© 2022 WXPR
Mirror of the Northwoods. Window on the World.
Play Live Radio
Next Up:
0:00
0:00
Available On Air Stations
Local News

Sex Ratio Skewed in Some Hatchery Raised Walleye

Walleye.jpg
Wisconsin DNR Facebook
/

The Wisconsin Department of Natural Resources wants to figure out why some hatcheries produce more female walleyes than males.

The DNR conducted a preliminary analysis of hatchery-reared extended growth walleye sex ratios in 2019.

That led to more in-depth research in the fall of 2020, including additional walleye from both the Art Oehmke hatchery in Woodruff and Governor Thompson fish hatchery in Spooner.

These preliminary investigations indicated hatchery-reared extended growth walleye showed sex ratios favoring females.

Surveys of naturally reproduced walleye generally show sex ratios closer to a one-to-one male to female or ratios skewed towards males.

Currently, there is no evidence to suggest that skewed sex ratios exist in other hatchery-reared species. 

Now, the DNR will do more work to better understand the issue.

It is unknown whether an uneven sex ratio exists in hatchery-reared fry or small fingerling walleye.

The DNR will also be looking into that.