Humboldt Squid

Humboldt Squid battle analysis

The Humboldt squid is a short-lived, fast-growing predator that makes up for its soft body with speed, weapons and numbers. A large adult has a mantle about a metre long and weighs around 25 kg. When it attacks, two elastic tentacles shoot out almost too fast to film, gripping prey with suckers ringed by hard protein teeth and pulling it to a beak so hard and stiff that materials scientists study it.

It lives by a daily commute. By day it sinks into the ocean's oxygen-poor layer, hundreds of metres down; by night it rises to hunt. There it gathers in shoals of up to 1,200, and sonar shows small groups breaking away to spiral upward together after fish. The squid communicate with rapid red-and-white flashes and patterns that they light from inside with tiny photophores, a way of signaling in near-total darkness.

In a battle the Humboldt squid is a genuine glass cannon. Its tentacle strike is quick and its beak and toothed suckers can shred fish, and it is famous for aggression, even toward its own injured shoal-mates. But a 25 kg animal with no shell cannot absorb much punishment, and against large, well-armed opponents its best weapon is its speed in escaping.

Habitat & range

Humboldt squid live in the eastern Pacific from Tierra del Fuego to California, mostly at depths of about 200 to 700 m, and have been spreading north into the waters of Oregon, Washington, British Columbia and Alaska (Wikipedia). They spend daytime in deep, oxygen-poor water and move toward the surface at night (Rosa & Seibel 2009).

Diet & hunting

They are voracious carnivores, eating small fish, crustaceans and other squid, including their own species. In a study of more than 2,000 squid caught off Chile, other Humboldt squid were the most common prey (Wikipedia). Off Peru, small-, medium- and large-sized groups overlap in some habitats and divide food in others (Zhao et al. 2023).

Social life

Humboldt squid gather in shoals of up to 1,200 animals (Wikipedia). At night, small subgroups break away and hunt in coordinated spirals (Benoit-Bird & Gilly, via Deep Sea News). They communicate with pigment patterns and flashes shown selectively in foraging and social contexts (Burford & Robison 2020).

Conservation

The IUCN Red List classes the Humboldt squid as Data Deficient (as summarized by Wikipedia). It supports the most important squid fishery in the world, landed mainly in Chile, Peru and Mexico; the Gulf of California fishery collapsed in 2015 during warm-water conditions and had not recovered (Wikipedia). Warmer, more acidic water reduces its metabolic performance (Rosa & Seibel 2009).

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