Invasive goldfish population spikes in Chaska chain of lakes

Goldfish aren't good for Minnesota's waterways.
Publish date:
Screen Shot 2019-04-20 at 9.13.40 AM

Thousands of goldfish have been found in Chaska-area lakes and it's quite the problem. 

The fish were found by Carver County Water Management Organization during a routine inspection Tuesday at Big Woods Lake, which it described as a "goldfish infested pond." The Star Tribune reports their likely numbers are in the thousands.

"Despite being a popular pet, they are an invasive species when released into the wild with no natural predators. Please keep them in your tanks and out of our lakes!" the water management group said

The goldfish were found in an inlet channel around the Grace Chain of Lakes in Chaska. Staffers spotted the fish last year, but "the numbers have grown significantly" and they suspect the goldfish have spread to other lakes in the chain, which includes Lake Grace, McKnight Lake, Lake Jonathan, Big Woods Lake and Lake Hazeltine.

"Goldfish are an invasive species, related to common carp, that are known to cause water quality issues," says Carver County Water Management Organization. "We do not want these species to spread to other lakes and streams." 

Follow Bring Me The News on Flipboard for the latest stories

How'd the goldfish get there? The answer isn't certain, but it's likely that someone with goldfish as a pet put them in a lake.  

Female goldfish can lay thousands of eggs at a time, which can lead to fast population growth like what's being seen in Chaska. 

It is illegal in Minnesota to transport live goldfish out of state waterways. Anglers can fish for them with a hook and line, but they have to be dead to be transported. Transporting them while they're alive increases the risk of the invasive species spreading. 

Next Up

boys volleyball

Girls wrestling sanctioned as MSHSL activity; boys volleyball 2 votes shy

There will be section and state tournaments for girls-only wrestling next school year.

P.J. Fleck

Gopher players defend PJ Fleck after WCCO-TV report

"The public has made our statement," a U of M spokesperson said.

vaccine, covid

Twin Cities police investigating COVID vaccine thefts in viral videos

Videos of both incidents were recorded and shared online.

Guthrie theater

Guthrie to reopen to the public in July, shows resume this fall

The theater has been closed to the public for more than a year.

Target - good and gather plant based

Target is launching more than 30 new plant-based grocery products

All are part of the company's hit Good & Gather brand.

Roller Garden

Roller Garden to auction off skates, signs, arcade games and more

Many items from the beloved Roller Garden will be up for auction next month.

joseph ness booking photo

Charges: Chanhassen man fired hundreds of rounds, killing his sister

Six rifles, including AR-15 and AK-47 variants, were found inside the home.

police lights

Woman robbed and assaulted at gunpoint in Waite Park, police say

The incident occurred on Sunday at around 11:30 p.m.

pixabay - marijuana cannabis

Marijuana legalization: Minnesota House to vote Thursday

The "historic" vote on the House floor is set for Thursday afternoon.


Screen Shot 2020-11-03 at 9.15.02 AM

Carver County removes as many as 50,000 goldfish from local waters

The county started tracking the invasive species over the spring.

Chaska man killed in snowmobile crash in northern Minnesota

The snowmobiler tried to cross Hwy. 169 and was struck by a vehicle.

List of waterways with invasive species grows

Just in time for Minnesota's warm-weather boating season, state conservation officials Thursday released a list of waterways newly discovered to be infested with invasive species such as Asian carp, zebra mussels and Eurasian milfoil. Added were nearly two dozen lakes and stretches of the Mississippi and St. Croix rivers.

Say what? Mountain lion spotted in Chaska?

There was a report of a cougar sighting in Edina just last week.

jumping worm

Minnesota DNR: Be on the lookout for invasive jumping worms

The jumping worms can destroy gardens and lawns, and aren't good for using as bait.