By Edward D. Murphy / Portland Press Herald
The waters off Chebeague Island will be even greener than usual this winter.
Shearwater Ventures is moving in, joining another company, Portland-based Ocean Approved, in growing and harvesting seaweed in Casco Bay.
Nathan Johnson, who started Shearwater last year, just signed a state lease on nearly 4 acres of seabed. Johnson intends to grow sugar kelp, his foray into the $5 billion worldwide kelp industry.