Oneknife unicornfish (Naso thynnoides)

Scientific name: Naso thynnoides Cuvier, 1829

The Oneknife unicornfish (Naso thynnoides) is a marine fish of the family Acanthuridae. In the aquarium it needs water at 22–24°C (72–75°F).

Oneknife unicornfish care at a glance

Temperature: 22–24°C (72–75°F)

Biology

Dorsal spines (total): 4; Dorsal soft rays (total): 28-30; Anal spines: 2; Anal soft rays: 27 - 29. Body elongate-ovate. Dorsal and anal profiles nearly even. Forehead without rostral prominence when in adults. Peduncular plate single, with a semicircular, retrorsely curved keel. Reaches 35 cm SL.

Source: FishBase, licensed CC BY-NC 4.0.

Species facts

Scientific name: Naso thynnoides
Family: Acanthuridae (Surgeonfishes, tangs, unicornfishes)
Order: Perciformes (Perch-like fish)
Class: Actinopterygii (Ray-finned fishes)
Maximum length: 40.0
Common length: 25.0
Depth range: 2–40 m (7–131 ft)
Environment: Marine; reef-associated; depth range 2 - 40 m, usually 10 - ? m
Climate: Tropical
Distribution: Indo-Pacific: East Africa to Micronesia (excluding the Marshall Islands), north to the Ryukyu Islands, south to the Solomon Islands and the Great Barrier Reef. Range extending to Rangiroa Atoll, Tuamotu Archipelago.
Conservation status (IUCN): Not Evaluated
Threat to humans: Harmless
Uses: Fisheries: commercial; aquarium: commercial
Resilience: Medium, minimum population doubling time 1.4 - 4.4 years (Preliminary K or Fecundity.)