Oxytetracycline (OTC) Markers
No Reporting Needed
Anglers will not be able to determine if a fish has been marked with Chemical Markers - OTC. Typically this marking procedure is used to identify hatchery versus naturally-reproduced fish. OTC samples are collected by agency personnel.
Additional Information about Chemical Markers:
- Analysis of Chinook Salmon Populations of Lakes Huron and Michigan, 1985-2004
OTC marks were used to determine natural reproduction of chinook salmon in both lakes Huron and Michigan.
- Status of Saginaw Bay Walleye Population and Progress Towards Recovery
Due to the stocking of OTC-marked fish, it was determined that the strong year classes of the last few years are wild (or naturally reproduced) walleye.