i fish hard;

There could be a number of reasons for the red spots in the mouths of the fish you are catching. Most likely, it is a bacterial or fungal infection, probably early stage. Another possibility is a parasitic infection. If not the above, it could be some type of injury from eating prey that has sharp spines, such as a bluegill, or a carapace, such as a crawfish. To actually determine the cause of the anomaly, the fish need to be examined by a biologist trained in diagnosing fish diseases and parasites. It is not easy to determine causes of such problems just from a word description, and frequently, photos do not adequately capture the anomaly to provide a certain diagnosis. Wish I could be of more assistance.

Gary