At the end of the 16th century, a Dutch fleet traveled to the legendary Spice Islands to create new trade relationships. Under Captain Keyser, the positions of 135 stars were measured during this journey, which were later included by Peter Plancius in his sky maps. From these he recognized twelve new constellations, including "Den Dorado", the goldfish or the common gold mackerel. The Dorado is a predator of the tropical oceans that offered the crew a variety from the usual food. A few years later, the constellation was recorded as "Doradus" in the new Sky Atlas. Why the common gold mackerel got the name "swordfish" in English is unknown.