In May 2018, in response to anecdotal evidence of high numbers of carp within the Long Lake Creek Sub-Watershed, Long Lake Waters Association (LLWA) with support of the City of Long Lake, the City of Medina, and the Orono Lions Club began an effort to gather scientific data regarding the specific population levels of invasive carp within the watershed.
LLWA coordinated the hiring of WSB & Associates to conduct a biomass/population estimate. In October 2018, WSB provided a formal estimate of approximately 17,000 carp, equivalent to about 167,000 lbs of carp or 570 lbs/acre. Ecological damage is projected for values at and above 89 lbs/acre. The levels of carp in Long Lake Creek Sub-Watershed are more than five times the threshold level that impacts water quality and ecological integrity.
WSB also surgically implanted radio-tracking devices in the carp to track their movements within the sub-watershed.
Tracking of the carp is currently underway!
Using electrofishing and radio telemetry surveys, WSB is identifying the migratory patterns of the carp over the seasons. A variety of techniques and technology are used when doing this work during the harsh Minnesota winters. Snowplows are used on the ice to 'herd' the carp, as the vibrations and noise help drive the carp together. Underwater submarines are used to place ropes under the ice that will guide the nets for a biomass harvest.
This information will help assist commercial fishermen to find and remove a large volume of carp from the watershed to help improve the water quality.