The Pacific geoduck ( ; Panopea generosa) is a species of very large Saline water clam in the family Hiatellidae.[ The common name is derived from the Lushootseed name, .
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The geoduck is native to the coastal waters of the eastern North Pacific Ocean from Alaska to Baja California.[ The shell of the clam ranges from to over in length, but the extremely long siphons make the clam itself much longer than this: the "shaft" or siphons alone can be in length. The geoduck is the largest burrowing clam in the world.]
Etymology
The name Geoduck is derived from the Lushootseed name for the animal, .
It is sometimes known as a mud duck, king clam or, when calque from Chinese language, an elephant-trunk clam ().
Between 1983 and 2010, the scientific name of this clam was confused with that of an extinct clam, Panopea abrupta (Conrad, 1849), in scientific literature.
Biology
Native to the west coast of Canada and the northwest coast of the United States (primarily Washington and British Columbia), these marine bivalve are the largest burrowing clams in the world, weighing in at an average of at maturity, but specimens weighing over and as much as in length are not unheard of.
A related species, Panopea zelandica, is found in New Zealand and has been harvested commercially since 1989. The largest quantities have come from Golden Bay in the South Island where were harvested in one year. There is a growing concern over the increase of parasites in the Puget Sound population of geoduck. Whether these microsporidium-like parasitic species were introduced by commercial farming is being studied by Sea Grant. Research to date does indicate their presence.
The oldest recorded specimen was 179 years old, but individuals usually live up to 140 years.[ A geoduck sucks water containing plankton down through its long siphon, filters this for food and ejects its refuse out through a separate hole in the siphon. Adult geoducks have few natural , which may also contribute to their longevity. In Alaska, and Squaliformes have proved capable of dislodging geoducks; starfish also attack and feed on the exposed geoduck siphon.
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Geoducks are broadcast spawners. A female geoduck produces about 5 billion eggs in her century-long lifespan. However, due to a low rate of recruitment and a high rate of mortality for geoduck eggs, larvae, and post-settled juveniles, populations are slow to rebound.
Biomass densities in Southeast Alaska are estimated by divers, then inflated by twenty percent to account for geoducks not visible at the time of survey.[
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Industry
The world's first geoduck fishery was created in 1970, but demand was low at first due to its texture. , these clams sell in China for over US.[Welch, Craig, 2012. NW geoducks fetch top dollar in China, and as prices soar, so do concerns about illegal harvesting in Puget Sound, The Seattle Times, 22 April 2012, pp 1 & 10.]
The geoduck's high market value has created an $80-million industry, with harvesting occurring in the US states of Alaska, Washington, and Oregon and the Canadian province of British Columbia. It is one of the most closely regulated fisheries in both countries. In Washington, Department of Natural Resources staff are on the water continually monitoring harvests to ensure revenues are received, and the same is true in Canada where the Underwater Harvesters' Association manages the Canadian Fishery in conjunction with Canada's Department of Fisheries and Oceans. The Washington State Department of Health tests water and flesh to assure clams are not filtering and holding pollutants, an ongoing problem. With the rise in price has come the inevitable problem with poaching, and with it the possibility some could be harvested from unsafe areas.
, advances in the testing system for contaminated clams have allowed geoduck harvesters to deliver live clams more consistently. The new testing system determines the viability of clams from tested beds before the harvesters fish the area. Previous methods tested clams after harvest. This advance has meant that 90 percent of clams were delivered live to market in 2007. In 2001, only 10 percent were live.
The COVID-19 pandemic disrupted the geoduck industry. Given the near-shutdown of restaurants and seafood markets across the country, demand for live geoducks plummeted. Divers in Southeast Alaska who typically see prices of for live geoducks reported prices as low as , leading many to stop fishing temporarily.
File:2009 Mollusca in Hong Kong.JPG|Seafood geoduck display in a Chinese restaurant in Hong Kong
File:Seattle - Curiosity Shop geoduck 01A.jpg|An ostensibly record-setting geoduck, Ye Olde Curiosity Shop, Seattle, Washington.
Environmental impact
Geoduck farming grow-out and harvest practices are controversial,
Culinary uses
The large, meaty siphon is prized for its umami flavor and crunchy texture. Geoduck is regarded by some as an aphrodisiac because of its phallic shape.[ It is very popular in China, where it is considered a delicacy,][ mostly eaten cooked in a fondue-style Chinese hot pot. In Korean cuisine, geoducks are eaten raw with spicy chili sauce, sautéed, or in soups and stews. In Japan, geoduck is prepared as raw sashimi, dipped in soy sauce and wasabi. On Japanese cuisine in cheaper sushi restaurants, geoduck is sometimes substituted for Tresus, a species of horse clam, and labeled or . It is considered to have a texture similar to an ark shell (known in Japanese as ). is sometimes translated into English as "giant clam", and it is distinguished from , which is made from Giant clam.
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In popular culture
The Evergreen State College in Olympia, Washington, has a geoduck as its mascot named Speedy.
Geoducks have also earned cultural interest due to their phallus appearance, status as a delicacy, and appearances in popular media.
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