I'm a big fan of biofuels if the come from a smart feedstock. I don't know enough about aquaculture to know if this is the answer, but it's certainly a compelling argument.

Citing the work of Robert Glenn, a plant biologist at the University of Arizona, two biologists argue in this week's Science that "the increasing demand for agricultural products and the spread of salinity now make this concept worth serious consideration and investment."

Glenn has been arguing for the value of all kinds of saltwater farming to a small but growing audience for nearly thirty years, but it is the demand for biomass to turn into fuel that brought NASA calling. His team's report for the agency estimates that salt-loving crops could be used to produce 1.5 billion barrels of ethanol annually on a swath of new agricultural land almost five times the size of Texas.