Every morning on Marco, people walk the sand in front of the resorts looking for shells and find fragments. Then they conclude the island is not a shelling destination.
It is, but the geography works differently here than it does on the barrier islands north of us. Marco sits at the head of the Ten Thousand Islands, where a broad shallow shelf, a chain of oyster bars and a series of tidal passes sort shell material and dump it in places that have no roads to them. The beach in front of a five-hundred-room resort is combed by a hundred people before breakfast. The beach on a key nobody lives on is not combed at all.
So the honest answer is that Marco's shelling is earned by boat, by tide, or by both.
First, the rule
Collier County permits the collection of empty shells only. Live shells, live sand dollars and live starfish stay where they are. That is not a guideline.
Telling live from empty
It is easier than people think:
- A living gastropod — a fighting conch, a whelk, a tulip — has an operculum, a hard trapdoor sealing the opening. If you see it, put the shell back in the water the right way up.
- A live sand dollar is brown or purplish and velvety, and the spines move if you look closely. A dead one is white, smooth and rigid. The white ones are the ones you keep.
- A live starfish is firm, coloured and slowly mobile. Lifting one out of the water to photograph it can kill it.
- If it smells of nothing, it is empty. If it smells, it is either alive or recently dead, and either way it does not belong in a suitcase.
Rules also change with jurisdiction out in the islands. Collecting is not permitted inside Everglades National Park, and the wildlife refuge has its own restrictions. If you are on a charter, ask the captain whose water you are standing on before you start filling a bag.
Where the shells are
| Where | How you get there | What tends to turn up | Effort |
|---|---|---|---|
| Tigertail flats and Sand Dollar Island | Wade the lagoon at low tide | Sand dollars, olives, coquinas, small whelks, augers | Low, tide-dependent |
| South Marco wrack line | County lot on Swallow Avenue | Coquinas, cockles, fragments, the occasional good fighting conch | Low, competitive |
| Kice Island and Morgan Beach | Boat, 15–25 minutes south | Fighting conchs, lightning whelks, tulips, horse conch pieces | Needs a boat or a charter |
| Cape Romano shoals | Boat, 25–40 minutes south | Whelks, murex, larger material after a blow | Needs a boat |
| Keewaydin Island | Boat, 20–30 minutes north | Mixed beach shelling along eight miles of undeveloped sand | Needs a boat |
Dedicated shelling charters run from the island and from Goodland, and for most visitors that is the sensible way to do this. You are paying for somebody who knows which key got scoured by the last front and which one is holding material this week, and that knowledge changes month to month.
The two-hour window
Shelling here is governed by the tide far more than by luck.
Go on a falling tide, arriving about an hour before low water, and work the strip that has just been uncovered. That band is where the water sorted the material and then walked away from it. By an hour after low the good stuff has been picked over or the tide is back.
Weather beats the calendar
Two multipliers. The first is a strong low — the bigger tidal ranges around the new and full moon uncover flats that ordinary tides never expose. The second is weather. A winter cold front with a day or two of hard northwest wind pushes material onto these beaches, and the morning after a blow is the best shelling on this coast. Local collectors watch the forecast, not the calendar.
Summer mornings after a strong thunderstorm can do something similar on a smaller scale.
What you are likely to find
The southwest Florida shelf produces a long species list. On Marco's beaches and the outer keys the common finds are Florida fighting conchs, lightning whelks with their left-handed opening, lettered olives, coquinas in a dozen colour combinations, cockles, augers, pen shells and sand dollars on the flats.
The prizes are horse conchs, Florida's state shell and the largest gastropod in American waters, usually found as juveniles or as worn adult fragments; true tulips and banded tulips; apple murex; and, very occasionally, a junonia, which is the shell that makes people photograph their hands. Nobody finds a junonia on schedule. Treat a whole one as a story rather than a plan.
You will also pick up a great many oyster and pen shell fragments, because this is an estuary and that is what estuaries make.
Doing it well
Bring a mesh bag so sand and water drain out of it, rather than a bucket that gets heavy. Water shoes, because the flats hold shell fragments and the occasional live urchin. A hat, and more sun protection than the hour suggests, since a low-tide flat reflects hard.
Walk slowly and look at the edge of the water rather than at the dry sand. Most of the good material is sitting in an inch of moving water where it does not look like a shell until it rolls.
Do not dig. Trenching the flats destroys the invertebrate life that the shorebirds are feeding on, and on the Tigertail flats it is the reason the birds are there at all. Walk around every roped and posted area; shorebirds nest on open sand and abandon nests when people cross them.
Take what you will actually keep. A bag of broken cockles becomes rubbish in a hotel room.
How this differs from the shelling islands north of here
Visitors often arrive having read about Sanibel and Captiva, an hour and a half up the coast. Those islands sit on an east-west axis that acts as a catcher's mitt for shells coming in on the current, and shelling there is a walking activity you can do from a bicycle.
Marco is not that, and pretending otherwise leads to disappointment. What Marco has instead is access: within half an hour of the island's docks there are uninhabited keys with no footprints on them, and on a good tide after a front you will find material there that a Gulf-front beach with a resort behind it simply never keeps.
Different proposition, same obsession. Bring the mesh bag either way.
Getting them home without the smell
The classic mistake is packing a shell that still has something in it. The suitcase discovers this before you do.
Soak empty shells in fresh water for a day, changing the water once, then scrub gently with an old toothbrush. Stubborn calcium deposits give way to a longer soak, not to force; a wire brush ruins the surface you collected the shell for.
Some collectors use a diluted bleach solution to clean the outside. It removes the periostracum, the natural brown outer layer, which purists consider vandalism and most people consider tidy. Rinse thoroughly afterwards either way.
Sand dollars are brittle. Rinse, dry slowly out of direct sun, and pack them in a rigid container rather than in a shoe. If you want them to survive the flight, that container is the whole trick.
Do not put shells in checked luggage loose. Do not attempt to clean anything that was alive when you picked it up, because it should not have been picked up.
Last updated
Opening hours, ordinances and prices move with the season. We re-check this guide rather than rewrite it, and the date above is the last time someone did. How we research and correct.
