AS A boy, Antoine Hubert used to catch butterflies. These days, the agro-engineer has eyes only for meal worms. In a demonstration factory near Dole in eastern France, he shows how trayfuls of plump, half-grown worms are fed, left to grow in a darkened dormitory, and then—after two months—slaughtered and cleaned with a blast of steam. A machine divides the resulting mush into oil and protein powder.
Around 70% of a worm is protein, making it ideal for animal feed. Demand is soaring, notably at fish and shrimp farms. Mr Hubert predicts aquaculture businesses will need 70m tons of feed annually in ten years’ time, up from 40m now. The global market for animal feed, he reckons, is already worth €500bn ($610bn).