page_title: Blue catfish
section_title: Pest status
hierarchical_section_title: Blue catfish / Pest status
caption_attribution_description: English: Skeleton a blue catfish, on display at the Museum of Osteology.
context_page_description: The blue catfish is the largest species of North American catfish, reaching a length of 165 cm and a weight of 68 kg. The typical length is about 25–46 in. The fish can live to 20 years. The native distribution of blue catfish is primarily in the Mississippi River drainage, including the Missouri, Ohio, Tennessee, and Arkansas Rivers, The Des Moines River in South Central Iowa, and the Rio Grande, and south along the Gulf Coast to Belize and Guatemala. These large catfish have also been introduced in a number of reservoirs and rivers, notably the Santee Cooper lakes of Lake Marion and Lake Moultrie in South Carolina, the James River in Virginia, Powerton Lake in Pekin, Illinois, and Springfield Lake in Springfield, Illinois. This fish is also found in some lakes in Florida. The fish is considered an invasive pest in some areas, particularly the Chesapeake Bay. Blue catfish can tolerate brackish water, thus can colonize along inland waterways of coastal regions.
context_section_description: The ability of the blue catfish to tolerate a wide range of climates and brackish water has allowed it to thrive in Virginia's rivers, lakes, tributaries, and the Chesapeake Bay. Unfortunately, the relatively low mortality rate, large body size, wide range of species preyed upon, and success as a predator has resulted in the blue catfish being considered a problematic invasive species in Virginia. Since their introduction in Virginia waters in the 1970s, blue catfish populations have exploded. Recent electrofishing studies have documented capture rates in excess of 6,000 fish/hr, whereas studies from the native range show peak electrofishing capture rates of 700 fish/hr. Clearly, blue catfish are a dominant species within the freshwater and oligohaline portions of Virginia's tidal rivers. The introduction of blue catfish in Virginia's tidal rivers was thought to have negative impacts on anadromous American shad, blueback herring, and alewife; however, predation of these species by blue catfish has been demonstrated to be minimal. Much of the narrative that has been built around the species as a dangerous apex predator in the Chesapeake Bay is simply not true. Researchers from Virginia Tech have found the species to be mostly herbivorous and omnivorous, with diets consisting largely of hydrilla and Asian clams, both of which are invasive to the Chesapeake Bay. Blue catfish do eat blue crabs with some regularity, which is problematic because blue crabs represent the most valuable fishery in the Chesapeake Bay.
caption: Blue catfish skeleton (Museum of Osteology)
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