I don't know if they are threadfin or gizzard or both. I do know there are a ton of them and they eat them 24-7 365! There is an unbelievable amount of forage in this lake. If they would lower the limit and personally I would like the length limit to be 12 inches, then you would have a tremendous fishery. We have too many out of state fisherman taking too many fish home. A friend of mine and a CDC member ran into some Ky. guys the other day who told him they had to get enough fish to feed 500 people at there church fish fry. He wanted to know why they didn't catch them in Kentucky. I wondered the same thing.