Seaweed
"Seaweed" is a colloquial term and lacks a formal definition. A seaweed may belong to one of several groups of multicellular algae: the red algae, green algae, and brown algae. As these three groups do not have a common multicellular ancestor, the seaweed are in a polyphyletic group. In addition, some tuft-forming bluegreen algae (Cyanobacteria) are sometimes considered to be seaweed.
Sea6 Energy
Traditionally, algal-based biofuels have been derived from microalgae that grow in fresh water sources. Shrikumar Suryanarayan and the 4 co-founders sought to research the viability of macroalgae (seaweed) as a fuel source. To do this, they needed a way to efficiently farm the seaweed, which led to the creation of a farming system built from a marine plastics polymer. Sea6 Energy successfully applied for a patent for their aquatic farming structure in 2012 (one of their two patents that has been published).