Your fishing license expires on March 31.  Your ORV sticker expires on this day as well.

Be sure to check out some of the new regs in the 2011 Michigan Fishing Guide.  There are several changes but perhaps the most noteworthy impacting us would be the possession limit change:

In addition to one (1) day's daily possession limit of fish, a person may possess an additional two (2) daily possession limits of fish taken during previous fishing days provided that the additional limits of fish are processed (canned, cured by smoking or drying, or frozen).