Atlantic Calico Scallop

The Atlantic calico scallop, Argopecten gibbus, has a rounded, ribbed shell with small hinge projections. Its upper valve often carries a patchwork of pink, red, orange or brown markings. That variable pattern helps explain the name, but shell shape, ribbing and habitat should be considered together rather than relying on one attractive color combination.

Offshore Florida context

FWC documents calico scallops in deeper waters along both Florida coasts. The well-studied Cape Canaveral bed provides direct east-coast evidence, while the wider distribution includes Florida’s Atlantic coastal waters. This is an offshore sandy- or shelly-bottom species, not the shallow seagrass scallop familiar from recreational bay-scalloping trips.

For a Vero Beach–Key Largo directory, identify the habitat honestly and do not translate a broad range into a promised sighting at a named reef. Deep-water records are ecological information, not encouragement to exceed training, equipment or dive-plan limits. A beach-worn valve also does not establish a living scallop bed at that beach.

Feeding and movement

Calico scallops filter food particles from water passing across their gills. Unlike an attached adult oyster, a scallop can move by rapidly closing its valves and expelling water. Small blue eyes around the mantle edge detect changes such as shadows and movement. Do not provoke repeated swimming for a video.

Reproduction and early life

Adults possess both male and female reproductive organs and release reproductive cells into the water. After a planktonic larval period, young scallops settle and attach to hard material, which can include older scallop shells. FWC describes rapid growth and early reproductive maturity, allowing different size groups to occur in the same bed.

Lookalikes

Calico and bay scallops are related but differ importantly in their usual habitat and shell pattern. A small patterned scallop is not automatically a bay scallop, and a recreational bay-scallop season is not a general season for every scallop species. Photograph the full valve shape and hinge area when possible, using an undisturbed animal or an already empty shell.

Observe and record

Note the bottom type, depth and whether the specimen was alive in place. These details improve the usefulness of a record more than a close-up without context. Keep the animal on its natural bottom and avoid disturbing neighboring shells or sediment.

Before collecting, check current rules for the actual species, waterbody and protected area. General shellfish guidance and bay-scallop regulations cannot be treated as interchangeable. This page is an identification resource and provides no independent harvest authorization.

References

• National Shell Museum identification reference
• FWC species information
• FWC: Calico scallops on both Florida coasts
• Research: Cape Canaveral calico-scallop abundance
• FWC: Current recreational saltwater rules

Collection and shellfish safety

Calico scallops are not bay scallops: do not apply a bay-scalloping season or bag limit by analogy. Before any collection, verify species-specific FWC guidance, licenses and local access restrictions. This offshore species profile is not harvest permission or seafood-safety clearance. FWC live-shell collection guidance and FWC hard-clam and oyster rules. Official guidance reviewed November 12, 2026; no location-specific harvest or sanitation clearance is given.

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