Fish
Blue Catfish
Ictalurus furcatus · also called blue cats
In its native Mississippi and Missouri river systems, the blue catfish is simply a large, valued native fish. In the Chesapeake Bay, where it was introduced, that same size, broad appetite, and tolerance for brackish water have turned it into one of the region’s most persistent invasive species problems, expanding steadily at the expense of native fish.
Overview
The blue catfish, Ictalurus furcatus, is one of North America’s largest catfish species, native to major river systems of the central United States. Introduced into the Chesapeake Bay watershed, it has become a significant and expanding invasive species.
A native asset, an introduced problem
The same traits that make the blue catfish a prized native sport fish back home, its size, adaptability, and broad diet, are exactly what make it so difficult to control in the waters where it was never meant to be, prompting fishery managers to actively encourage harvest rather than protect it.
Status
Least Concern overall, with an increasing trend driven largely by its rapid expansion as an invasive species in the Chesapeake Bay watershed.
Blue Catfish: common questions
Why is the blue catfish considered a problem in the Chesapeake Bay?
The blue catfish was introduced outside its native central United States range into the Chesapeake Bay watershed, where its large size, broad diet, and tolerance for brackish water have allowed it to thrive and expand rapidly, competing with and preying upon native fish populations in a way that has made it a significant invasive species concern for the region.
How big can a blue catfish actually get?
The blue catfish is one of the largest catfish species native to North America, capable of reaching a substantial size that places it among the continent's biggest freshwater fish, a trait that makes it a popular target for anglers seeking a trophy catch both within its native range and in areas where it has been introduced.
Why can a blue catfish survive in both fresh and brackish water?
A blue catfish shows notable physiological tolerance for brackish water conditions, unlike many strictly freshwater catfish species, allowing it to thrive in tidal river systems and estuaries where salinity fluctuates considerably, a flexibility that has directly supported its successful and rapid spread through the Chesapeake Bay's tidal waters.
What are fishery managers doing about invasive blue catfish?
In regions such as the Chesapeake Bay where the blue catfish has become invasive, fishery managers have actively encouraged increased recreational and commercial harvest of the species as a management strategy intended to help control its expanding population and reduce the resulting pressure on native fish communities.