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Blue Chromis

Azurina cyanea

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Original identification illustration of Blue Chromis (Azurina cyanea), adult, viewed from the side.
Illustration for identification. Features may vary.

Fun facts for your next surface interval

  • Blue comes with trim: the dark borders on the tail are part of the identification.
  • A school lunch can be microscopic: copepods are important prey.
  • Same fish, updated name: current accounts use Azurina cyanea rather than Chromis cyanea.

Florida and local context

Florida-wide documented range; Palm Beach frequency not established: The cited distribution explicitly includes Florida. No Palm Beach abundance or guaranteed sighting is inferred.

Documented regional presence is not a guarantee of an encounter or a measure of how common this animal is at your dive site.

How to recognize this animal

Blue Chromis is an elongated, laterally compressed damselfish colored deep electric blue. A dark line follows the upper back, and black edging marks the upper and lower lobes of its deeply forked tail. The pointed tail and streamlined outline are useful even when blue light makes several reef fishes look similar. There is no conspicuous black spot at the pectoral-fin base.

Size and life stages

The species reaches about 15 cm in total length. Many fish encountered over a reef are smaller than that maximum. In a loose group, choose one individual and follow its complete outline instead of blending several overlapping bodies into one identification. A small fish close to the mask can appear larger than a more distant member of the same group.

Habitat and where to look

Blue Chromis uses reefs and the water above coral heads, including outer-reef settings. It can retreat into crevices when alarmed. Observe from outside the group's space rather than swimming through it to reach the brightest individual. A fish that remains above its shelter offers a much better natural view than one repeatedly driven back into the reef.

Range and local context

Authoritative distribution accounts include southern Florida, Bermuda, the Bahamas and the Caribbean. The current accepted combination used here is Azurina cyanea, with Chromis cyanea retained as a searchable older name. The Lake Worth Lagoon checklist row lacks verification, so this profile uses Florida-wide evidence and does not turn that blank row into a confirmed Palm Beach locality.

What is on the menu?

Its food is small zooplankton, especially copepods. Fish may feed in aggregations above the reef, picking prey from moving water with quick, precise movements. You may not see the prey itself. Rather than describing the group as aimlessly hovering, look for repeated feeding darts and pauses, while keeping a comfortable distance that allows the pattern to continue.

Daily habits and behavior

The species can occur alongside other water-column feeders, including creole wrasse. A mixed group is not necessarily made up entirely of Blue Chromis. Track the blue fish separately and compare tail shape, head shape and swimming position. When disturbed, individuals may disappear into nearby shelter; waiting quietly is more useful than trying to flush them out again.

Mating and the next generation

Although adults feed in open water, reproduction involves eggs attached to the bottom. Pairs spawn, and males guard and aerate the eggs. The later larvae occupy open water. This contrast is a useful reminder that a feeding school does not identify a spawning site. Avoid investigating a bottom patch by touching it or moving material away.

Look-alikes and identification traps

Purple Reeffish can have blue juveniles, but its adult coloration and rounded tail tips differ. Brown Chromis has gray-brown coloration and useful dark pectoral-base and white rear-body marks. An Indo-Pacific aquarium fish sold under a similar chromis name is not a substitute for this Atlantic species. Geography and several visible traits should agree before assigning the name.

Observe without disturbing

Let the group keep its normal spacing. Do not feed it, corner fish against a coral head or make repeated close passes for a synchronized photograph. Keep fins away from the shelter below and remain aware of your buddy while watching the water column. Record uncertain fish separately rather than counting every blue shape as another confirmed individual of the same species.

Harvest, protection and eating safety

Restricted marine life: live collection only; no spearing

Can it be hunted or harvested?

Blue Chromis is regulated live ornamental marine life, not an ordinary food-fishing target. FWC lists no species-specific size limit for this damselfish. A saltwater fishing license is required unless exempt. Fish must be landed and kept alive with adequate aeration or circulating water. Daily limit: five of this species within 20 marine-life organisms; possession: ten within 40. Recreational sale is prohibited.

Florida seasons and areas

No recreational closed months are listed for this species in the reviewed marine-life rules. Collection is prohibited within the designated Blue Heron Bridge dive site. Florida marine-life rules also apply in adjacent federal waters. Sanctuary no-take zones and other park or refuge restrictions can close otherwise eligible areas; check the exact site before collecting.

Can it be speared?

Prohibited. FWC expressly includes damselfishes among ornamental reef-fish families that cannot be taken by spearing. Chromis and reeffishes are damselfishes too.

Is it safe to eat?

This live-collection classification is not an eating-safety approval. No species-specific Florida consumption clearance was verified. Do not assume a fish is safe because it is small, colorful or absent from an advisory chart. Marine toxins can cause illness despite cooking; consult current local health guidance rather than using this identification page as permission to eat it.

Before you act: This recreational overview is not permission to collect or spear at your dive site. Confirm the species, date, management area, state or federal waters, gear, licenses and current local closures. Identification artwork cannot establish an identification or guarantee seafood safety.

Official rules and health guidance

Reviewed 2026-11-10. Rules and advisories can change; check the linked authorities before harvesting or eating.

Sources and review

Reviewed 2026-11-10.

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