. >> eric wisner and his uncle, mike lindemon, have about 360 acres of leased bottom in the nanticoke river. they dredged the public fishery during oyster season, and harvest oysters from their aquaculture beds the rest of the year. >> for the past 3 years we've been putting around 50 million baby oysters on our leases. and each one of those oysters has the potential of filtering 50 gallons of water a day, and once when you start doing the math, you start entering into the trillions of gallons of water that get filtered just by your little operation. >> starting a lease is extremely challenging because you are tasked with taking bare end bottom and improving it to the point where you can harvest oysters. >> eric wisner had to add 4 inches of substrate before he planted spat on shell in his oyster farm. his investment seems to be paying off. he saw some market sized oysters in about 18 months. another challenge to restoration for both sanctuaries and aquaculture is shell. at one time there were hundreds of shucking houses in maryland, but today, there are only a handful, and only one y