Illex argentinus

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Argentine shortfin squid
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Illex argentinus dissected in the National Museum of Natural History of Uruguay.
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Order: Oegopsida
Family: Ommastrephidae
Genus: Illex
Species:
I. argentinus
Binomial name
Illex argentinus
(Castellanos, 1960) [2]
Synonyms
  • Ommastrephes argentinus
    Castellanos, 1960

Illex argentinus, commonly known as the Argentine shortfin squid, is a species of squid in the family Ommastrephidae from the south western Atlantic Ocean.

Contents

It is one of the most commercially fished species of squid, with 511,087 tons harvested in 2002, or 23.3% of the entire squid harvest. [3]

I. argentinus is most prevalent along the coasts of South America, in Argentina, Brazil and in the Falkland Islands ( Malvinas ) in the Patagonian shelf. Some of the largest fisheries in the world are along these coasts, capturing millions of pounds of these shortfin squid a year [1] [4] .

Although they are relatively small species, they tend to form shoals, making them easy to be caught by fisheries. [5]

Physical features

The Argentine shortfin squid has a relatively strong mantle and fins. Its arms are long, with male arms significantly longer than female arms. [6]

Habitat

Argentine shortfin squid can live in a variety of depths, ranging from the surface all the way to 800 m. [1] Although the Argentine shortfin squid has a wide geographic distribution, it is an oceanic species, as they aggregate on the sea floor. They feed on other species of squid, pelagic crustaceans and crabs, shrimp, and other small fish. [7] Throughout the lifetime of an Argentine shortfin squid, many different prey of different sizes are eaten. On the other hand, predators of the Argentine shortfin squid include marine mammals, fishes, and birds. Predators and prey depend on the geographic location of the species of the Argentine shortfin squid, as they are a migratory species. The wide variety of prey and predators reflects this. During the fall and winter months, the Argentine shortfin squid is abundant on the lower shelf of the sea, at a depth of about 200 m.

Life history

Argentine shortfin squids reproduce through internal fertilization. [8] During the mating season, which lasts throughout the summer, they lay thousands of eggs on the sea floor. The eggs develop at different rates, so they do not all hatch together. They have a relatively short life span, living up to 1–2 years. The Argentine shortfin squid migrates between spawning grounds, feeding grounds, and back during their one-year life cycle. Mature squid like to migrate northward to spawning grounds, travelling closer to sea floor at night and by the surface during the day. [9] This squid is small, starting at only one millimeter and growing to a maximum body length of approximately one foot, while its tentacles are 9 inches long. After the Argentine shortfin squid reproduces once, it dies.

Industrial use

It is one of the planet's most economically significant invertebrate species. As many as 2.2 billion pounds of Argentine shortfin squid have been captured in only one fishing season. From 1988 to 2003 about 700,000 tons of Argentine shortfin squid were captured. [5] Argentine shortfin squid are so important as they make up the second largest fishery in the world by weight. [1]

Fisheries use bright lights to attract the squid to the surface at night, and then capture them with large nets. Fisheries additionally use both trawlers and jigging vessels to capture the shortfin squid. Although so many Argentine shortfin squid are removed from the coasts every year, populations bounce back, probably because of their short lifespan [8] . They are thus labeled a species of least concern. That being said, however, since 2010 stocks have steadily been declining. It is suggested that environmental changes instead of fishery impacts have caused this decline. It is essential that the nations that house this species must cooperate in order to ensure that the species is used by fisheries in a sustainable manner.

Related Research Articles

The economy of the Falkland Islands, which first involved sealing, whaling and provisioning ships, became heavily dependent on sheep farming from the 1870s to 1980. It then diversified and now has income from tourism, commercial fishing, and servicing the fishing industry as well as agriculture. The Falkland Islands use the Falkland pound, which is backed by the British pound.

<span class="mw-page-title-main">Squid</span> Superorder of cephalopod molluscs

A squid is a mollusc with an elongated soft body, large eyes, eight arms, and two tentacles in the superorder Decapodiformes, though many other molluscs within the broader Neocoleoidea are also called squid despite not strictly fitting these criteria. Like all other cephalopods, squid have a distinct head, bilateral symmetry, and a mantle. They are mainly soft-bodied, like octopuses, but have a small internal skeleton in the form of a rod-like gladius or pen, made of chitin.

<span class="mw-page-title-main">Antarctic toothfish</span> Species of fish

The Antarctic toothfish, also known as the Antarctic cod, is a large, black or brown fish found in very cold (subzero) waters of the Southern Ocean near Antarctica. It is the largest fish in the Southern Ocean, feeding on shrimp and smaller fish, and preyed on by whales, orcas, and seals. It is caught for food and marketed as Chilean sea bass together with its sister species, the more northerly Patagonian toothfish. Often mistakenly called "Antarctic cod", the Antarctic toothfish belongs to the notothen family (Nototheniidae), a family of fish genera that are abundant near Antarctica.

