The slender roughy (Optivus elongatus) is a fish of the family Trachichthyidae. Until 2004 when two new species were described, the slender roughy was believed to be the only species in the genus Optivus. The slender roughy is found in the southwestern Pacific Ocean around New Zealand at depths between .Tony Ayling & Geoffrey Cox, Collins Guide to the Sea Fishes of New Zealand, (William Collins Publishers Ltd, Auckland, New Zealand 1982) Its length is up to standard length or overall total length.Thompson, A. 1981. The fish of the Cape Rodney to Okakari Point Marine Reserve. Leigh Laboratory, University of Auckland. 364 p.Roberts, C.D., Stewart, A.L. and Struthers, C.D. (eds.) 2015. The Fishes of New Zealand. Te Papa Press, Wellington. 2008 p. [Vol. 1: S1-S256; vol. 2: 1-576; vol. 3: 577-1152; vol. 4: 1153-1748]
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