If he has no diseases, spring is coming soon. I assume that he can catch live food since he was wild caught . When the weather warms up a bit consider putting him back, as long as he is healthy since he is native species, i dont see a problem, just make sure that it is fishing season for bull heads if you do that, dont want fish and wildlife to give you a fine for taking fish out of season. I would bring a pole with you just incase, that way if you are seen dumping him and they tried to say something, or said you illegal dumped a non native fish, you can say you caught him and just changed your mind about keeping him and were dropping him off on your way home lol. He would probably like that best anyway.

