Black-axil Chromis
Chromis atripectoralis
Black-axil Chromis is a small reef-dwelling damselfish found on tropical coral reefs, typically associated with outer reef slopes and lagoons. It forms loose aggregations above branching corals and feeds mainly on plankton in the water column.
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Identification points
- Small chromis with a slender, oval blue-green body typical of reef damselfish.
- Distinct dark axillary spot at the base of the pectoral fin, the feature referenced by the common name.
- Usually shows a forked tail and translucent fins while hovering above branching coral.
Habitat
Tropical coral reefs, especially clear lagoon and seaward reef habitats with branching corals; commonly above sheltered reef edges and slopes where plankton flow is steady.
Bait notes
Not a targeted angling species and rarely taken intentionally. If encountered incidentally on very small reef gear, tiny natural baits or micro jigs/plankton-style offerings may draw strikes, but it is generally too small for practical sport fishing.
Behavior
An active midwater planktivore that hovers above coral heads and darts into the water column to pick drifting zooplankton. Usually occurs in small groups and retreats quickly into coral cover when disturbed.
Caution
Reef-associated species may be subject to local marine-protected-area or ornamental-collection restrictions. As a small tropical reef fish, consumption is uncommon; local advisories should be checked for reef-fish toxins where applicable.
Fishing notes
No dedicated recreational fishery is typical. Reef anglers should avoid chasing it around live coral; if collecting for research or aquaria, use legal, low-impact methods and verify local reef-fish regulations and coral-protection rules.