The Boat Gets Rinsed. The Decoy Bag Is What Moves the Invaders.

Texas boaters have had the clean, drain, dry speech for years, and most of them can recite it. What the Texas Parks and Wildlife Department did on Oct. 29 was narrower and more useful: it pointed out that the hull is not the part of a duck hunter's kit that quietly relocates a lake.

Decoys hold water. So do decoy bags, waders, boot treads, marsh sleds, and the space between a boat and its bunks. Aquatic plants and mussel larvae ride in all of it, and a waterfowl hunter who hunts one lake on Saturday and a different one the following weekend is a dispersal route with a trailer hitch.

The stakes are specific. Giant salvinia, a free-floating aquatic fern that can double its coverage area in a week, is now present on 30 East Texas lakes plus numerous rivers, creeks and marshes, largely in the corridor between Houston and Beaumont. A single fragment is enough to start an infestation, and the mats it forms do more than block a boat ramp. Jessica Metz, an aquatic habitat enhancement biologist with TPWD, put the hunting case plainly: the plant "can not only form thick mats that block hunters' access to prime waterfowl hunting areas but also outgrow and replace the native plants that waterfowl rely on for food and high-quality habitat."

Zebra mussels are the other half of the problem, and in some ways the harder one. TPWD counts them in 40 Texas lakes across eight river basins, plus river reaches downstream of infested lakes, and the department monitors at-risk water for early detection of zebra and quagga mussels. Once a lake is infested, control is not really on the table — the work becomes mitigating damage to water supply and control infrastructure. Monica McGarrity, TPWD's senior scientist for aquatic invasive species, noted the part hunters tend to miss: mussel larvae are microscopic and can travel in residual water left in a boat or pooled in a decoy, so a gear inspection that looks clean can still be carrying them.

The department's gear advice comes from recent studies rather than habit. Remove plants by hand or with a wet/dry vacuum before rinsing, because a hose pushes fragments into places a hand cannot reach — around lights, behind license plates, between the hull and the bunks. Rinse waders and decoys after the plants and mud are off, and use a stiff brush on boot treads, which are effectively a seed bank with laces. Drain decoys, and consider adding drain holes to older cracked ones that hold water and plant fragments by design.

None of this is purely advisory. Transporting a prohibited aquatic invasive species in Texas is illegal and carries a fine of up to $500 per violation. Boaters are also required to drain all water from the boat and onboard receptacles, bait buckets included, before leaving or approaching a body of fresh water, and to remove all invasive plants from the boat, trailer, towing or launching vehicle and equipment before pulling out of a lake.

The reporting channel matters for early detection. TPWD asks anyone who finds an invasive species on a lake where it has not been reported, or spots plants or mussels on a boat or trailer being moved, to call (512) 389-4848 or email photos and location details to aquaticinvasives@tpwd.texas.gov.

There is an industry logic underneath the request that goes beyond hunter convenience. Eradication is not a realistic tool for either species once established, which means every new lake is a permanent cost — to water districts, to ramp access, to the submerged vegetation that holds ducks in a bay. The only cheap intervention left is the ten minutes at the ramp, and the part of the truck most hunters never think to check: the bag the decoys came out of.

For the pest management trade, the parallel is not subtle. Salvinia and zebra mussels are the aquatic version of the structural argument that exclusion beats treatment, except here the exclusion happens on a concrete ramp with a wet/dry vac and a brush, and the alternative is a lake nobody can launch a boat on.