Thanks to WWMT for this:

LEELANAU COUNTY, Mich., (WPBN/WGTU) — The battle against invasive species is something just about every lake association in northern Michigan has to deal with.

But one of the most popular, famous and beautiful lakes in Leelanau County is dealing with something kind of unique and is responding in a rather unique way.

“It’s a pristine spring-fed lake here in northern Michigan; looks like the Caribbean and there’s no better place to be,” said Conor McCahill.

As the owner of Glen Craft Marina and Resort, McCahill benefits from keeping Glen Lake pristine and healthy.

Glen Lake Koi (photo by Tom Riparian)

In May and June, a bowfishing team from Thundering Aspens Sportsman Club in Mesick removed four large koi, including a 32-inch, 24.5-pound pre-spawn female which the association says set a world record for Japanese koi harvested with a bow.

Beyond that, the association thinks a major impact to the lake was avoided because three of the four koi removed were pregnant and one was a male was filled with milt (sperm).

“The combination was there for fertilization and spreading,” said Rob Karner, watershed biologist for the association.

Japanese koi are a type of carp frequently found in ornamental ponds. Biologists consider them an invasive nuisance when released to certain ecosystems because they live long, reproduce readily, survive harsh winters and have a big appetite.

Koi and goldfish, another ornamental carp sometimes released to the wild, are known for digging along stream and lake beds — uprooting plants and fighting native fish for food.

The 4,800-acre lake is stocked with lake trout and rainbow trout. Other native species include northern pike, cisco, bluegill, sunfish, largemouth and smallmouth bass

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