Something called Methylococcus capsulatus might not sound an appetising ingredient for a meal. Methylococcus is a methanotroph, a bacterium that metabolises methane. Fortunately, salmon are not fussy eaters. They will happily consume pelletised protein made from these bugs. And that could be handy for fish farmers—at least it will be if Alan Shaw, boss of Calysta, a biotechnology firm in Menlo Park, California, has anything to do with it. For Dr Shaw proposes to take advantage of the rock-bottom price of methane, a consequence of the spread of natural-gas fracking, to breed Methylococci en masse as a substitute for the fish-meal such farmers now feed to their charges.
Shaw seems confident Calysta’s bacterium-based biotechnology, which should turn out more than 8,000 tonnes of bacterial fish food a year per reactor, can do so at a cost well below the $2,000 a tonne at which fish-meal now sells—and that it will be available commercially by 2018. If this comes to pass, not only will it help fish farmers, but it may also relieve pressure on wild fish stocks in the world’s oceans.
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