I went to the United States Patent and Trademark Office web site and looked for Minnesota Fishing and registration number 29748 and found nothing.
Here's the URL:
http://www.uspto.gov/main/trademarks.htm
This doesn't mean that I am counseling you in any way.
I KNOW it's not a Federal Trademark, he MAY have a STATE trademark in Minnesota for "Minnesota Fishing", does this cross State lines?