Featured Species

We work on the detection of  invasive species invasive species
An invasive species is any plant or animal that has spread or been introduced into a new area where they are, or could, cause harm to the environment, economy, or human, animal, or plant health. Their unwelcome presence can destroy ecosystems and cost millions of dollars.

Learn more about invasive species
 including the highly invasive bighead and silver carp and round goby. In addition, the office works on improvement of habitat for the endangered Topeka shiner and other priority fish like brook trout and smallmouth bass, endangered freshwater mussels such as the Higgins eye, and fish passage fish passage
Fish passage is the ability of fish or other aquatic species to move freely throughout their life to find food, reproduce, and complete their natural migration cycles. Millions of barriers to fish passage across the country are fragmenting habitat and leading to species declines. The U.S. Fish and Wildlife Service's National Fish Passage Program is working to reconnect watersheds to benefit both wildlife and people.

Learn more about fish passage
for lake sturgeon and other fish and freshwater mussels.

A Silver carp jumping out of the water with boat wake below and a tree lined shoreline in the background

Silver carp (Hypophthalmichthys molitrix) are one of four nonnative fish species belonging to a group commonly referred to as “invasive carp”. Native to eastern Asia, silver carp were introduced to the United States during the 1970’s and 1980’s to private fish farms and wastewater...

FWS Focus
Underwater photo of a bighead carp in a tank with white background

Bighead carp (Hypophthalmichthys nobilis) are native to eastern Asia and are one of four nonnative fish referred to as “invasive carp”. These fish are large, deep bodied fish that have a large head and a large toothless mouth with a protruding lower jaw. The bighead carp eyes are far...

FWS Focus
A pile of mussels.

The Higgins eye is a freshwater mussel of larger rivers where it is usually found in areas with deep water and moderate currents. Its range includes the upper Mississippi River, the St. Croix River between Minnesota and Wisconsin, the Wisconsin River in Wisconsin, and the lower Rock River...

FWS Focus