Experts know little about how jumbo squid spawn, in large part because the squid spend most of their lives at depths unsafe for diving. Their eggs have never been observed in nature.

Like most cephalopods, Humboldt squid reproduce only once in their lifetime!  Since there is little known about how D. gigas reproduces, there a have been a few theories.  One theory is their color changing ability may be a factor for mating, the males may engage in it to get the females attention.  It is also believed that they lay their eggs on the ocean floor like other squid do, just at unsafe diving depths so we can not get a clear look at what actually happens. Like most cephalopods, D.gigas exhibits semelparous reproduction, meaning they reproduce once in their lifetimes and die shortly after. After slightly more than 200 days, both the male and the female will reach sexual maturity, and then be capable of reproducing.

 Spawning extends throughout the year, but the most important spawning peak occurs from October to January. Although no courtship display of any kind have been documented between mating Humboldt squids, it is thought that given their developed brain, complex eyes, and chromatophore arrays, some type of courtship ritual is highly likely. When mating, fertilization takes place inside the females. The two squids intertwine tentacles, and the male places its spermatophores inside the buccal (oral) membrane of the female ( After large egg masses containing up to 2 million eggs are produced, the female engages in no further parental investment. This is mainly because like most other cephalopods, the Humboldt dies shortly after producing their eggs.

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