<span class="mw-page-title-main">Ommastrephidae</span> Family of squids

Ommastrephidae is a family of squid containing three subfamilies, 11 genera, and over 20 species. They are widely distributed globally and are extensively fished for food. One species, Todarodes pacificus, comprised around half of the world's cephalopod catch annually.

<span class="mw-page-title-main">Pelagic fish</span> Fish in the pelagic zone of ocean waters

Pelagic fish live in the pelagic zone of ocean or lake waters—being neither close to the bottom nor near the shore—in contrast with demersal fish that live on or near the bottom, and reef fish that are associated with coral reefs.

<i>Thysanoteuthis rhombus</i> Species of cephalopod known as the diamond squid or diamondback squid

Thysanoteuthis rhombus, also known as the diamond squid,diamondback squid, or rhomboid squid, is a large species of squid from the family Thysanoteuthidae which is found worldwide, throughout tropical and subtropical waters. T. rhombus is given its name for the appearance of the fins that run the length of the mantle. They are a fast growing species with a lifespan of approximately 1 year. The diamond squid is the only cephalopod species known to be monogamous. T. rhombus often preys on fish and other small cephalopods at varying water depths. This species is commercially fished in Japan, specifically in the Sea of Japan and Okinawa.

<i>Dissostichus</i> Genus of fish

Dissostichus, the toothfish, is a genus of marine ray-finned fish belonging to the family Nototheniidae, the notothens or cod icefish. These fish are found in the Southern Hemisphere. Toothfish are marketed in the United States as Chilean sea bass or less frequently as white cod. "Chilean sea bass" is a marketing name coined in 1977 by Lee Lantz, a fish wholesaler who wanted a more attractive name for selling the Patagonian toothfish to Americans. In 1994, the U.S. Food and Drug Administration (FDA) accepted "Chilean sea bass" as an "alternative market name" for Patagonian toothfish. The toothfish was remarkably successful in the United States, Europe and Asia, and earned the nickname "white gold" within the market. Toothfish are vital to the ecological structure of Southern Ocean ecosystems. For this reason, on 4 September a national day is dedicated to the toothfish in South Georgia.

<i>Todaropsis eblanae</i> Species of squid

Todaropsis eblanae, also known as the lesser flying squid, is a species of short finned squid in the monotypic genus Todaropsis of the family Ommastrephidae.

<span class="mw-page-title-main">Neon flying squid</span> Species of squid

The neon flying squid, sometimes called the red flying squid, akaika, and red squid is a species of large flying squid in the family Ommastrephidae. They are found in subtropical and temperate oceanic waters globally.

<i>Illex</i> Genus of squids

Illex, commonly known as shortfin squids, is a squid genus in the family Ommastrephidae and the only member of the subfamily Illicinae. It contains four species:

<span class="mw-page-title-main">Cephalopod beak</span> Body part of cephalopods

All extant cephalopods have a two-part beak, or rostrum, situated in the buccal mass and surrounded by the muscular head appendages. The dorsal (upper) mandible fits into the ventral (lower) mandible and together they function in a scissor-like fashion. The beak may also be referred to as the mandibles or jaws. These beaks are different from bird beaks because it crushes bone while most birds don't.

<i>Illex coindetii</i> Species of squid

Illex coindetii, commonly known as the southern shortfin squid or broadtail shortfin squid, is a species of neritic squids in the family Ommastrephidae. They are found in the Mediterranean Sea and on both sides of the north Atlantic Ocean.

<i>Illex illecebrosus</i> Species of cephalopod known as the northern shortfin squid

Illex illecebrosus, commonly known as the northern shortfin squid, is a species of neritic squids in the family Ommastrephidae. Squids of the genus Illex account for 65% of the world's cephalopod captures. Illex is formed by four taxa distributed throughout the Atlantic Ocean, whose identification and phylogenetic relationships based on morphological characters remain controversial.They are found in the northwest Atlantic Ocean, from off the coast of eastern North America to Greenland, Iceland, and west of Ireland and the United Kingdom. They are a highly migratory and short-lived species, with lifespans of less than a year. They are commercially important and are fished extensively, mostly for the Canadian and Japanese markets.

<i>Illex oxygonius</i> Species of squid

Illex oxygonius, commonly known as the sharptail shortfin squid, is a species of neritic squids in the family Ommastrephidae. Of the species of the genus Illex, they have the most restricted range, being found only in the western North Atlantic Ocean; from off New Jersey, south to the Straits of Florida and into the Gulf of Mexico. They are very difficult to distinguish from Illex coindetii and Illex illecebrosus, with which their geographic range overlaps. The most obvious difference of I. oxygnius is their sharper fin angles of 25° to 40°. There is also the possibility that they may be a hybrid of I. coindetii and I. illecebrosus.

