Fin's Fish Guide
The Jack (Nematistius pectoralis) is a saltwater fish of the family Nematistiidae that grows up to 163 cm.
Description
The roosterfish is a striking coastal fish of the eastern Pacific, the only species of the family Nematistiidae. The species grows to about 1.6 metres and owes its name to the seven greatly elongated, thread-like rays of the first dorsal fin, which can be raised like a rooster's comb. The silvery body bears two dark oblique bands. Adults inhabit shallow coastal waters and sandy beaches, juveniles stay in tide pools. As a fast predator it hunts small fishes. The roosterfish is a highly prized sport fish caught on lures and usually released. It is harmless to humans.
Frequently asked questions
How do you recognise the Jack?
The Jack has a torpedo-shaped body, is mainly silver-grey and shows a vertical stripes pattern. Seven elongated, thread-like dorsal fin rays raised like a cockscomb; sought-after sport fish.
Where does the Jack live?
The Jack lives in the sea (marine waters) and is mostly found around sand or mud bottom. Eastern Pacific; shallow coastal waters and sandy beaches.
How big does the Jack get?
The Jack grows to a maximum of about 163 cm. On average the species is around 60 cm.
Is the Jack dangerous to humans?
No, the Jack is harmless to humans. None required: this species is harmless to humans.
Is the Jack edible?
The Jack is rarely eaten.
More photos
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All data
Identification
Appearance
Habitat & distribution
Behaviour & biology
For anglers
Safety
Status & sources
Want the complete picture on the Jack?
Point your camera at the fish and Fin names the species in seconds. Free, and the Jack is one of 12,519 species in the app.