We propose that the Humboldt Current squid and the Gulf of California squid are separate stocks and possibly subspecies of D. gigas. Data from 6,824 unsexed specimens from sperm whale stomachs and 43,256 sexed specimens from the fishery are used to try and increase our knowledge of the biology, life history and migrations of D. gigas from the Humboldt Current, and to make recommendations for the future management of the fishery, including a proposal that May and December be made closed seasons to protect the spawning squids.