That is pretty tragic when you see the plecos actually on the manatees. Manatees are just one of those evolutionary niche creatures that are vulnerable to so many things that have entered their environment.
Besides invasives putting pressure on native species, the number of invasive species impacting our food supply is pretty scary as well. I grow various edibles in the yard and attacks on them by invasive bugs seems to go up every year - japanese beetles, stink bugs, oriental fruit moth, spotted wing drosophila and even bugs that have been imported from other areas of the US like plum curculio. The spotted lanternfly is already a few counties away and there are others as well. But at least we don't have wild hogs yet!