The State of Wisconsin Department of Natural Resources has tagged a 125-year-old sturgeon (above) that is the largest on record in Wisconsin.
Officials found the 7-foot-3-inch long, 240-pound female sturgeon in the Wolf River near Shawano, earlier this week, said DNR sturgeon biologist Ron Bruch. He estimated the fish was born around 1887, when Grover Cleveland was president.
How can they tell it is 125 years old? The biologists count growth “rings” on scales, and/or ringlike structures found in otoliths (small bones of the inner ear).
Closeup of a Chaosarou?