Orangestripe Triggerfish

Balistapus undulatus

Orangestripe Triggerfish (Balistapus undulatus) is a reef-associated triggerfish with bold orange lines and a powerful jaw. It is common on tropical Indo-Pacific coral reefs and is notorious for aggressive territory defense, especially when nesting or feeding.

Saltwater

Orangestripe Triggerfish reference image — Rickard Zerpe, cc-by, via Wikimedia Commons. Source: Wikimedia Commons.

Identification points

Bright orange to reddish longitudinal stripes on a dark body
Rugged triggerfish shape with small mouth and thick, leathery skin
Pale to orange-edged fins, often with a dark tail base and banded look

Habitat

Shallow coral and rocky reefs, lagoon edges, seaward reef flats, and outer reef slopes in tropical Indo-Pacific waters; usually tight to structure and coral heads.

Bait notes

Not a common sport species; when targeted, small pieces of shrimp, crab, clam, squid, or reef fish bait can work. Small metal jigs and bottom-presented cut bait may draw strikes, but bite-offs and quick thefts are common.

Behavior

Feeds on hard-shelled invertebrates, including crustaceans, mollusks, and urchins, using strong teeth and jaw plates. Often solitary or in pairs, highly territorial, and may attack intruders near nests.

Caution

Can inflict painful bites with strong teeth and spines, and is often aggressive around nests. In some tropical areas, larger individuals may pose ciguatera risk if eaten; check local advisories and regulations.

Fishing notes

Fish close to reef structure with short soak times and strong tackle; keep gear tight because it dives hard into holes. Use abrasion-resistant leader and be ready to lift fish clear of coral quickly.