The geoduck (pronounced gooey-duck), Panopea generosa, is a species of very large, edible, saltwater clam in the family Hiatellidae, native to the west coast of North America and especially abundant in the Pacific Northwest - Washington state and British Columbia. The geoduck is the largest species of burrowing clam in the world: the shell of the clam ranges from 15 cm (5.9 in) to over 20 cm (7.9 in) in length. In addition, its extremely long siphons, through which the underground clam draws in and expels marine water from above the substrate in order to filter feed on phytoplankton, can be more than 1 m (3.3 ft) in length, far to big to retract into the shell like other clams. They usually live subtidally, from the 0 tide line to depths of 110 m (360 ft) of water, and buried as deep as their siphons allow in mud, sand or silt; in Puget Sound the tips of their siphons are only exposed at very low tides. Geoducks are also one of the longest-lived animals of any type, living up to 168 years (Bureau et al. 2002; Orensanz et al. 2003). As adults they have very few predators other than humans. The common name is thought to be derived from the Nisqually Native American word gwídeq meaning "dig deep," and has multiple spellings; likewise they have acquired multiple scientific synonyms through their complicated taxonomic history, including the often used P. abrupta (Vadopalas 2010; Washington Department of Fish and Wildlife 2013).
In the 1970s a commercial fishery for geoduck clams opened up and in recent decades a huge demand from Asian markets has developed. These clams are now farmed as well as harvested in the wild. The clams currently sell for huge sums of money, in China they fetch more than US$150/pound (US$330/kg; Welch 2012) and now require policing by the Washington Dept. of Fisheries and Wildlife for illegal harvesting (Vedder 2011; Welch 2012). Farming techniques are under scrutiny for their possible negative environmental impact (e.g. Ruesink and Rowell 2012; Brown and Thuesen 2011; Orensanz et al. 2004; Washington Sea Grant 2013).
- Brown, R.A. and Thuesen, E.V. Biodiversity of Mobile Benthic Fauna in Geoduck (Panopea generosa) Aquaculture Beds in Southern Puget Sound, Washington. Journal of Shellfish Research 30(3):771-776. 2011 doi: http://dx.doi.org/10.2983/035.030.0317
- Bureau, D., Hahas, W., Surry, N.W., Hand, C.M., Dovey, G., and Campbell, A. 2002. Age, size structure and growth parameters of geoducks (Panopea abrupta Conrad 1849) from 34 locations in British Columbia sampled between 1993 and 2000. Can. Tech. Rep. Fish. Aquat. Sci. No 2413: 84 p.
- Orensanz, J. M. L., C. M. Hand, A. M. Parma, J. Valero, and R. Hilborn. 2004. Precaution in the harvest of Methuselahs clams-the difficulty of getting timely feedback from slow-paced dynamics. Can. J. Fish. Aquat. Sci. 61:1355-1372.
- Ruesink, J. L. and Rowell, K. 2012. Seasonal effects of clams (Panopea generosa) on eelgrass (Zostera marina) density but not recovery dynamics at an intertidal site. Aquatic Conserv: Mar. Freshw. Ecosyst., 22: 712–720. doi: 10.1002/aqc.2269
- Vadopalas B., Pietsch T.W. & Friedman C.S. (2010) The proper name for the geoduck: Resurrection of Panopea generosa Gould, 1850, from the synonymy of Panopea abrupta (Conrad, 1849) (Bivalvia: Myoida: Hiatellidae). Malacologia 52(1): 169-173
- Vedder, Tracy (March 3, 2011). "Chinese mafia rakes in millions from 'Puget Sound gold'". KOMOnews.com. Retrieved 8 August 2013.
- Washington Department of Fish and Wildlife, 2013. Geoduck clams. Retrieved August 8, 2013 from http://wdfw.wa.gov/fishing/shellfish/geoduck/
- Washington Sea Grant, 2013. Current Geoduck research. Retrieved August 8, 2013 from http://www.wsg.washington.edu/research/geoduck/current_research.html
- Welch, Craig, 2012. NW geoducks fetch top dollar in China, and as prices soar, so do concerns about illegal harvesting in Puget Sound, Seattle Times, April 22, 2012, pp 1 & 10.
