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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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Ecological Value of Exotic Water Plants Equals that of Indigenous Species - If you look at the role of exotic water plants in an ecosystem, you won't find any significant differences compared to indigenous species. Researchers studied seven essential functions of water plants in experiments with indigenous and non-indigenous species. They looked among other things at the impact of the plants on the habitat and food supply of fish and small aquatic animals, on cyanobacterial growth and on greenhouse gas emissions. What they found was that all things considered, the two groups are not fundamentally different.


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