Maine closes shellfish flats in Brunswick and Harpswell during Casco Bay algae bloom
The Department of Marine Resources says an emergency rule shut harvesting in Maquoit Bay and part of Middle Bay to protect stressed clams. The bloom is not a threat to people, and shellfish on the market remain safe to eat, the department says.
Maine's Department of Marine Resources has closed shellfish harvesting in two Casco Bay areas as a bloom of the phytoplankton Karenia mikimotoi works its way along the coast, the agency said.
Under an emergency rule adopted Sept. 18 and effective Sept. 19, the closure covers the entire intertidal growing area of Maquoit Bay in Brunswick and the eastern side of Middle Bay in Harpswell. The department said it was concerned that continued digging during the bloom would put more stress on the shellfish and increase die-offs.
In an update posted Wednesday, the department said the bloom is not toxic to people and that shellfish may still be harvested and sold elsewhere during it. The agency said there is no risk from skin contact or from eating shellfish or other seafood.
The department said it began monitoring the bloom in early September, when counts in Portland reached 2 million cells per liter and the water turned brown and gave off an odor. By Sept. 16, the bloom was visible from the Maine-New Hampshire border to Penobscot Bay, though the agency said damage on mud flats has been concentrated in Casco Bay, at Maquoit Bay, Middle Bay and Broad Cove in Cumberland.
Cell counts in Casco Bay have been trending down and the bloom may be past its peak, the department said. It reported a maximum count of 5 million cells per liter in Maquoit Bay, with outside groups reporting counts as high as 12 million. Bigelow Laboratory for Ocean Sciences confirmed the species through genetic analysis, according to the department.
The last bloom on that scale, in Casco Bay in 2017, peaked at 44 million cells per liter, killed shellfish and lobsters in some communities and lasted about three weeks, the agency said.
This brief was drafted by AI from a public agency press release and published by The New England Signal. Why we use AI for stories like this one.