Catalog Number: USNM 3480
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Locality: San Francisco, California, United States, North Pacific Ocean
- Syntype: Dall, W. H. 1898. Trans. Wagner free Inst. Sci. Philad. 3(4): 831.
Molecular Biology and Genetics
The geoduck (// "gooey duck"), scientific name Panopea generosa, is a species of very large, edible, saltwater clam in the family Hiatellidae. The common name is derived from a Lushootseed (Nisqually) word gʷídəq.
The geoduck is native to the west coast of North America. The shell of the clam ranges from 15 centimetres (5.9 in) to over 20 centimetres (7.9 in) in length, but the extremely long siphons make the clam itself much longer than this: the "neck" or siphons alone can be 1 metre (3.3 ft) in length. The geoduck is both one of the largest clams in the world, and one of the longest-lived animals of any type.
The name of this clam (// "gooey duck") is derived from a Lushootseed (Nisqually) word gʷídəq either a word composed of a first element of unknown meaning and əq meaning "genitals" (referring to the shape of the clam), or a phrase meaning "dig deep". Alternate spellings include gweduc, gweduck, goeduck, and goiduck. It is sometimes known as the mud duck, king clam, or when translated literally from Chinese, the 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 the scientific literature.
Native to the west coast of Canada and the northwest coast of the United States (primarily Washington and British Columbia), these marine bivalve mollusks are the largest burrowing clams in the world, weighing in at an average of 1.5 pounds (0.68 kg) at maturity, but specimens weighing over 15 pounds (6.8 kg) and as much as 2 meters (over 6.5 ft) 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 100 tonnes 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.
Geoducks are one of the longest-living organisms in the animal kingdom. The oldest recorded specimen was 168 years old, but individuals over 100 years old are rare. 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 predators, which may also contribute to their longevity. In Alaska, sea otters and dogfish have proved capable of dislodging geoducks; starfish also attack and feed on the exposed geoduck siphon.
Geoducks are broadcast spawners. A female geoduck produces about 5 billion eggs in her century-long lifespan—in comparison, a human female produces about 500 viable ova during the course of her life. 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. In the Puget Sound, studies indicate that the recovery time for a harvested tract is 39 years.
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. This estimate is used to predict the two percent allowed for commercial harvesting.
The world's first geoduck fishery was created in 1970, but demand for the half-forgotten clam was low due to its texture. As of 2011[update], these clams sell in China for over $150/lb (US$330/kg).
The geoduck's high market value has created an $80-million US industry, with harvesting occurring in the states of Alaska, Washington, and Oregon and the 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.
As of 2007[update], 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 advancement has meant that 90 percent of clams were delivered live to market in 2007. In 2001, only 10 percent were live. Because geoduck have a much higher market value live—an additional $2 to $3 per pound—this development has helped to stimulate the burgeoning industry.
|This section lends undue weight to certain ideas, incidents, or controversies. (October 2012)|
Investigation of environmental impacts is just now[when?] beginning to occur. Demand has also led to a rapidly developing aquaculture industry. Geoduck aquaculture on private tidelands in Puget Sound, particularly in South Puget Sound, has been steadily growing over the last ten years, averaging about 10 new acres of cultivation per year. Currently less than 0.001% of Puget Sound is dedicated to geoduck farming. Geoduck farms use "predator exclusion devices" in which to plant the seed geoducks. These devices are PVC pipes 10 to 14 inches (250 to 360 mm) long, 4 to 6 inches (100 to 150 mm) in diameter, pushed into the tideland sediment. There are approximately 20,000 to 43,500 of these PVC pipes planted per 1 acre (0.40 ha) on tidelands. These nursery tubes typically stay in the beach for the first year or two of a crop cycle.
The Environmental Defense Fund has done extensive studies of aquaculture and has found that bivalves (oysters, mussels, and clams) are beneficial to the marine environment. The water must be certifiably clean to plant geoducks commercially. This is a requirement of the Washington State Department of Health Office of Shellfish and Water Protection and of the Interstate Shellfish Sanitation Council.
