Crayfish, lobster or langouste - whatever the name, it is among the most sought after animals in the sea, but surprisingly little is known of the life of crayfish on the reef. Even more curious are the crayfishes' activities in the depths at the dead of night; followed by the never-before-seen release of larvae at dawn. We follow these larvae on their yearlong voyage at sea and then pick up the trail on the mysterious underwater marches of the adults. Where do they come from and where do they go? Alistair McDiamid and his colleagues from the University Research Station (Leigh Marine Laboratory, University of Auckland) at the Goat Island Marine Reserve have conducted a scientific study of the crayfish in the protected marine reserve in an attempt to halt the decline in crayfish numbers and to chart their migratory patterns.