<span class="mw-page-title-main">Fishing in the Falkland Islands</span> Falkland Islands fishing industry

Fishing in the Falkland Islands contributes to the local economy, representing one of its biggest exports.

<i>Sthenoteuthis oualaniensis</i> Species of squid

The purpleback flying squid or purpleback squid is a species of cephalopod in the family Ommastrephidae, occurring in the Indo-Pacific. It is considered one of the most abundant large squids.

<span class="mw-page-title-main">European flying squid</span> Species of squid

The European flying squid is a species of squid from the continental slope and oceanic waters of the eastern Atlantic Ocean and the Mediterranean Sea. It is the type species of the genus Todarodes, the type genus of the subfamily Todarodinae of the pelagic squid family Ommastrephidae. It is a species which is targeted by some fisheries, although it is more often a bycatch.

<i>Doryteuthis gahi</i> Species of squid

Doryteuthis gahi, also known as the Patagonian longfin squid and Patagonian squid, 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.

<i>Patagonotothen ramsayi</i> Species of ray-finned fish

Patagonotothen ramsayi, the longtail southern cod, rock cod, marujo or Notothenia, is a benthopelagic species of marine ray-finned fish of the family Nototheniidae, the notothens or the cod icefishes, native to the Patagonian Shelf in the southwest Atlantic, where it is the most abundant notothen species found, dominating among medium-sized demersal fishes in the area, and is a commercially important species.

<span class="mw-page-title-main">Uruguay - Buenos Aires Shelf marine ecoregion</span>

The Uruguay - Buenos Aires Shelf marine ecoregion covers waters offshore of Uruguay, the mouth of the Rio de la Plata), and Buenos Aires Province of Argentina. It has an area of 258,490 square kilometres (99,800 sq mi) and a coastline of 1,300 kilometres (810 mi). Marine biodiversity is very high due to the mixing of currents, the mixing of fresh and salt water, the mixing of temperatures, and the broad, shallow continental shelf. Large amounts of nutrients arrive from the northwest flowing Malvinas Current and from the continental runoff of the Rio de la Plata. Aside from high populations of fish there are colonies of marine mammals, sea turtles, and seabirds.

References

  1. 1 2 3 4 Barratt, I. & Allcock, L. (2014). "Illex argentinus". The IUCN Red List of Threatened Species . 2014: e.T163246A989453. doi: 10.2305/IUCN.UK.2014-1.RLTS.T163246A989453.en . Downloaded on 10 March 2018.
  2. Julian Finn (2016). "Illex argentinus (Castellanos, 1960)". World Register of Marine Species . Flanders Marine Institute . Retrieved 10 March 2018.
  3. Rodhouse, Paul G (2005). "Review of the state of world marine fishery resources: Fisheries technical paper". World Squid Resources (447). FAO. ISBN   92-5-105267-0.
  4. "Chinese Fishing Vessels' 'Floating Cities' Prey on Latin American Seas". Diálogo Américas. 2023-06-05. Retrieved 2024-05-17.
  5. 1 2 Chiu, Tsan-Yu; Chiu, Tai-Sheng; Chen, Chih-Shin (September 2017). "Movement patterns determine the availability of Argentine shortfin squid Illex argentinus to fisheries". Fisheries Research . 193 (1): 71–80. doi:10.1016/j.fishres.2017.03.023 via ResearchGate.
  6. Bazzino Ferreri, Gastón A.; Quiñones, Renato A.; Norbis, Walter (December 2005). "Environmental associations of shortfin squid Illex argentinus (Cephalopoda: Ommastrephidae) in the Northern Patagonian Shelf". Fisheries Research . 76 (3): 401–416. doi:10.1016/j.fishres.2005.07.005 via ResearchGate.
  7. Alvarez Perez, José, yTiago Nascimento Silva, Rafael Schroeder, Richard Schwarz, and Rodrigo Silvestre Martins (2009). "Biological patterns of the Argentine shortfin squid Illex argentinus in the slope trawl fishery off Brazil". Latin American Journal of Aquatic Research, 37(3), 409-427.
  8. 1 2 Sacau, M., Pierce, G., Wang, J., Arkhipkin, A., Portela, J., Brickle, P., Cardoso, X. (2005). The spatio-temporal pattern of Argentine shortfin squid Illex argentinus abundance in the southwest Atlantic. Aquatic Living Resources, 18(4), 361- 372.
  9. Rodhouse, Paul G.K.; Arkhipkin, Alexander I.; Laptikhovsky, Vladimir; Nigmatullin, Chingis & Waluda, Claire M. (2013). "Illex argentinus, Argentine shortfin squid". Advances in Squid Biology, Ecology and Fisheries. Part II. 23 (4): 109–148.