Geoduck farming grow-out and harvest practices are highly controversial. These practices have created serious conflicts with shoreline property owners; concerns from nongovernmental organization (NGOs) (e.g., Tacoma Audubon and Sierra Club); and others simply interested in the health of Puget Sound. The shoreline development groups have expressed concerns including lack of regulation, aesthetics, effects on native geoduck populations, impacts on wildlife, farm debris, intensive farming/harvest techniques, agricultural densities of geoducks, carrying capacity of low-flushing inlets, near-shore habitat destruction, over enrichment of sediments from intensive shellfish bio deposits and the permanent conversion of natural ecosystems to intensive commercial agricultural use on the tidelands of Puget Sound. Shoreline developers are particularly concerned because they see shellfish farming as an impediment to continued bulkheading, upland deforestation and septic tank installation. The main objectives of the newly created Puget Sound Partnership include habitat preservation, habitat restoration, preservation of biodiversity and recovery of imperiled species (salmon).
As mandated by 2007 legislation, the Washington State Shellfish Aquaculture Regulatory Committee stakeholder group, including industry, agency and citizen representatives has convened to discuss regulation of this industry. Counties such as Pierce County have also begun to develop regulations covering tideland impacts from geoduck farming, something against which Taylor Shellfish has filed a suit.
Although some marine shoreline owners take issue with the visual impacts, a more important concern is their impact on the marine environment. Concerns arise over the use of PVC tubes, as poorly maintained farms may lose tubes, which can end up in subtidal areas, uncollected. Attempts to have industry mark tubes identifying the grower have been met with strong resistance.
Geoducks are farmed in the intertidal zone, resulting in the farming operation's being visible only 2–3% of daylight hours. However, since the lowest tides in the summer are during mid-day, the visual and recreational impact of the tubes is greatest at the very time when the people of Puget Sound are likely to be using the beach. During summer, a citizen group shows that the average percentage of time during daylight hours that the farms are visible is 19% per day and the number of days from Memorial Day weekend to Labor Day that farms are visible some portion of the day is 76%. This is calculated for geoducks planted to a +2 tidal level in Thurston County, Washington, one of the counties of South Puget Sound. When calculated for a +3 tidal elevation (where geoducks are never farmed), the amount of visibility rises to an average per day of 23% of daylight hours and 87% of the days of the summer.
Impacts on tideland include placing as many as 44,000 PVC pipes per acre on privately held tidelands; removal of this "artificial reef" one to three years later; then harvest after five to six years. While these practices may have short-term impacts to the tidelands, these impacts are not nearly as great as the documented impacts from upland residential development including bulkheading of the shoreline (disrupting the natural beach creation process), deforestation of the upland (creating increased storm water run-off) and placing of septic systems in the shoreline habitat (creating nitrogen loading of the coastal waters). Fortunately, these upland impacts are readily dealt with through enforcement of existing regulations. Unfortunately, there are no meaningful regulations controlling geoduck farming and whatever the tideland impacts may be, whether short-term or long-term.
A January 2008 Washington Sea Grant paper, commissioned by the state of Washington to determine what studies existed on Geoduck aquaculture, found virtually no peer-reviewed research existed. Studies have been funded to determine short- and long-term environmental and genetic impacts. In southern Puget Sound, research has shown that the effect of geoduck farming on large mobile animals is ambiguous.
In Puget Sound, subtidal densities in the wild (0.3 individuals per square foot or fewer) are below farmed densities of ~2 geoducks per square foot. Each year new hatchery brood stock is taken from the wild stock. Farmed animals are not used as brood stock so genetically, farmed geoduck are the same as wild stocks. Moreover, wild geoduck occupy the intertidal zone down to 300 feet (91 m) below sea level. DNR and the tribes comanage the wild fishery and only harvest geoduck between the 18-to-70-foot (5.5 to 21.3 m) depths. The annual leased harvest of the wild geoduck population by the Washington State Department of Natural Resources Geoduck Fisheries Program is about 4,000,000 pounds (1,800,000 kg) a year.
