They tag some crappies and walleye also I think here in the state of Kansas. If you catch one with a tag you are supposed to remove it and send it in to the Parks and Wildlife department with a detailed description of it's size, location, bait, etc. In return they will send you a t-shirt, coozy, bait, or something. There are a few however that can make you some $$$$. I think they color code the tags each year and if you catch ones with a certain color you can get upwards of $500. I wouldn't be to mad if I accidentally caught that crappie while bass fishing.