Zebra mussel larvae have been found in two northern Minnesota lakes — Ten Mile Lake near Hackensack and Lomond Lake near Bagley.
The discovery puts both lakes on the state's infested waters list.
Minnesota Department of Natural Resources officials said 17 microscopic zebra mussel larvae, called veligers, were found in a water sample from Ten Mile Lake and 30 were discovered in a sample from Lomond.
Although no adult or juvenile zebra mussels have been reported, the number of veligers spotted indicates a reproducing population.
Lomond is the first lake in Clearwater County to be put on the infested waters list for zebra mussels.
According to the DNR, 30 bodies of water were added to its list of zebra mussel infestations this year, including Lotus Lake in Chanhassen.
The DNR recently confirmed that five microscopic mussel larvae were found in a water sample from the lake. In a follow-up search, five adult zebra mussels were found on a dock in another part of the lake.
DNR officials advise lake property owners to inspect and take precautions in removing boats, trailers, docks and lifts and other equipment.