Wildlife interactions are a concern and geoduck growers are adapting growing techniques to minimize these effects. A 2004 draft biological assessment, commissioned by three of the largest commercial shellfish companies in the Puget Sound region, examined the impacts of geoduck farming and identified no long-term effects on threatened or endangered species.
Farm debris includes displaced net tops, rubber bands, and PVC tubes. The net tops used on the nursery pipes can come off and float away onto other beaches as debris and the rubber bands also can become debris in Puget Sound. To offset these environmental impacts, most geoduck farmers have embraced environmental codes of practice including regular maintenance and debris clean-up of their own farms. In addition, the industry now does two annual beach cleanups to collect marine debris from all beaches in areas where they farm. Although as much as 20% of the debris collected in each cleanup has been aquaculture related, less than 5% of the 120 cubic yards (92 m3) collected to date has been related to geoduck farming. Unfortunately, because of the currents in Puget Sound, nets and tubing can be found far from any poorly maintained geoduck operations. This lack of control over loose gear remains a significant enough problem that bonding requirements are being considered as part of regulations being developed.
Harvesting takes place every four to six years. Water pressure hoses using up to 50 US gallons (190 l) per minute are used to extract the geoducks buried under 2–3 feet (0.61–0.91 m) of sediment depth. There are no environmental impact studies related to intertidal harvest of geoduck As of August 2006[update], although the subtidal environmental impact studies done for the fisheries in BC and WA have found no detrimental effects in harvesting the clams. Geoduck farming is conducted in clean, uncontaminated sediments only, so concern is limited to short-term increases in turbidity and short-term effect on benthic organisms. The Department of Natural Resources of Washington State conducted the environmental impact study. DNR is itself in the business of leasing subtidal lands for commercial geoduck harvest and starting this year, intertidal lands for commercial geoduck farming.
The large, meaty siphon is prized for its savory flavor and crunchy texture. Geoduck is regarded by some as an aphrodisiac because of its phallic shape. A team of American and Italian researchers analyzed bivalves and found they were rich in amino acids that trigger increased levels of sex hormones. Their high zinc content aids the production of testosterone. 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 menus in cheaper sushi restaurants, geoduck is sometimes substituted for Tresus keenae, a species of horse clam, and labeled mirugai or mirukuigai. It is considered to have a texture similar to an ark shell (known in Japanese as akagai). Mirugai is sometimes translated into English as "giant clam", and it is distinguished from himejako sushi, which is made from Tridacna gigas.
In December 2013, China imposed an indefinite ban of geoduck and other "double-shell aquatic animals" – such as clams, oysters, mussels, and scallops – that were imported from the west coast of the United States. Chinese officials claimed to have found in an Alaskan shipment high levels of paralytic shellfish poisoning, a biotoxin that shellfish can accumulate, which when eaten by humans, can cause severe illness or even death. Companies exporting the product claim that Chinese inspectors were using a standard more rigorous than considered safe for human consumption. A shipment from Washington state was high in arsenic. Some 90% of the geoduck catch is exported to China, leading to fears of layoffs for divers and other workers involved in the operations. The National Oceanic and Atmospheric Administration (NOAA) is in negotiations with China's government to reopen trade.
In popular culture
- Writer/director James Gunn has said that the geoduck was an inspiration for the slug-like alien parasites in his horror/comedy Slither (2006).
- A documentary about geoducks, 3 Feet Under: Digging Deep for the Geoduck Clam, won the best documentary award at the Thunderbird International Film Festival.
- On the 24th episode of the YouTube web-show, Wreckless Eating (uploaded on June 1, 2012), Matt Zion, Chris Wreckless, and Chelsea try the geoduck along with a "load of weird foods", which include starfruit, bitter melon, capers in salt, almond extract, salted fish/plum/octopus and wasabi abura (aka horseradish oil).
- The geoduck is the official mascot of The Evergreen State College, located at the southernmost tip of Puget Sound in Olympia, Washington. The school's Latin motto, Omnia Extares (or, "let it all hang out") is at least partially intended as a tongue-in-cheek reference to the creature's phallic appearance.
- In the book The Egg and I the author, Betty MacDonald, describes the geoduck as a delicacy to local tribes, but says she herself does not enjoy it.
