Over 50 Invasive Carp Captured on Mississippi River

Wed, 19 Jan 2022 18:20:08 +0000

The Minnesota Department of Natural Resources is conducting an immediate response to the capture of 51 invasive carp on the Mississippi River. The invasive carp were caught by two commercial fishing operators near La Crosse and Trempealeau, Wisconsin, during routine spring netting in March.

When the commercial fishing operator operating near La Crosse saw what he thought were invasive carp, he contacted the DNR. The DNR invasive carp field crew assisted in removing and identifying the fish. The DNR identified 39 silver carp and 11 grass carp caught in Pool 8 of the Mississippi, just south of La Crosse, and one silver carp caught in Pool 6, about 20 miles farther upstream. All invasive carp recovered have been given to the U.S. Fish and Wildlife Service to determine their age, size and gender.

Previous captures of invasive carp in Minnesota have been individuals or small numbers of fish. This capture indicates an increase in the abundance of invasive carp in the Pool 8 portion of the river between Minnesota and Wisconsin.

Carbon Dioxide Could Keep Asian Carp out of Great Lakes

Tue, 05 Jul 2016 23:00:00 +0000

In a research pond in La Crosse, Wisconsin, scientists from the University of Illinois at Urbana-Champaign and U.S. Geological Survey are testing the effectiveness of a new strategy to ward off an Asian carp invasion that’s threatening the health of the Great Lakes, including Lake Michigan.

The study called for placing a carbon dioxide infusion system on one side of the pond that withdrew water, treating it with high levels of carbon dioxide and then pumping that carbon dioxide-rich water back into the pond. Results showed that silver carp and bighead carp, two different species of Asian carp, avoided water treated with carbon dioxide as did native fish such as bigmouth buffalo, channel catfish and yellow perch. However researchers are puzzled as to why the paddlefish did not avoid the area.

Adding carbon dioxide to the water is indicative of poor habitat causing the fish to swim away and look for more oxygen. The carbon dioxide lowers the water’s pH, making it more acidic.

If adding carbon dioxide to the water does go into a real-world setting, it would deter the movement of all fish species, so that’s something that needs to be considered before it moves to a field application.

Read More https://afspubs.onlinelibrary.wiley.com/doi/10.1080/00028487.2016.1143397

silver carp – Aquarius-Systems

Over 50 Invasive Carp Captured on Mississippi River

Carbon Dioxide Could Keep Asian Carp out of Great Lakes