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Behavior

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Alaskan king crabs communicate during mating when the female releases a chemical that signals a male that she is ready to ovulate.

Communication Channels: tactile ; chemical

Other Communication Modes: pheromones

Perception Channels: visual ; tactile ; chemical

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Kluce, M. 2004. "Paralithodes camtschaticus" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Paralithodes_camtschaticus.html
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Michael Kluce, University of Michigan-Ann Arbor
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Phil Myers, Museum of Zoology, University of Michigan-Ann Arbor
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Renee Sherman Mulcrone
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Conservation Status

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There is no special status on Alaskan king crabs. However, due to over harvesting the population of P. camtschaticus is consistently low. A proposed possible solution is that crabbers are only allowed to catch male Alaskan king crabs.

US Federal List: no special status

CITES: no special status

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Kluce, M. 2004. "Paralithodes camtschaticus" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Paralithodes_camtschaticus.html
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Michael Kluce, University of Michigan-Ann Arbor
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Phil Myers, Museum of Zoology, University of Michigan-Ann Arbor
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Renee Sherman Mulcrone
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Life Cycle

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Alaskan king crabs have two stages of development. In the first stage of development P. camtschaticus are free-swimming zoea. Zoea are very small and do not resemble the adult crab. During 3 to 4 months, the zoea molt 5 times. After the fifth molt the larval zoea begin to resemble the adult form, they are about 1/8 of an inch at this point, and adopt a benthic, or bottom dwelling, lifestyle.

Development - Life Cycle: metamorphosis

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Kluce, M. 2004. "Paralithodes camtschaticus" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Paralithodes_camtschaticus.html
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Michael Kluce, University of Michigan-Ann Arbor
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Phil Myers, Museum of Zoology, University of Michigan-Ann Arbor
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Benefits

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There are no known adverse affects of P. camtschaticus on humans.

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Kluce, M. 2004. "Paralithodes camtschaticus" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Paralithodes_camtschaticus.html
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Michael Kluce, University of Michigan-Ann Arbor
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Phil Myers, Museum of Zoology, University of Michigan-Ann Arbor
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Renee Sherman Mulcrone
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Benefits

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From 1960 to 1970 Alaskan king crabs generated hundreds of millions of dollars in economic revenue. However, within two years of over fishing in a given area catch returns diminish to a fraction of the original catch. Now the United States gets the majority of its crab meat from the North Atlantic Ocean north of Russia. There is now a rule for fishers that they can only catch males.

Positive Impacts: food

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Kluce, M. 2004. "Paralithodes camtschaticus" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Paralithodes_camtschaticus.html
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Michael Kluce, University of Michigan-Ann Arbor
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Phil Myers, Museum of Zoology, University of Michigan-Ann Arbor
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Renee Sherman Mulcrone
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Associations

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As adults, Alaskan king crabs are major predators. The mass numbers of zoea also serve as a food source for many organisms.

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Kluce, M. 2004. "Paralithodes camtschaticus" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Paralithodes_camtschaticus.html
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Michael Kluce, University of Michigan-Ann Arbor
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Phil Myers, Museum of Zoology, University of Michigan-Ann Arbor
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Trophic Strategy

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Larval P. camtschaticus are planktivores. The adult form feeds on many different animals including some fish parts and are generalized carnivore.

Animal Foods: fish; mollusks; aquatic or marine worms; aquatic crustaceans; echinoderms; zooplankton

Plant Foods: algae; macroalgae ; phytoplankton

Primary Diet: carnivore (Eats non-insect arthropods); planktivore

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Kluce, M. 2004. "Paralithodes camtschaticus" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Paralithodes_camtschaticus.html
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Michael Kluce, University of Michigan-Ann Arbor
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Phil Myers, Museum of Zoology, University of Michigan-Ann Arbor
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Distribution

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Paralithodes camtschaticus is distributed throughout the northern Pacific Ocean. They can be found as far south as the Sea of Japan, and north up to the Kamchatka Peninsula. On the west coast of North America the southern limit is the Queen Charlotte Islands, and the most northern point is Barrow, Alaska. Paralithodes camtschaticus is also found in the southeastern Bering Sea. While not native to the Atlantic Ocean, P. camtschaticus was commercially introduced in the Barents Sea, north of Russia.

Biogeographic Regions: nearctic ; palearctic ; arctic ocean ; atlantic ocean (Introduced ); pacific ocean

Other Geographic Terms: holarctic

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Kluce, M. 2004. "Paralithodes camtschaticus" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Paralithodes_camtschaticus.html
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Michael Kluce, University of Michigan-Ann Arbor
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Phil Myers, Museum of Zoology, University of Michigan-Ann Arbor
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Habitat

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Adults are found in the intertidal zone at depths of more than 200 m in the preferred sand and mud substrates. Annual migrations from the deep to shallow waters (50 m or shallower) occur in the late winter/early spring for mating.

Habitat Regions: temperate ; polar ; saltwater or marine

Aquatic Biomes: benthic ; coastal

Other Habitat Features: intertidal or littoral

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Kluce, M. 2004. "Paralithodes camtschaticus" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Paralithodes_camtschaticus.html
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Michael Kluce, University of Michigan-Ann Arbor
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Phil Myers, Museum of Zoology, University of Michigan-Ann Arbor
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Renee Sherman Mulcrone
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Life Expectancy

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The expected lifespan of P. camtschaticus is 15 to 20 years. The biggest non-commercial threat is molting. Molting can be stressful and cause death. In addition, the days after a molt are the most dangerous for P. camtschaticus, when the soft shell is vulnerable to predation. However, the main limit on life span for Alaskan king crabs is over-fishing.

