In January 2021, scientists, engineers, and contractors will begin installing a temporary, experimental underwater Acoustic Deterrent System, or uADS, at Mississippi River Lock and Dam 19 between Keokuk, Iowa, and Hamilton, Illinois. The construction is part of a study to … Continued
Biologists with the departments of natural resources in Minnesota and Wisconsin have determined that several fish kills reported in and around the Mississippi River near La Crosse are due to hypoxia, which occurs when there are unusually low levels of … Continued
A 107-pound, 69.5-inch paddlefish caught in 1981 by Robert Pranschke of Onawa holds the record as Iowa’s largest official state record fish. An even larger paddlefish speared in the Iowa Great Lakes area in the early 1900’s weighed nearly 200 … Continued
U.S. Geological Survey (USGS) scientists have extracted DNA from fish eggs found in northern sections of the Upper Mississippi River and have determined that the eggs and larvae are not from Asian carp. Genetic analysis instead shows that the fish … Continued
Asian carp eggs, including late-stage embryos nearly ready to hatch from the egg, were recently identified in samples collected by U.S. Geological Survey scientists in 2013 from the Upper Mississippi River as far north as Lynxville, Wisc. The eggs and … Continued