Move over blue crabs. The Maryland Department of Natural Resources has launched a program that encourages restaurants to feature oysters — the Chesapeake Bay’s tastiest form of water filtration — on menus year-round.

The Maryland Oyster Pledge mirrors the state’s True Blue Program that has helped consumers verify whether the blue crab being served at restaurants was truly from the Bay (and worth the higher sticker price).

DNR is asking participating restaurants to sign a pledge that they’ll keep at least one Maryland oyster on their menus at all times. This can include shucked product or oysters on the half shell.

“By having Maryland oysters on your menu, you are helping to improve water quality and habitat in the Chesapeake Bay,” the department says on its Maryland seafood website.

Oyster aquaculture has grown exponentially in the state to an industry that now employs about 300 oyster farmers (not including the even bigger oyster industry that Virginia claims).

The oyster pledge aims not only to get more bivalves onto menus, but also to get more consumers to eat them via education and creative preparations.

Literature from the program tells consumers that shellfish filtered water equivalent to the entire volume of the Bay every few days 100 years ago. Now that oysters are at 1 percent of their historic abundance, this filtration happens once every few months instead.

Farmed oysters also helped fill the gaps this year on menus as the region dealt with a shortage of blue crabs. While blue crabs are in finite supply — more in some years than others — the number of available oysters continues to grow with the aquaculture industry.

Steve Vilnit, director of fisheries marketing for the DNR, said Maryland added 13 new oyster farms this year and expects to see another 100 come online in the coming year.

The more oysters, the cleaner the water. Now just to get more people to eat them. Learn more about the new Maryland Oyster Pledge here.