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Sonic Solution to Algae Growth
Candlewood Lake Authority is on the hunt for viable solutions to the problem of algae growth in Candlewood Lake.

One promising technique, used in Europe and Asia, uses solar-powered ultrasound units that are used to cripple and ultimately kill certain types of algae.

The units employ underwater transducers to emit ultrasonic waves that rupture gas vesicles -- small balloon-like structures that provide buoyancy -- in certain strains of blue-green algae.

When the vesicles collapse, the algae sink to the bottom, where photosynthesis ceases and they eventually die.
The transducers are powered by land-mounted solar panels.


 
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Lock and Dam Changes Aimed at Stopping Invasive Carp - Bighead, silver and other invasive carp have been making their way upstream since escaping into the Mississippi River in the 1970s. These large fish are voracious eaters that compete with native species and pose a threat to rivers and lakes. While no breeding populations have been detected in Minnesota waters, individual fish have been caught in the Mississippi near the Twin Cities, the St. Croix River and the Minnesota River.


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