The Wisconsin Department of Natural Resources is asking for your help monitoring a large-scale die-off of fish in the Fox River that has reached southern Door County. The origin of the die-off is unknown and was first reported on June 20. Many dead fish have been found downstream of the De Pere Dam and in the Bay of Green Bay. The DNR says that it appears most of the species impacted are catfish, carp, and sheepshead. Testing of the waters and fish continues with authorities asking the public to immediately contact the DNR if they find either dead or freshly dead fish. The DNR recommends that you do not handle dead or diseased fish and to contact Green Bay Area Fisheries Biologist Jason Breeggemann at Jason.breeggemann@wisconsin.gov or call (920) 662-5480.