Spiny Chromis

Acanthochromis polyacanthus

Spiny Chromis is an Indo-Pacific damselfish that lives closely associated with coral reefs, especially lagoon and seaward-reef areas. It is notable for lacking a pelagic larval stage; young stay with their parents, and the species is more of an aquarium/reef fish than a target for anglers.

Saltwater

Spiny Chromis reference image — Rickard Zerpe, cc-by, via Wikimedia Commons. Source: Wikimedia Commons.

Identification points

Deep, laterally compressed damselfish body with a long continuous dorsal fin
Adult body usually dark brown to blackish with pale or whitish margins on fins
Juveniles are plain dark and stay in tight family groups around branching coral

Habitat

Coral reefs and reef flats, especially sheltered lagoons, back reefs, and seaward reef slopes with branching or massive coral cover; usually close to the bottom and sheltering in coral heads.

Bait notes

Not a standard sport fish. If encountered while reef fishing, it may take very small pieces of shrimp, mysid-sized bait, or tiny planktonic flies/micro-jigs; most anglers do not target it.

Behavior

Forms small family groups and defends a local coral territory. It feeds mainly on plankton and tiny benthic invertebrates, picking and darting in the water column near the reef.

Caution

Coral-reef habitat means spines and sharp coral can cause cuts; watch for reef etiquette and local reef-protection rules. Not typically eaten, so consumption guidance is limited.

Fishing notes

Best approached with ultra-light tackle near shallow coral structure or with very small artificial flies/jigs presented delicately. Handle minimally and release quickly if caught, as reef-dwelling damselfishes are easily stressed.