Ouch I saw that picture of that grass carp. If it was caught in south florida it was probably put into the water by city. Triploid grass carp are used to control exotic plants, so they won't take over the water and make it completely unfishable. I think you can get fined for keeping one of those, but i'm not 100% sure. I know that they are sterile because they were engineered with 3 sets of chromosomes (3n) hence the triploid part, and that's so the carp don't reproduce and take over the waters and destroying the habitats of natural florida species. Well that's a bit of info off the top of my head, I feel like the bad news bearer.