Noah Bressman, a biologist at Salisbury University in Maryland, begins dissecting of a large blue catfish to determine the contents of its stomach.
In terms of appetite and willingness to gorge on just about anything, blue catfish have few peers in the Chesapeake Bay, experts say.
“They’re eating everything, anything they can get their mouths around,” said Noah Bressman, a fish biologist at Salisbury University in Maryland.
Now, a clearer picture is emerging of their ecological toll. Two new studies based in tidal rivers on opposite sides of the Bay show that the invasive species is gobbling up prized native aquatic life, such as menhaden and blue crabs, at high rates.
Previous studies have suggested as much. But the latest research adds important insights.
The investigation conducted by Bressman’s team marks the first time that the nonnative’s eating habits have been examined on the eastern side of the Bay. Meanwhile, Virginia scientists have used a previous blue catfish stock assessment to produce another first: estimates of how much of each species is eaten within a major Chesapeake river.
The goal is to determine whether plentiful and voracious blue catfish are endangering the survival of their prey within a particular river or even the entire Bay complex. Many anglers and biologists have suspected as much. They just lack the scientific evidence to prove it.
The new research brings observers closer to that goal, said Dave Secor, a fisheries biologist with the University of Maryland Center for Environmental Science. “Some of these numbers show potentially very large impacts to predation of prey species,” said Secor, who wasn’t involved with the studies.
Noah Bressman, left, and Davis Carter fish for blue catfish in Maryland’s Nanticoke River as part of…