- Canadian children's entertainer Fred Penner has a song titled The Gooey Duck Song, which refers to the process of digging geoducks.
- Geoducks were frequently referenced on Seattle-based sketch comedy series Almost Live!
- Geoduck was featured on Anthony Bourdain: No Reservations on the Travel Channel in the "Pacific Northwest" episode. In it Anthony Bourdain, the host, helps catch geoducks and is then treated to an impromptu meal of geoduck on the beach.
- Episode 3 of the first season of Bizarre Foods America on Travel Channel, set in Seattle, features host Andrew Zimmern following the process of geoduck farming. He later assists in the harvest of a full-grown specimen on the tidal beaches of Puget Sound.
- On the show Chopped, geoduck was one of the four required ingredients for the first round of the first Chopped Grand Championship episode.
- Geoduck was used in a salad on the show Dinner: Impossible, wherein host Robert Irvine cooked for the Winter X Games.
- The mockumentary Love Mussel (2001) tells the story of actor Kevin Smith covering the story of a small town in New Zealand following the discovery that the geoduck, a local shellfish, has similar effects to Viagra.
- A geoduck farm was featured in season 3, episode 24 the American Discovery Channel television show Dirty Jobs with Mike Rowe, on July 18, 2006, which features host Mike Rowe harvesting geoduck clams in Puget Sound.
- A 2012 episode of Dragon's Den features a pitch regarding geoducks.
- In Fish Hooks: "Sixteen Clamandles", one of Clamantha's relatives is a gooey duck.
- It was used by Challenger Cosentino in the Iron Chef America challenge, "Symon vs. Cosentino" (season 7, episode 4).
- Geoduck was used as part of an exotic protein challenge on episode six of Top Chef Masters season 2 and the first episode of Top Chef season 3; also, it was one of the protein options on the second episode of Top Chef season 10 during the Quickfire Challenge, as well as the second episode of Top Chef Duels.
- Used in Season 1 of Top Chef Canada, during the Quickfire Challenge, when one contestant selected the item, and the contestants were surprised by being asked to use the ingredients of the contestant next to them instead of their own selection. The Chef (Rob) who was forced to use the geoduck, and hated using it, ended up winning the challenge.
- In a 2009 episode of Will Work for Food celebrity chef Adam Gertler helped harvest, weigh, and prepare geoducks.
- Featured on Food Network's The Great Food Truck Race August 25, 2013 episode.
- In the first season of Men in Trees, Jack gives Marin a geoduck shell she wears as a bracelet.
- Featured on Food Network's Cutthroat Kitchen.
- Used as the main ingredient in the team challenge on Hell's Kitchen (season 13, episode 2), to create 15 200g plates of geoduck sashimi.
- Panopea generosa Gould, 1850. Retrieved through: World Register of Marine Species on 28 December 2010.
- Vadopalas, B.; T. W. Pietsch & C. S. Friedman (2010). "The proper name for the geoduck: resurrection of Panopea generosa Gould, 1850, from the synonymy of Panopea abrupta (Conrad, 1849) (Bivalvia: Myoida: Hiatellidae)". Malacologia 52 (1): 169–173. doi:10.4002/040.052.0111. Retrieved 2 March 2012.
- "Geoduck". Dictionary.com. Retrieved 2007-03-29.
- American Heritage Dictionary
- Oxford English Dictionary, 3rd edition (March 2012), s.v. "geoduck" (subscription required).
- A. Campbell, R. M. Harbo, and C. M. Hand, "Harvesting and distribution of Pacific Geoduck Clams", Proceedings of the North Pacific Symposium on Invertebrate Stock Assessment and Management (1998), p. 350.
- "Geoduck Annual Report". Aquaculture Research Program, Washington Sea Grant. October 2010. Retrieved April 18, 2014.
- Orensanz, J. M. L.; Hand, C. M.; Parma, A. M.; Valero, J.; Hilborn, R. (2004). "Precaution in the harvest of Methuselahs clams-the difficulty of getting timely feedback from slow-paced dynamics". Can. J. Fish. Aquat. Sci. 61: 1355–1372.
