Seth Barker of Maine Fresh Sea Farms, which grows sea vegetables in Walpole, holds a guide line while Sarah Redmond of Maine Sea Grant attaches a string of winged kelp to a line on Clark Cove.

Barker checks the growth of a seaweed line in Clark Cove.

Buoys mark different lines of seaweed growing in Clark Cove.

Organic sugar kelp grows on string wrapped around a plastic pipe in a water nursery.

Organic sugar kelp grows on string wrapped around a plastic pipe in a nursery at Darling Marine Center.

Sarah Redmond of Maine Sea Grant checks on an experimental line of dulse in Clark Cove.

Barker talks about kelp growing in tanks in a nursery at Darling Marine Center in Walpole.

Barker and Redmond head out to seed new lines of kelp in Clark Cove.