Largest one ever recorded I think was the one Colossal squid caught in New zealand.  The specimen was initially estimated to measure about 10 meters in total length and weigh about 450 kg. New Zealand already has other giant squid specimens to study from, which is why the team only biopsied scientifically valuable parts of the animal. They are believed to be solitary hunters, as only individual giant squid have been caught in fishing nets. Cephalopods of the world.  Maximum total length, when measured relaxed post mortem, is estimated at 12 m (39 ft) or 13 m (43 ft) for females and 10 m (33 ft) for males from the posterior fins to the tip of the two long tentacles. It seems the species has a much more aggressive feeding technique. As in other squid, these glands produce a gelatinous material used to keep the eggs together once they are laid..  It is known to inhabit the circumantarctic Southern Ocean. The specimen weighed 495 kilograms (1,091 lb) and was initially estimated to measure 4.5 metres (15 ft) in total length. In November 2006, American explorer and diver Scott Cassell led an expedition to the Gulf of California with the aim of filming a giant squid in its natural habitat. Then they bring it toward the powerful beak, and shred it with the radula (tongue with small, file-like teeth) before it reaches the esophagus. , Little is known about the reproductive cycle of giant squid. Because sperm whales are skilled at locating giant squid, scientists have tried to observe them to study the squid. Seibel 2010.  The Centro del Calamar Gigante in Luarca, Spain, had by far the largest collection on public display, but many of the museum's specimens were destroyed during a storm in February 2014.  The animal is thought to have weighed between 150 and 200 kg (330 and 440 lb). Giant squid breathe using two large gills inside the mantle cavity. Alternatively, such squid-on-squid attacks may be a result of competition for prey. Volume 2. Furthermore, colossal squid are not targeted by fishermen; rather, they are only caught when they attempt to feed on fish caught on hooks.  In general, it is safe to describe the morphology and anatomy of the colossal squid the same way one would describe any other squid. This suggests that there is but a single species of giant squid in the world. The researchers were able to locate the likely general location of giant squid by closely tailing the movements of sperm whales.  The region between the Weddell Sea and the western Kerguelen archipelago has been deemed a “hotspot” based on characteristics of the habitat. Daniel, Jack and Matthew Aplin were driving along the south coast of Wellington, New Zealand, last weekend when they got a little bit distracted. Giant squid are widespread, occurring in all of the world's oceans. Around 30 of these specimens are exhibited at museums and aquaria worldwide.  The colossal squid also has the largest eyes documented in the animal kingdom, with an estimated diameter of 30.5–40.6 cm (12–16 in). Claims of specimens measuring 20 m (66 ft) or more have not been scientifically documented. Kubodera and Mori reported their observations in the journal Proceedings of the Royal Society..  However, beaks from mature adults have only been recovered from large predators (i.e.  The Lusca of the Caribbean and Scylla in Greek mythology may also derive from giant squid sightings. The line also held a camera and a flash. Maximum weight is estimated at 275 kg (606 lb) for females and 150 kg (330 lb) for males. It was put on display on 1 March 2006 at the Darwin Centre. This differs from the method of flotation used by most fish, which involves a gas-filled swim bladder. The colossal squid, species Mesonychoteuthis hamiltoni was discovered in 1925. , Giant squid and some other large squid species maintain neutral buoyancy in seawater through an ammonium chloride solution which is found throughout their bodies and is lighter than seawater.  However, the animal in this photograph was a sick or dying Onykia robusta, not a giant squid.  Many other animals also feed on colossal squid, including beaked whales (such as the southern bottlenose whale), pilot whales, southern elephant seals, Patagonian toothfish, sleeper sharks (Somniosus antarcticus), Antarctic toothfish, and albatrosses (e.g., the wandering and sooty albatrosses).  Although the mantle was not brought aboard, its length was estimated at over 2.5 m (8 ft 2 in), and the tentacles measured 2.3 m (7 ft 7 in). This suggests giant squid and hoki prey on the same animals. The creature is now on show in a 9 m (30 ft) glass tank at the Darwin Centre of the Natural History Museum. In addition to its eight arms, the giant squid has a sharp beak it uses to kill fish. He first used the term "Architeuthus" (this was the spelling he chose) in a paper in 1857. Lumpers and splitters may propose as many as eight species or as few as one. Scientifically documented specimens have masses of hundreds, rather than thousands, of kilograms. Much of what is known about giant squid age is based on estimates of the growth rings and from undigested beaks found in the stomachs of sperm whales. Further research suggests that colossal squid are able to see bioluminescence generated by large predators that disrupt plankton when they move.  Large eyes can better detect light (including bioluminescent light), which is scarce in deep water. It was 8.62 m (28.3 ft) long and was sent to the Natural History Museum in London to be studied and preserved. By Xavier La Canna in Wellington AAP March 17, 2009 7:26am Octopus and Squid – Cephalopods on the South Coast . Commonly, beak remnants of the colossal squid are collected.  For comparison, squids typically have a mantle length of about 30 cm and weigh about 0.1–0.2 kg.  