Smalltooth Sawfish: The Ten Thousand Islands’ Rarest Fish

What Is a Smalltooth Sawfish?

Despite the shark-like silhouette, a smalltooth sawfish is actually a ray, not a shark: its gill slits sit on the underside of a flattened body, and its closest relatives are guitarfish and skates, not great whites or bull sharks. Its signature feature is the rostrum, a long, flat blade lined on both edges with dozens of sharp rostral teeth, which aren’t true teeth at all but modified scales, more like a hard-edged extension of its skin than a jaw. The sawfish swings that rostrum side to side through schools of small fish and shrimp, using electroreceptors along its length to sense prey buried in the mud, then stunning and pinning it before eating it off the bottom. Adults can reach 16 to 18 feet including that rostrum, making it one of the largest fish that swims the Gulf of Mexico, though the animals you’re most likely to encounter in the Ten Thousand Islands are juveniles well under half that length, tucked into shallow mangrove shorelines where they’ll spend their first several years.

Sawfish are slow, deliberate swimmers that favor low light: dawn, dusk, and cloudy, tannic-stained water over the open, sunny flats other rays prefer. They don’t hunt by sight the way a dolphin or shark does; a sawfish reads the electrical field every living creature gives off, which is part of why an encounter often happens close, quiet, and by surprise, rather than as a chase across open water.

Why It Nearly Disappeared

The smalltooth sawfish once ranged from New York down through the Gulf of Mexico to Texas, but that range has collapsed by more than 95 percent from historic levels. The rostrum itself is the problem: it snags in almost any net, so the species suffered heavy bycatch losses even in fisheries that were never targeting it. Shoreline development and dredging wiped out mangrove nursery habitat up and down its range over the twentieth century, and because sawfish mature slowly, carry pups for roughly a year, and produce only a handful at a time, the population couldn’t rebound fast enough to keep pace with those losses. By the late 1990s, Southwest Florida held nearly the entire known U.S. population, and in 2003 the smalltooth sawfish became the first marine fish ever added to the U.S. Endangered Species Act. It’s now illegal to target, harass, or keep one for any reason — any incidental catch has to go straight back into the water, no exceptions.

Why the Ten Thousand Islands Are Critical Habitat

Juvenile sawfish need very specific nursery conditions: water only a foot or two deep, red mangrove prop roots to hide from bull sharks and other predators, and current lines where small prey collects. That’s exactly what our mangrove ecosystem still offers in abundance, which is why NOAA Fisheries designated a stretch of the Ten Thousand Islands and Everglades estuary as one of only a handful of federally protected critical habitat zones in the country built specifically for juvenile smalltooth sawfish. Researchers have spent years netting, tagging, and tracking young sawfish in these exact backwaters to understand how they use the mangroves as they grow, and that ongoing work is part of why the species’ status here gets watched so closely.

That’s a rare distinction, and it’s part of why a run through this backcountry on a Ten Thousand Islands charter feels different than most Florida coastline trips. You’re not just sightseeing — you’re moving through one of the last places on the planet where a fish that fell to a few hundred known individuals is slowly rebuilding its numbers, mangrove shoreline by mangrove shoreline, tide by tide.

Federal recovery plans for the smalltooth sawfish set goals measured in decades, not years, but the early signs out of Southwest Florida are encouraging: more juveniles have been documented in nursery surveys across the Ten Thousand Islands and Charlotte Harbor area in recent years than in the decades right after the 2003 listing. Nobody is calling the species recovered, and a sighting should never be treated as a sure thing on any given trip, but the trend line for a fish that was once nearly fished out of American waters is finally pointing the right direction. That slow, patient comeback is exactly the kind of story these islands are full of, right alongside the return of ospreys, manatees, and other species that struggled through the same era of coastal development.

Sawfish vs. Other Toothy Gulf Species

With that saw-like snout, it’s easy to lump a sawfish in with sharks, or confuse it with a stingray, a cownose ray, or the smaller Atlantic guitarfish that share these same flats and backwaters. Each one behaves, and looks, differently up close, and knowing the difference matters for both safety and for reporting an honest sighting.

Unlike a bull shark, which is a bold, common predator in these same channels, the smalltooth sawfish is shy, bottom-oriented, and rarely seen at all — its rarity, not its size, is what makes an encounter memorable, and it’s part of why we never promise one on any tour.

If You Hook or See One

Because it’s federally endangered, targeting a smalltooth sawfish is illegal, and if one ever takes bait by accident on a fishing trip, the rule is simple: don’t lift it out of the water, don’t handle it by the rostrum, and cut the line as close to the hook as you safely can so it swims free on its own. Note the time, location, and approximate size, then report the sighting to FWC — every reported encounter in the Ten Thousand Islands helps biologists track how this species is recovering. On our fishing charters and every dolphin and wildlife tour we run, we treat a possible sawfish encounter the same way we treat a manatee or dolphin sighting out here: something to watch respectfully from a distance, worth a story either way it goes, and never something you touch or promise a guest in advance. Explore the rest of our Wildlife Guide for the other real species sharing these same waters.