Argentine squid, also known as "Argentine squid". Cephalopoda, squid family. The carcass is conical. There is no membrane outside the orbit. The shallow acupoints in the front of the funnel pit were smooth without longitudinal folds and side cysts. The length of the fleshy fin is about 1 / 3 of the length of the carcass. The length of the sessile wrist is generally 3 ˃ 2 ˃ 4 ˃ 1, with two rows of suckers. The horny ring has a big sharp tooth and more than 10 nearly semicircular teeth around it. The fourth pair of carpals on the right or left side of the male is stemmed. There are 4 rows of suckers in the middle, semicircular teeth in the cuticle ring of the middle large sucker, and 8 rows of small suckers at the top. The maximum carcass length was 0.33 m and the maximum body weight was 1 kg. It is mainly distributed in the continental shelf and continental slope of the southwest Atlantic Ocean. It has been developed by fishing vessels of Japan, South Korea, China, Argentina and other countries, with an annual maximum output of 1 million tons. For fresh food, but also dry products
The body is conical in shape, obviously thin and narrow at the back. The length of the carcass is about 4 times of the width of the carcass. The widest part of the coat is located in the middle of the coat. The coat muscles are strong and there are nearly circular pigment spots on the body surface. The shallow pit of funnel depression is completely smooth without longitudinal fold and side sac. The length of the fin is 42% of the carcass length, the width is 57% of the carcass length, and the single fin angle is 45 ° to 55 °. There are 4 rows of suckers on the palms of the tentacles, which are large in the middle and small in the margin. There are 8 rows of small suckers in the finger. The cuticle ring of the big sucker in the middle of the palm has semicircular teeth. The length of each wrist is similar, and the wrist type is generally 3 ˃ 2 ˃ 4 ˃ 1. The second and third pairs of wrists in male are significantly thicker than those in female, and the sucker is also significantly enlarged. The sucker is arranged in two rows, with a large sharp tooth in the horny ring and 10 semicircular teeth around it. In males, the distal 1 / 2 of the 4th wrist on the right or left side is stemmed, and the sucker is specialized into two rows of mastoid. The inner shell is horny, narrow strip, thin axis, thick ribs, and hollow narrow rhomboid tail vertebrae at the back end.
It is distributed in the frontal slope of the southwest Atlantic continental shelf from 22 ° s to 54 ° s.
They inhabit the surface water depth to 800 m, and the population density is 50-200 m in the continental shelf in autumn and winter. The life cycle is 1-2 years. It mainly feeds on crustaceans, fishes and cephalopods. The crustaceans include longicopods, carinates, krill and Chaetognatha; the fish mainly include the larval COD and lantern fish; the cephalopods are mainly Argentinean skater, Patagonian squid, etc. Cephalopods are more important in the diet of larger individuals, and are themselves prey to carnivorous fish, marine mammals and seabirds.
The population structure is rather complex. According to the spawning time, growth rate and the spatial and temporal distribution of larvae, they can be divided into four groups: spring, summer, autumn and winter. The spawning period runs through the whole year, and reaches the peak in winter (May to August). According to body size, carcass length at maturity and spatial and temporal distribution of spawning grounds, it can be divided into four formations: southern Patagonia population, Buenos Aires Patagonia northern population, summer spawning group and spring spawning group.
