Seldom seen bottom-feeders only live where the water is deep and clean, like the St. Croix, and can alert scientists to pollution.
The strange and seldom seen fish grow up in the lower St. Croix, then make an incredible journey back to the Sargasso Sea to breed.
Commercial fishermen catch carp and more in the cold waters at Point Douglas.
Renovated fish tanks highlight the diversity of habitat and fish species in the river.
The Lake Sturgeon in the St. Croix and Namekagon Rivers are an ancient, unique and delicate fish species.
The January 19 presentation will feature a Wisconsin DNR scientist presenting research on the Namekagon and St. Croix Rivers about the ancient fish.
Our correspondent recently spent a day learning exactly what swims in the St. Croix.
A bighead carp caught in the St. Croix near its confluence with the Mississippi has big implications for the future of native fish in the river.