Most commercial farms are designed and built from the ground
up, with shallow raceway ponds circulated by paddlewheels. They
operate in a similar fashion to Earthrise Farms. Ponds vary in size up
to 5000 square meters (about 1.25 acres), and water depth is usually
15 to 25 centimeters. They require more capital investment per area
than lake farms, and operate at higher efficiency and quality control.
wild algae,