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It's been two years since the invasive spiny water flea was confirmed in northern Minnesota's  Lake of the Woods, but state experts say they haven't seen negative effects yet from the species. 


      The species came to North America from Europe in the ballast
water of Great Lakes ships. It was reported in the Rainy River
watershed in 2006, and by the spring of 2007, the Department of
Natural Resources had declared Lake of the Woods, Rainy River and
other lakes and rivers in the watershed infested.
     


 Spiny water fleas, a type of plankton, compete for survival with
native zooplankton, which walleye and other northern fish need to
survive. 


The spiny water flea, characterized by a large spiny tail,
has little nutritional value for fish, and its arrival caused a
scare in a region where the economy relies on fishing.


      But Tom Heinrich, a large lake specialist for the DNR, said his
testing has yet to measure much, if any, impact.
      

"It doesn't seem like they're becoming more abundant," said
Heinrich, who's based in Baudette.

      Lake of the Woods has a large population of fish called
tullibees that can feed on all types of plankton, and that may be
keeping the spiny water fleas in check, he said.
      


"It's so dependent on the fish community that they're invading,
and if you have a very robust community, in some cases, they don't
have a huge impact because there's no niche for them to move
into," Heinrich said.

      In fact, locals have reported a great summer for fishing on Lake
of the Woods. 

But Heinrich warned anglers should take spiny water
fleas and other invasive species seriously - keeping boats clean,
drying out anchor ropes and landing nets and following regulations
to prevent their spread into new waters.

      Information from: Grand Forks Herald,
http://www.grandforksherald.com

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It's been two years since the invasive spiny water flea was confirmed in northern Minnesota's  Lake of the Woods, but state experts say they haven't seen negative effects yet from the species.

DNR: Invasive water flea hasn't hurt Lake of the Woods

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