October 4, 2019 — Two weeks ago, lobstermen working off Scorton Creek started seeing something they had never experienced. Lobsters, in fact everything in their traps, were coming up dead.
Massachusetts Division of Marine Fisheries senior biologist Robert Glenn started fielding phone calls from puzzled fishermen Sept. 23. The fishermen were worried there might be something in the water that was killing the lobsters, fish, shellfish, even sea worms.
It turns out, it was something missing from the water: oxygen.
For the past two weeks, division researchers and scientists from the Center for Coastal Studies in Provincetown have boarded vessels and taken water samples, gathered temperature data at various depths and measured the amount of oxygen dissolved in the water. Preliminary results from testing on dozens of dead lobsters found nothing toxic in the water that could have killed them, and the focus was on a phenomenon that occurs every year — low oxygen in the layer of water along the ocean bottom, Glenn said.