A 10 metre-long squid, believed to be the largest ever found, was caught by New Zealand fishermen in Antarcticaâs Ross Sea. The colossal squid, weighing an estimated 450kg was eating a hooked tooth-fish when hauled to the surface. Colossal squid grow up to 12m-14m and is the largest known squid species as well as the worldâs largest invertebrate. If it was turned into calamari the rings would be the size of tractor tyres. The squid will be preserved for scientific study, then go on display at Te Papa in Wellington.