The Washington Post
Solar-powered barge could take oyster farming deeper into Chesapeake
Two Maryland companies have teamed up to design a solar-powered barge that could bring oyster farming into deeper parts of the Chesapeake Bay, improving the estuary’s oyster output and perhaps easing conflicts with watermen and waterfront landowners.
The two companies — Maritime Applied Physics and the Ecologix Group — are developing a rig mounted with solar panels that holds oysters in vertical columns up to 20 feet deep. Oysters typically grow in cages or reefs resting on the bottom of shallow water or in cages floating at the surface, so this technology would allow oyster growers to better take advantage of deeper waters.
The companies, under the aegis Solar Oysters, are crafting prototypes in hopes of setting up a demonstration oyster farm in the coming year to attract investment for their design. The initial models have been small, but the concept calls for much larger barges floating in the Chesapeake in the years ahead, which experts say could have a big effect on the aquaculture industry.
The barges would automate many steps of the oyster-farming operation. With energy from the sun’s rays, the floating apparatus can rotate growing oysters to the surface and clean the cages, simplifying the work of aquaculture laborers, said Mark Rice, president of Baltimore-based Maritime Applied Physics and principal of Solar Oysters.
“There was not a lot of automation in raising oysters in Chesapeake Bay. There’s a lot of backbreaking work that is often done in water and during winter months. And our hope was that we could make that work easier,” Rice said.
With the solar-powered barge, workers wouldn’t have to hoist large cages of oysters from the water, for instance, Rice said.
With solar energy, the barge also could conduct water quality monitoring and run the security system, among other tasks. The project also may help reduce conflict among oyster farmers, waterfront property owners and watermen, said Tom Miller, director of the Chesapeake Biological Laboratory at the University of Maryland Center for Environmental Science.
Waterfront landowners often express concerns that oyster farms near the shoreline — and the network of buoys and docks that may come along with them — disrupt their scenic views. And watermen often quarrel with oyster farmers, who they feel are taking over parts of the shallow bay with plenty of wild oysters to be harvested to create their farms.
“What this solar-powered oyster technology offers is the potential to move oyster aquaculture into deeper water, which will reduce — if not eliminate — the conflicts between all three groups,” said Miller, who worked on the Solar Oysters project. “It’ll move oyster aquaculture into water that’s deeper where natural oysters don’t occur.”
One thing that remains to be seen, though, is how the oysters will react. So far, the companies have only built smaller prototypes, although a larger model, which will be 90 feet by 53 feet, is on the way.
“The unknown is whether or how well oysters will grow when they are being slowly rotated through the water column, rather than at a fixed depth,” Miller said.
Another key question is whether the solar-powered water jets meant to clean off the oyster cages when they rise to the surface will be strong enough to remove marine organisms that may attach.
“If they still have to have someone out there scrubbing the cages, it hasn’t reduced the labor as much as they think it has,” Miller said.
Despite the testing that remains, Miller said, the project represents a meaningful step toward innovation in the aquaculture industry, innovation that wouldn’t have been possible not too long ago.
“If you’d have done it a decade ago, the solar panels weren’t efficient enough to allow you to power the movement of the cages,” he said. “And that’s part of what Solar Oysters think they’ve done.”
The cost of the barge also will weigh heavily in its success, said Matthew Gray, an assistant professor at the University of Maryland Center for Environmental Science’s Horn Point Laboratory who did not work directly on the Solar Oysters project. Oyster farms would purchase the barges and operate them.
“Labor is a huge cost of oyster agriculture. And if some of that can be automated, as well as powered by the sun, that would be kind of a game-changer for production costs in the bay,” Gray said.
Rice said the large barge probably will cost about $800,000. Solar Oysters’ goal is for the rig to allow farmers to raise bivalves at a cost of 24 cents per oyster, he added, because oysters are often sold for 50 cents each.
During the coronavirus pandemic, though, industry groups have complained of depressed prices resulting from a slump in demand. As customers avoid seafood restaurants for fear of contracting the coronavirus, they’ve turned away from oysters, which can be difficult to shuck and prepare at home.
Solar Oysters is hopeful that it can be a part of an industry rebound in the years ahead.
“The industry has very far to go in terms of coming up to speed with large-scale, optimized production of shellfish,” Gray said. “So this technology represents a pretty big step.”