Colossal squid are also sighted often near Cooperation Sea and less near Ross Sea because of its predator and competitor, the Antarctic toothfish. The largest beak so far recovered is 49mm long, but the immature female O'Shea dissected in 2003 had a beak 38mm long and a body length of 2.5 …  The squid was close to dead when it was captured and subsequently was taken back to New Zealand for scientific study. An annotated and illustrated catalogue of species known to date. NEW Zealand fishermen in the Ross Sea have caught what's thought to be the largest squid ever found, weighing an estimated 450kg. The circumference of these suckers is lined with sharp, finely serrated rings of chitin. Your playlist will load after this ad.  In 2005, the first full alive specimen was captured at a depth of 1,625 m (5,331 ft) while taking a toothfish from a longline off South Georgia Island. Like other cephalopods, they are propelled by jet—by pulling water into the mantle cavity, and pushing it through the siphon, in gentle, rhythmic pulses. In males, as with most other cephalopods, the single, posterior testis produces sperm that move into a complex system of glands that manufacture the spermatophores. :211 The first footage of live (larval) giant squid ever captured on film was in 2001.  The carpus has a dense cluster of cups, in six or seven irregular, transverse rows. That's a direct consequence of fishing activity. , By the turn of the 21st century, the giant squid remained one of the few extant megafauna to have never been photographed alive, either in the wild or in captivity. , The species was first discovered in the form of two arm crowns found in the stomach of a sperm whale in the winter of 1924–1925.  This species, then named Mesonychoteuthis hamiltoni, was formally described by Guy Coburn Robson 1925. The circulatory system is closed, which is a distinct characteristic of cephalopods. Yet the colossal squid had the biggest eyes of any known animal. ", "Is it a boy? The first image of a live mature giant squid was taken on 15 January 2002, on Goshiki beach, Amino Cho, Kyoto Prefecture, Japan. , Based on the examination of 130 specimens and of beaks found inside sperm whales, giant squids' mantles are not known to exceed 2.25 m (7 ft 4.6 in). , Compared to the giant squid, which also exhibits deep-sea gigantism, the colossal squid is shorter, but heavier. Many species have been named in the sole genus of the family Architeuthidae, but they are so inadequately described and poorly understood that the systematics of the group is thoroughly confused. Japetus Steenstrup, the describer of Architeuthis, suggested a giant squid was the species described as a sea monk to the Danish king Christian III circa 1550. Particularly, of the family Cranchiidae, the colossal squid is the only squid with hooks, swivelling or three-pointed, equipped on its arms and tentacles. , Pliny the Elder, living in the first century AD, also described a gigantic squid in his Natural History, with the head "as big as a cask", arms 30 ft (9.1 m) long, and carcass weighing 700 lb (320 kg).  However, they later opted for the more conventional approach of thawing the specimen in a bath of salt water.  Specimens are rare in tropical and polar latitudes. Reports of specimens reaching and even exceeding 20 m (66 ft) are widespread, but no specimens approaching this size have been scientifically documented. & P. Jereb (2010). For example, a specimen washed ashore in Thimble Tickle Bay, Newfoundland, on 2 November 1878; its mantle was reported to be 6.1 m (20 ft) long, with one tentacle 10.7 m (35 ft) long, and it was estimated as weighing 1 short ton (0.9 t). The photo sequence, taken at a depth of 900 metres (3,000 ft) off Japan's Ogasawara Islands, shows the squid homing in on the baited line and enveloping it in "a ball of tentacles". Larger and more fearsome-looking than giant squid, colossal squid (Mesonychoteuthis hamiltoni) may frequent New Zealand’s southern waters. The expedition that was a decade in the making involved two New Zealanders. , Like all squid, a giant squid has a mantle (torso), eight arms, and two longer tentacles (the longest known tentacles of any cephalopod). Eyewitness accounts of other sea monsters like the sea serpent are also thought[by whom?] The length of time between strandings is not known, but was proposed to be 90 years by Architeuthis specialist Frederick Aldrich. It was captured and tied to a quay, where it died overnight. A squid found in New Zealand had the biggest what ever seen . 55 beaks of colossal squids have been recorded in total. , Giant squid exhibit sexual dimorphism. The incident is the second to be documented among Architeuthis recorded in Spain, with the other occurring in Villaviciosa. In 2003, a complete specimen of a subadult female was found near the surface with a total length of 6 m (20 ft) and a mantle length of 2.5 m (8 ft 2 in).  In 1981, an adult specimen was discovered, and in 2003 a second specimen was collected.  Some of the largest individuals measured 43 feet (13 metres) for males, and 59 feet (18 metres) for females, rivalled in size only by Mesonychoteuthis hamiltoni (colossal squid), which has a length of about 39–45 feet (~13 metres), one of the largest living organisms.  Young squid are thought to spawn near the summer time at surface temperatures of -0.9 to 0 degrees Celsius..  Additionally, the colossal squid has a high possible fecundity reaching over 4.2 million oocytes which is quite unique compared to other squids in such cold waters. Evidence in the form of giant squid stomach contents containing beak fragments from other giant squid in Tasmania also supports the theory that the species is at least occasionally cannibalistic.