Doryteuthis gahi

Doryteuthis gahi, also known as the Patagonian longfin squid and Patagonian squid (Spanish: calamar patagónico), is a small-sized squid belonging to the family Loliginidae. It occurs in coastal waters in the southeastern Pacific Ocean and the southwestern Atlantic Ocean where it is caught and eaten for food.

Description
The Patagonian squid is a small species and has a mantle length of 10 to 15 cm and a weight of between 75 and 150 g. The mantle is somewhat elongated and on either side at the posterior end are rhomboidal fins, rather less than half the length of the mantle. At the anterior end are four pairs of arms and a pair of tentacles. The third and fourth pairs of arms are longer than the others, and in males, the left fourth arm is heterodactylised near its tip. The tentacles are long and slender, each terminated by a club-shaped "manus" with small, narrow suckers at the edge and slightly larger ones at the centre.

Distribution
This squid occurs in the southeastern Pacific Ocean and the southwestern Atlantic Ocean. In the Pacific, its range extends along the coast from southern Peru to southern Chile, and in the Atlantic, from the San Matías Gulf in Argentina southwards to Tierra del Fuego, including the continental shelf around the Falkland Islands. It is an open-water species with a depth range from the surface down to about 350 m.

Biology
Little is known of the biology of this species, but like all squid, it is a predator. Prey items are caught by the tentacles, grasped and moved to the mouth with the help of the arms, and then chewed by the horny beak. In Chile, spawning grounds have been identified at depths of between 10 and 15 m. Fragile egg masses some 25 mm long containing about 15 embryos have been found among stems of the kelp Lessonia trabeculata, particularly in places where the algae have been heavily defoliated, suggesting that a semi-protected environment with adequate water movement is desirable. It is often a prey of Otaria flavescens, Alectis ciliaris and other predators.

Uses
In the Pacific Ocean and off Argentina, this species is mostly caught as bycatch during trawls directed at other species. There is a dedicated fishery in the Falkland Islands where it is an important target species taken from over the Patagonian Shelf. The total reported world catch in 1999 was 42505 tonnes, with the largest catch being from the Falkland Islands (22502 tonnes).