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A Sound Way to Keep Out Invasive Carp?
University of Minnesota researcher Peter Sorensen and his team, including doctoral student Dan Zielinski, have discovered that the carp are sensitive to — and annoyed and deterred by — sounds not heard by most other fish. This information could be the key to stop the spread of bighead and silver carp in the Mississippi River.

A carp’s “hearing” is 10 to 100 times more acute than that of all native fish, except catfish, because of a rib bone that vibrates against its swim bladder, essentially turning the organ into a large eardrum. In a study of carp in a tank, Zielinski found that by playing combinations of louder and softer low-frequency sounds — a din similar to a boat motor — he could both annoy and deflect the fish.

The team is looking at installing speakers prior to spawning this summer. They problem, they need funding and the traditional source of funding, the university and the Legislature — don’t turn around funding rapidly so they are looking for money where ever they can.

 
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Delafield Eyes Purchase of New Weed Harvester - In an effort to keep Lake Nagawicka navigable, plans are in motion within the city of Delafield to purchase a new weed harvester. The city's existing weed harvesting equipment is at least a decade old and has begun breaking down. Replacement costs also have been expensive.


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