Mpls lakes FYI

So then, the AIS threat is over. whew!

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So then, the AIS threat is over. whew!

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Called on account of falling temps.

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So then, the AIS threat is over. whew!

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Called on account of falling temps.

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Good one James, that’s a knee slapper!

Must have been some state money to be spent by years end….

Here is the information from the DNR that I sent the MPLS Park board to consider in making their determination about Zeb’s and Fall

on the subject of how long veligers may be in our lake waters in fall. In our sampling, we rarely encounter veligers in any October samples. In Mille Lacs Lake, the number of veligers is dramatically reduced in mid-September samples (less than ½ veliger in a liter of water), although they are still present. We don’t have any samples after September in Mille Lacs. However, in 2011 we found veligers consistently throughout the main part of summer and into September in a number of sites on Lake Minnetonka. In the October samples from Minnetonka, there were no veligers found.

A two year study in Lake Erie in the early 1990’s found none or very few veligers in mid-October samples, and very low densities in the September samples.

There has been a report from the Great Lakes area that a researcher has found veligers during winter periods, with the suggestion that these are overwintering veligers. The one through-ice sampling we did in March on Mille Lacs Lake this year did not find any veligers at samples collected at seven sites in the southeastern portion of the lake.

Our data suggests that veligers are either not present or are in extremely low numbers in fall times (October). We have little data for frozen time frames, but the one sampling on Mille Lacs didn’t find any.