Fish identification archive / Nine-armed Sea Star

Nine-armed Sea Star

Luidia senegalensis

Fun facts for your next surface interval

Five is not the rule here: nine arms are the usual arrangement.
A shellfish fan: bivalves dominated the stomach contents in a published Brazilian feeding study.
Local photo opportunity, not a promise: this species has been photographed at Blue Heron Bridge.

Florida and local context

Blue Heron Bridge, Palm Beach County: Florent’s published species photograph is explicitly labeled Blue Heron Bridge, Florida. This is an individual photographic occurrence record, not an abundance estimate.

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

Count the arms while looking for a modest central disc and long, slender, tapering rays. Nine is the usual number, although damaged or unusual individuals can complicate counting. The upper surface is generally bluish-gray or greenish-gray, with a pale underside and narrow marginal spines. Tiny closely packed skeletal projections give the back its granular rather than smooth appearance.

Size and life stages

The NOAA-hosted identification account reports adult arm lengths commonly around twelve and a half to fifteen centimeters, approximately five to six inches, with larger examples reported. That is an individual arm measurement, not the animal’s full tip-to-tip diameter. Photographs can greatly exaggerate size when the nearest arm is close to the camera, so include an unobtrusive scale reference when available.

Habitat and where to look

Sandy and sandy-mud bottoms are the main habitat clues. Its long arms lie over or partly within sediment rather than clinging high on a coral head. The published depth range extends from the shore to about forty-six meters. Much of that range exceeds an appropriate dive for some visitors; use the habitat information without treating depth limits as a dive recommendation.

Range and local context

Florida occurrence is documented in the NOAA account and museum specimens. Florent’s photo record specifically labels a nine-armed sea star at Blue Heron Bridge, strengthening its relevance to Palm Beach divers. The broader range extends through the Antilles and western Atlantic South America. A dated photograph confirms occurrence, not permanent occupancy at the photographed spot.

What is on the menu?

This is a predator of small bottom-dwelling animals, not merely a passive sand ornament. A Brazilian stomach-content study found bivalve mollusks especially prominent, along with other prey. That result identifies a feeding strategy but does not establish the exact proportions eaten in Florida. Do not assume all sea stars feed by the same visibly everted-stomach technique.

Daily habits and behavior

Its broad spread of slender arms is well suited to moving over soft bottom and searching sediment. Partially buried arms can make the animal appear to have fewer than nine rays. Watch before deciding that an arm is missing. The top surface’s little skeletal projections and marginal spines are useful close-up details, but turning it over is unnecessary.

Mating and the next generation

Researchers have studied an annual reproductive cycle in populations off southwest Florida, using gonads and digestive-gland tissues to track energy allocation. The older identification account did not establish a spawning schedule. Neither source justifies advertising a reliable Palm Beach spawning month. Avoid describing a gathering or an oddly positioned arm as courtship without direct supporting behavior.

Look-alikes and identification traps

The gray sea star, Luidia clathrata, has similar subdued coloration but normally five arms. Brittle stars have arms much more sharply separated from a distinct disc and a different segmented appearance. A cushion sea star is far thicker and usually five-armed. In a damaged specimen, use several characters and retain uncertainty rather than relying entirely on counting.

Observe without disturbing

Never lift it by an arm or take it into the air for a photograph. Keep buoyancy and fins clear of fine sediment so the animal and nearby observers are not covered in a cloud. Leave partly buried individuals undisturbed. Within Blue Heron Bridge’s protected dive-site boundary, marine-life collection is prohibited; record the sighting instead.

Harvest, protection and eating safety

LIVE COLLECTION ONLY — NO FOOD HARVEST

Florida state and adjacent federal waters: limited licensed live collection may be lawful, with live landing/holding, life support, species size rules and bag/possession limits. No species-specific annual closed months are listed, but Blue Heron Bridge, Biscayne and other area closures override that allowance. This is not a blanket ban on lawful live collection or an eating recommendation. Lee prohibits harvest and coastal-water possession; Manatee limits harvest and coastal-water possession to two per species.

This color is a qualified summary, not permission to collect or a guarantee that a particular catch is safe to eat. Read the current rules and health guidance below.

Conditional live collection; marine-life rules

Can it be hunted or harvested?

Nine-armed Sea Star falls within FWC’s regulated marine-life group for starfish, Asteroidea. Recreational collection requires a Florida saltwater fishing license unless a statutory exemption applies. The daily limit is five of this species within twenty total marine-life organisms per person; two-day possession is ten of this species within forty total. No species-specific size limit is listed. Animals must be landed and kept alive with an adequately sized circulating livewell, aeration or oxygenation system. Recreationally collected marine life cannot be sold.

Florida seasons and areas

No species-specific annual closed season is listed, but this is not permission to collect everywhere. Florida marine-life rules also apply in adjacent federal waters on both the Atlantic and Gulf coasts. Collection is prohibited within the designated Blue Heron Bridge dive-site boundary and throughout Biscayne National Park. Other parks, refuges and Florida Keys sanctuary zones may prohibit collection. Western Dry Rocks is closed to all fishing April 1–July 31. Lee County prohibits harvest of these living mollusks or echinoderms and prohibits possession in or on county Florida waters seaward of mean high water. Manatee County allows no more than two of this species harvested per day and no more than two in possession in or on county Florida waters seaward of mean high water. These local restrictions override the general ten-specimen marine-life possession allowance.

Can it be speared?

No. Recreational marine-life harvest is restricted to authorized non-spearing methods, including hand collection and the listed handheld, drop or barrier nets and slurp gun. A spear is not an authorized collection method; quinaldine is prohibited. The live-landing and live-holding requirements still apply.

Is it safe to eat?

Not presented as a recreational food target. Florida’s marine-life rules require these animals to be landed and kept alive, and an aquarium-collection allowance is not a food-safety finding. No species-specific Florida consumption assessment is established here. Do not infer edibility or safety from the absence of an advisory or from another related species being eaten.

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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