How the Humboldt squid’s genetic past and present can secure its future — ScienceDaily

A group of marine biologists is pushing for more international collaboration to manage the Humboldt squid population after their study to identify its genetic stocks revealed its vulnerability to overfishing by fleets trying to feed the world’s hunger for squids.

Hiroshima University marine biologist Gustavo Sanchez led a team of researchers to find out the genetic structure of the Humboldt squid population in the Eastern Pacific Ocean using two types of DNA markers — the mitochondrial ND2 gene and nuclear microsatellite loci.

The team found that Humboldt squids could trace back their population to three historical matrilineage that spread out during the late Pleistocene and that the species has at least two contemporary genetic stocks homogeneously co-distributed in the northern and southern hemispheres.

Different genetic stocks within a species are usually defined by where they feed and breed. But in Humboldt squids, DNA markers showed no north-south divide. The equator

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How the Humboldt squid’s genetic past and present can secure its future

How the Humboldt squid's genetic past and present can secure its future
A paralarva of the Humboldt squid. These cephalopods emerge from their eggs as one-millimeter paralarvae but grow to over 1.2 meters when they reach maturity. To sustain their growth within their one-year lifespan, these pack hunters go on a feeding frenzy, sometimes eating each other. Credit: Dr. Mitsuo Sakai

A group of marine biologists is pushing for more international collaboration to manage the Humboldt squid population after their study to identify its genetic stocks revealed its vulnerability to overfishing by fleets trying to feed the world’s hunger for squids.


Hiroshima University marine biologist Gustavo Sanchez led a team of researchers to find out the genetic structure of the Humboldt squid population in the Eastern Pacific Ocean using two types of DNA markers—the mitochondrial ND2 gene and nuclear microsatellite loci.

The team found that Humboldt squids could trace back their population to three historical matrilineage that spread out during the late

Read More
Read More