CHATHAM — Strange things have been happening in recent years in the Gulf of Maine, the 36,000 square miles of relatively enclosed ocean stretching from Cape Cod to Nova Scotia. Low-oxygen zones have become annual occurrences, a large brown algae bloom in summer 2023 grew from Maine to northern Massachusetts, and looming over it all is the accelerating warming of surface waters. The Gulf of Maine is warming three times faster than the global average, according to the Maine Climate Council, which is faster than 99 percent of the world’s oceans.
Understanding these phenomena and their effects on fisheries is difficult, said Owen Nichols, Director of Marine Fisheries Research at the Center for Coastal Studies, because of the lack of data available on the ocean water below the surface — at the depths where most fish live.
There is one group of people, however, who regularly put equipment deep in the ocean: fishermen. And many of them are already working with scientists to gather data on the water.
But on Oct. 31, Gov. Healey’s administration announced a nearly $2 million grant to the Chatham-based Cape Cod Commercial Fishermen’s Alliance that will significantly expand fishing vessel-based measurements. The grant is from the quasi-public Mass. Technology Collaborative.
Since 2001, a Northeast Fisheries Science Center project has partnered with local fishermen to try to fix the lack of data about the depths. The project, called eMOLT (Environmental Monitoring on Lobster Traps and Large Trawlers), has so far installed sensors on about 100 fishermen’s gear to gather data on stratification of water temperature, dissolved oxygen levels, and other parameters.
The sensors then either relay the information back to the fishermen and scientists in real time or store it on the sensor to be collected at the end of the season.
The Alliance plans to put 450 sensors on 150 boats and their gear over the next two years. Fifty of those will be boats working on the Lower and Outer Cape and will have their installations done by the Center for Coastal Studies, said Nichols. Currently, there are around 12 vessels on the Outer Cape equipped with sensors, only about half of which are fishing at any one time, he said.
This project, Nichols said, will help scientists develop their understanding of Cape Cod Bay and how it’s changing. “So much of what we know about warming temperatures in the Northeast comes from surface observations,” he said. “Having more bottom temperature observations will really help us better understand these processes.”
Surface temperatures can be gathered with satellites, he said, but deeper data require either trips on an oceanographic vessel or maintaining a bottom mooring, both of which are very expensive.
Participating fishermen get a $500 stipend to participate and will have access to all the data in real time onboard their boats. It’s information that can be useful to fishermen in choosing where to fish, especially for lobsters and clams, according to Melissa Sanderson, the Alliance’s chief operating officer.
When the boats are all equipped, the project will constitute the largest cooperative network of environmental sensors on fishing boats anywhere in the U.S., according to the Mass. Technology Collaborative’s announcement.
The data loggers, which were designed by East Falmouth-based Lowell Instruments, will be installed on fishing gear like trawls and lobster traps and will record temperature, salinity, and dissolved oxygen content down the entire water column.
That the data will be available in real time will also allow the system to work as an early-warning system, Nichols said. “If we’re seeing some oceanographic phenomenon, it lets us respond to it very quickly to get more observations,” he said.
Nichols added that installations are already underway. “We’re going to be putting them out as fast as Lowell can make them,” he said.
He said that fishermen have been enthusiastic about getting involved in the project. “Fishermen are oceanographers in their own right, and they pay a lot of attention to wind and temperature and things like that,” Nichols said. The project, he said, “really creates an opportunity for us to learn and study the ocean together.”
Truro-based lobsterman Mike Rego of the F/V Miss Lilly, who first got involved with the project four years ago when it was much smaller, has five sensors on his gear. “I’m always moving gear every day trying to find the lobsters,” he said. “I cover a lot of area in the course of the summer.”
Rego said he first got involved because of the stipend and the chance to do some science but has stuck with it because of the need to examine the local effects of climate change. “I think it’s something that needs to be addressed, and the best way to do it, I believe, is the guys that make their living on the water,” he said.
Rego said that he can use the sensors to identify areas with the right bottom temperature for lobsters and avoid low-oxygen areas. But with only five sensors, it is not an all-encompassing system. “It’s not like those sensors are giving me a gangbuster year,” he said.
Jeff Souza, a Truro-based fisherman on the F/V Crash, is also participating. He took over a set of sensors from his father, William, though those sensors do not show him the data in real time — he still measures bottom temperatures for his own work by taking the temperature of freshly caught lobsters with an infrared laser thermometer. Nichols installed a real-time sensor on his scalloping boat last week.
Souza sees the program as a way that fishermen can help guide management decisions. “If someone says, ‘Well, this is what’s happening on the bottom,’ ” he said, “we can all guess what we think is going on, but without data, there’s no way to prove it.”
Sanderson agrees. She thinks that by correlating temperature observations with catches, the project can help guide management decisions, for example, as warmer water species arrive.
“If black sea bass and golden tilefish are the future of Cape Cod,” Sanderson said, “we need to figure out how and when that’s happening and then work with the managers to figure out how we’re going to make sure that Cape Cod fishermen are allowed to catch those species.”