419 See ref online, open access

Gomon, M.F. 2008. Family Trachichthyidae. pp. 420-430 in Gomon, M.F., Bray, D.J. & Kuiter, R.H. (eds). Fishes of Australia's Southern Coast. Sydney : Reed New Holland 928 pp.

Kotlyar, A.N., 1996. Beryciform Fishes of the World Ocean. Moscow: VNIRO Publishing, 368 pp. (as Optivus sp. 2)


McKay, R.J. 1970. Additions to the fish fauna of Western Australia—5. Department of Fisheries and Fauna Western Australia, Fisheries Bulletin 9(5): 1–24 (as Optivus elongatus)


May, J.L. & Maxwell, J.G.H. 1986. Field Guide to Trawl Fish from Temperate Waters of Australia. Hobart : CSIRO Division of Marine Research 492 pp. (as Optivus n. sp.)

Quick Facts


CAAB Code:37255016

Depth:2-320 m (usually >40m)

Depth:40–320 m

Native:Endemic

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