I have an adult Valley garter snake Thamnophis sirtalis fitchi. I have had this snake since the spring of 2011 as an adult from the wild. He has been eating fine since I have had him on silverside fish and pinky mice roughly twice a week. This past month he has stopped eating completely and acts very agitated when his cage is accessed. Any thoughts would help and let me know if there is more information that I can provide.

Thanks!