Classification / Names
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Actinopterygii (ray-finned fishes) > Beryciformes
(Sawbellies) > Trachichthyidae
Etymology: Optivus: Latin, optivus, -a-um = chosen; agastos: Name from a Greek word meaning 'near kinsman', referring to its similarity and presumed close relationship to Trachichthys elongatus Günther, 1859.
Environment: milieu / climate zone / depth range / distribution range
Marine; reef-associated; depth range 1 - 146 m (Ref. 76814). Temperate
Southwest Pacific : Australia and New Zealand (Ref. 86942).
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 9.5 cm SL male/unsexed; (Ref. 76814)
Morphology | Morphometrics
(total): 4 - 5;
soft rays: 9 - 10;
Vertebrae: 26. This species is characterized by the following: gill rakers 22-25 (modally 23); lateral profile of nape and head nearly straight, distinctly angled downward in front of dorsal fin; snout tip rounded, often projecting slightly in front of upper jaw; depth of head at vertical through upper end of gill opening 2.9-3.2 times in SL; snout length 1.6-2.7 times in eye diameter; inner row of teeth on premaxilla is noticeably longer than others; caudal peduncle relatively short and deep, its depth 0.9-1.3 times in length; dorsal and anal fins are relatively low, third
segmented dorsal-fin ray 3.5-4.2 times in SL, first anal-fin ray 5.2-6.3 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).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Gomon, M.F., 2004. Two new species of roughy (Trachichthyidae: Optivus) from coastal waters of southern Australia. Rec. Aust. Mus. 56:173-178. (Ref. 76814)
IUCN Red List Status (Ref. 120744)
CITES (Ref. 118484)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates based on models
Preferred temperature (Ref. 115969
): 14.6 - 24.3, mean 17 (based on 314 cells).
Phylogenetic diversity index (Ref. 82805
= 0.6250 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01072 (0.00421 - 0.02727), b=3.02 (2.80 - 3.24), in cm Total Length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic Level (Ref. 69278
): 3.5 ±0.6 se; Based on size and trophs of closest relatives
Resilience (Ref. 120179
): Medium, minimum population doubling time 1.4 - 4.4 years (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153
): Moderate vulnerability (39 of 100) .