February 4, 2020 — The catastrophic die-off of Peconic Bay scallops in eastern Long Island waters may be tied to a previously undetected parasite that can infect the kidneys of adult and juvenile scallops, state regulators reported Friday.
The specific parasitic organism, known as coccidian parasite, was discovered in kidney tissue of all 32 scallops collected and sampled from Shelter Island’s Hay Beach last November, the state Department of Environmental Conservation said. Some scallops had “extensive damage” to renal tubes, enough to kill the most heavily infected, the DEC said.
The agency, working with Stony Brook University’s Marine Animal Disease Laboratory, said the parasite “represents a significant threat” to the scallops, but cautioned that “further research is needed” to study how widely the parasite may have been dispersed, its life cycle and rate of infection before it can be said with certainty that it was the direct cause of the die-off.
“This is a new factor that scientists think may have a prevalent effect,” a DEC spokeswoman said.
Biologists last year theorized a combination of factors may have spurred the catastrophic collapse of Peconic Bay scallops, which saw mortality rates of from 90% to 100% in many eastern waterways.