- Georgina Willner. "The Potential Impacts of the Commercial Geoduck (Panope generosa) Hydraulic Harvest Method on Organisms in the Sediment and at the Water-Sediment Interface in Puget Sound", Master's Thesis, The Evergreen State College, Olympia, Washington, June 2006.
- David Palazzi, Lynn Goodwin, Alex Bradbury, Bob Sizemore, Leigh Espy, Susan Sturges, Candis Ladenburg, and Blanch Sabottke. "FINAL Supplemental Environment Impact Statement (S.E.I.S.) for The Puget Sound Commercial Geoduck Fishery", Washington State Department of Natural Resources and Washington State Department of Fish and Wildlife, May 23, 2001. p. 135.
- Rumble, JM; Hebert, KP; Siddon, CE (2012). "Estimating Geoduck Harvest Rate and Show Factors in Southeast Alaska". In: Steller D, Lobel L, eds. Diving for Science 2012. Proceedings of the American Academy of Underwater Sciences 31st Symposium. Retrieved 2013-09-29.
- Vedder, Tracy (March 3, 2011). "Chinese mafia rakes in millions from 'Puget Sound gold'". KOMOnews.com. Retrieved 6 March 2011.
- 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, April 22, 2012, pp 1 & 10.
- Dunagan, Christopher. "Poaching hurts geoduck population growth". Kitsap Sun. Retrieved 2012-06-05.
- Ess, Charlie. "Toxin test gives live market a boost; quota also gets a significant bump". National Fisherman. Retrieved 2008-08-01.
- Goldburg, Rebecca et al. (2001), "Marine Aquaculture in the United States", Environmental Defense for Pew Oceans Commission.
- Commercial Shellfish Licensing & Certification Program, Washington State Department of Health Office of Shellfish and Water Protection, retrieved 2009-05-08
- Geoduck aquaculture in South Puget Sound
- "Protect Our Shoreline". Protect Our Shoreline. 2000-07-12. Retrieved 2012-06-05.
- "APHETI-Association to Protect Hammersley, Eld and Totten Inlets". Apheti.com. Retrieved 2012-06-05.
- Save Our Shoreline
- "Responsible Shellfish Farming BC". Responsibleshellfishfarming.ca. Retrieved 2012-06-05.
- Henderson Bay Shoreline Association
- About the Partnership, Puget Sound Partnership, retrieved 2009-05-08
- Shellfish Aquaculture Regulatory Committee, Washington State Department of Ecology
- 2007 Shellfish Aquaculture Bill, SHB 2220
- Geoduck Farm Visibility Chart
- "Streaming Video - Geoduck Research Program". Washington Sea Grant. 2009-10-27. Retrieved 2012-06-05.
- "Current Geoduck Research". Washington Sea Grant. Retrieved 2012-06-05.
- Brown, R. A.; Thuesen, E. V. (2011). "Biodiversity of mobile benthic fauna in geoduck (Panopea generosa) aquaculture beds in southern Puget Sound, Washington". Journal of Shellfish Research 30: 771–776.
- WDFW - Commercial Puget Sound Geoduck Regulations[dead link]
- Washington State Department of Natural Resources Geoduck Fisheries Program[dead link]
- King of Clams
- "Pearly wisdom: oysters are an aphrodisiac". The Sydney Morning Herald. 2005-03-24.
- Kurlansky, Mark (2006). The Big Oyster: History on the Half Shell. New York: Ballantine Books. ISBN 0-345-47638-7.
- Coral Garnick (20 December 2013). "State closes geoduck harvest area after China ban". The Seattle Times. Retrieved 21 December 2013.
- Jay Greene (14 December 2013). "Geoduck industry fighting China's shellfish-import ban". The Seattle Times. Retrieved 17 December 2013.
- Ashley Ahearn; Katie Campbell; Anthony Schick (12 December 2013). "China Imposes First-Ever West Coast Shellfish Ban". KUOW-FM. Retrieved 17 December 2013.
- "Duckumentary home". Duckumentary.com. Retrieved 2012-06-05.
- "Love Mussel". IMDb. 2001.
- "Episode Guide:Dirty Jobs". Dsc.discovery.com. Retrieved 2012-06-05.
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