Cochlodinium, the rust-colored algae bloom that has turned up in Cape Pogue and Sengekontacket Ponds, has now invaded Lagoon Pond, Martha’s Vineyard Shellfish Group director Rick Karney confirmed this week. The algae was found in the west arm of the Lagoon.
Volunteer Edgartown shellfishermen worked the tides last week to transfer young bay scallops out of harm’s way at Cape Pogue Pond, after an algae bloom seen a year ago returned.
Cochlodinium polykrikoides, a single-cell dinoflagellate, staged a late-summer comeback in the large, pristine bay that lies north of the Dike Bridge on Chappaquiddick. The algae is not harmful to humans but can be toxic to shellfish.
On Thursday morning all was right with the Lagoon Pond. The water was clear, blue-green crystal, by all appearances the very picture of estuarine health. Just a day before, the water was clouded by an unsightly yellowish-brown fog from the head to the mouth of the Lagoon. It was an explosion of prorocentrum, an algae, and the largest one that Martha’s Vineyard Shellfish Group director Rick Karney has ever seen.
A rare algal bloom has shut down shellfishing in Lake Tashmoo during a week where other Vineyard swimming spots were closed because of bacteria.
Seth’s Pond, the popular swimming hole in West Tisbury, has been closed to swimmers for more than a week because of high levels of enterococcus bacteria. The same bacteria led to a brief closure of Pay Beach in Oak Bluffs.
Starting Wednesday, Lake Tashmoo was closed to shellfishing because of a toxic algae bloom that some said is rare to Vineyard ponds.
