I just feel the need to point out that on this forum, if someone posts a picture of a camp scene with out a fire blanket under the pan, people will chastise to no end, but every time the invasive species concept comes up, the general sentiment seems to be that folks just don't care. Time for all the "river environmentalists" to check their priories. One species translocation does irreparable harm forever, or at least until society embraces CRISPR deleterious gene drives. Fire rings, litter, and pissing on the beach are all utterly insignificant in comparison.
The bottom line is, if your boat holds onto water in between trips, you need to figure some thing out. Get it clean and dry or rinse with scalding hot water. Most state wildlife agencies have decontamination stations where you can get your boat dowsed with hot water. I bet that tilting your boat up and running a hotsy through the floor would do the trick.
We also have a responisbility to try to keep our gear clean of mud, dirt, and organic material that might contain unwanted plant seeds and encourage our governments to stop stocking invasive fishes.