Brazil France Germany India Indonesia Iraq South Africa
 
 
Sign up for our
free e-newsletter.





Case Studies
E-Newsletter
News
Resources
Water Management Associations
 
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.

 
Click for the full article
 


About Us Categories From The Gallery   News Updates News Updates

Our Company
Case Studies
Products
Site Map

Resources/Tools
Parts/Service
International

Ground Water May Contain Decades Old Contamination - Nitrogen and phosphorus are the two plant nutrients in sewage and fertilizer that foul the bay, feeding its algae blooms and "dead zones." Both are washed off the land into streams whenever it rains, but nitrogen dissolves in water, so it also soaks down into the soil, ultimately reaching the water table.


© 2010 Copyright Aquarius Systems. All Rights Reserved. info@aquarius-systems.com   |   (262) 392-2162