Germany’s largest fishing vessel will leave the Netherlands this week, towed by a giant kite harnessing trade winds for South America that will help cut its fuel consumption by up to a third. The 15,000 tonne ‘Maartje Theadora’ is the first fishing vessel to use the system, in which a 160 square metre blue and white kite similar to a paraglider pulls the ship on a 300 metre rope, assisting its main engine.