Fish identification archive / Boulder Brain Coral

Boulder Brain Coral

Colpophyllia natans

Fun facts for your next surface interval

The ridges can carry a fine groove along their tops. [source]
Its tentacles extend at night. [source]
NOAA included this species in its September 2025 spawning work. [source]

Florida and local context

Brinkhuis and Huebner list Colpophyllia natans among species directly observed during the Grecian Rocks CREMP dive survey on 16 July 2016.

A documented past record does not establish present abundance or guarantee an encounter.

Sources: Local occurrence: Grecian Rocks, Key Largo, Florida

How to recognize this animal

A boulder-like or encrusting colony with broad, winding valleys. Walls can be brown or gray, with matching or green valley floors; finely toothed septa and a narrow groove along wall tops are useful close-view clues.

Sources: Species biology and identification reference

Size and life stages

Colonies can be large and rounded, but a reliable maximum diameter was not established in the selected account. Coral diameter is not fish-style body length, so the size filter stays unassigned.

Sources: Species biology and identification reference

Habitat and where to look

A shallow-reef coral. Look at colony contours and valley patterns from above without resting on the reef.

Sources: Species biology and identification reference

Range and local context

A Florida DEP survey documented this species at Grecian Rocks, Key Largo, on 16 July 2016. Present survival and abundance are not established by that historical record.

Sources: Local occurrence: Grecian Rocks, Key Largo, Florida

What is on the menu?

Coral polyps capture small prey; symbiotic algae also supply nutrition. This general reef-coral context does not establish a local prey list.

Sources: NOAA coral biology; NOAA coral biology

Daily habits and behavior

The species account describes tentacles extending at night. A daytime view therefore shows a different surface texture from an expanded nighttime colony.

Sources: Species biology and identification reference

Mating and the next generation

NOAA recorded spawning observations and gamete collection for this species in September 2025. That study year is not a guaranteed annual date for Grecian Rocks.

Sources: NOAA 2025 spawning report

Look-alikes and identification traps

Manicina areolata can resemble it. Traditional Diploria brain corals have smaller valleys and finer skeletal structures; a distant silhouette alone is not enough.

Sources: Species biology and identification reference

Observe without disturbing

Keep fins and equipment clear; photograph without touching or disturbing the colony or nearby sediment.

Sources: NOAA responsible diving

Harvest, protection and eating safety

Protected: no recreational take

Verified coral harvest prohibition, not a seasonal closure. Special scientific permits are not recreational permission.

This color is a qualified summary, not permission to collect or a guarantee that a particular animal is safe to eat.

Can it be hunted or harvested?

This species is a stony coral (Scleractinia), for which FWC prohibits harvest. Leave the colony and fragments in place; do not collect, damage or remove.

Florida seasons and areas

No recreational open season. Florida coral prohibitions apply to state and adjacent federal harvest; sanctuary and park protections also apply. Check mapped boundaries before any take. Blue Heron Bridge prohibits marine-life collection within the designated dive-site area, not all county fishing. Biscayne prohibits ornamental collection without a superintendent permit and has a mapped March 1–May 31 fishing/possession closure, effective March 2026, with properly stowed continuous transit excepted. Pennekamp prohibits tropical-fish collection and spearfishing. Key Largo Management Area prohibits taking tropical fish and marine invertebrates; the latter exceptions are commercial spiny-lobster/stone-crab trapping and recreational spiny-lobster hand/hand-gear take under applicable rules, not recreational crab collection. It separately prohibits spearfishing. Sanctuary Preservation Areas prohibit fishing and collection subject only to expressly stated exceptions. These are site restrictions, not a corridor-wide fishing ban.

Can it be speared?

Do not spear, damage or remove this coral. Protected-site rules provide additional restrictions.

Is it safe to eat?

No species/site-specific food-safety clearance or meal frequency was established. Legal harvest does not mean safe to eat; some marine toxins survive cooking and freezing. Consult current Florida Health guidance and local advisories. No dated, species-matched local menu evidence was verified; recipes remain disabled.

This species is a stony coral (Scleractinia), for which FWC prohibits harvest.

This review covers the Vero Beach–Key Largo Atlantic corridor: Indian River, St. Lucie, Martin, Palm Beach, Broward, Miami-Dade and Monroe counties. Florida Atlantic state waters and South Atlantic federal waters are distinct jurisdictions. Do not extend a state-water season tag to federal waters or transfer Atlantic rules to Gulf-side Keys waters. Park and sanctuary boundaries can override a species allowance.

Before you act: Confirm the species, date, exact management area, state or federal waters, gear, licenses and current local closures. A local occurrence record never grants permission to take an animal.

Official rules and health guidance

Reviewed 2026-11-11. Rules and advisories can change; check the linked authorities before acting.

Identification and source cautions

A historical record does not establish current colony survival or abundance.
Color and growth form can vary; illustrative field clues are not a complete taxonomic key.
Colony width, height and reproductive size are not interchangeable with fish-style body length.
Legal and image review remain separate publication gates.

Sources and review

Biology and taxonomy reviewed 2026-11-11. Photographs on cited sites are reference material and are not reproduced here.

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