Range lifespan
Status: wild:
20 to 30 years.

Typical lifespan
Status: wild:
15 to 20 years.

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Kluce, M. 2004. "Paralithodes camtschaticus" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Paralithodes_camtschaticus.html
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Michael Kluce, University of Michigan-Ann Arbor
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Phil Myers, Museum of Zoology, University of Michigan-Ann Arbor
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Renee Sherman Mulcrone
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Morphology

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Paralithodes camtschaticus have a dark red body and are characterized by having a fan shaped tail. King crabs have 5 sets of appendages, the first two are pincers, the right is usually larger then the left. The last appendages are used for mating. For males the last two appendages are used to spread spermatophore over the genital opening of a female, and for females the appendages are used to aid in the spreading of the spermatophore.

Range mass: 12.7 (high) kg.

Average mass: 10 kg.

Average length: 220 mm.

Other Physical Features: ectothermic ; heterothermic ; bilateral symmetry

Sexual Dimorphism: sexes alike

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Kluce, M. 2004. "Paralithodes camtschaticus" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Paralithodes_camtschaticus.html
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Michael Kluce, University of Michigan-Ann Arbor
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Phil Myers, Museum of Zoology, University of Michigan-Ann Arbor
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Associations

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During the first year Alaskan king crabs hide in crevices formed by rocks or kelp forests to avoid predation. From the ages of 1 to 4 Alaskan king crabs form clusters of up to 500,000 individuals called pods. The pods disperse only for feeding. This behavior is thought to be used for protection during molting, when a crab is most vulnerable. The adult Alaskan king crabs have few predators because of their heavily armored and bumpy carapace. Carcinonemertes (nemertean worms) feed on eggs while mother is incubating. Erimacrus isenbeckii (Korean hair crab), Enhydra lutris (sea otters), and Heimlepidotus or Myoxocephalus (sculpins) are possible predators for adults.

Known Predators:

  • nemertean worms (Carcinonemertes)
  • Korean hair crabs (Erimacrus isenbeckii)
  • sea otters (Enhydra lutris)
  • Irish lords (Hemilepidotus)
  • sculpins (Myoxocephalus)
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Kluce, M. 2004. "Paralithodes camtschaticus" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Paralithodes_camtschaticus.html
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Michael Kluce, University of Michigan-Ann Arbor
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Phil Myers, Museum of Zoology, University of Michigan-Ann Arbor
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Renee Sherman Mulcrone
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Reproduction

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Females attract males with a chemical that is released after eggs have hatched. The male then clasps onto the female and they remain connected until the female molts, and produces new eggs. Females mate once a year while males may mate multiple times each spring.

Mating System: polygynous

Female Alaskan king crabs mate immediately after the eggs hatch. During this process a male is attracted by a chemical that is released by the female. The male then clasps onto the female and holds her until she molts. The female and male may remain connected for up to 7 days. After molting the male uses his fifth pair of legs to spread spermatophores over the females opening. The females eggs are then released and pass over the spermatophores and become fertilized. These fertilized eggs are attached by the female to her pleopods under the abdomen and are incubated for approximately a year before hatching.

Breeding interval: Females breed once annually, while males can possibly mate with 11 females during the breeding season.

Breeding season: Alaskan King Crabs breed in the spring after migrating to water depths of 50 meters or less.

Range number of offspring: 150,000 to 400,000.

Range age at sexual or reproductive maturity (female): 5 to 6 years.

Range age at sexual or reproductive maturity (male): 5 to 6 years.

Key Reproductive Features: seasonal breeding ; gonochoric/gonochoristic/dioecious (sexes separate); sexual ; fertilization (External )

Female Alaskan king crabs incubate eggs for 1 year, providing protection. Within days of hatching, the female begins incubating next group of eggs.

Parental Investment: pre-fertilization (Provisioning); pre-hatching/birth (Protecting: Female)

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Kluce, M. 2004. "Paralithodes camtschaticus" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Paralithodes_camtschaticus.html
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Michael Kluce, University of Michigan-Ann Arbor
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Phil Myers, Museum of Zoology, University of Michigan-Ann Arbor
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Renee Sherman Mulcrone
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Red king crab

provided by wikipedia EN

The red king crab (Paralithodes camtschaticus), also called Kamchatka crab or Alaskan king crab, is a species of king crab native to the Bering Sea and Gulf of Alaska. It was introduced to the Barents Sea. It grows to a leg span of 1.8 m (5.9 ft), and is heavily targeted by fisheries.

Description

Paralithodes camtschaticus
P. camtschaticus can reach a leg span of 1.8 m (5.9 ft).

The red king crab is the largest species of king crab.[2] Red king crabs can reach a carapace width up to 28 cm (11 in), a leg span of 1.8 m (5.9 ft),[3] and a weight of 12.7 kg (28 lb).[4] Males grow larger than females. Today, red king crabs infrequently surpass 17 cm (7 in) in carapace width and the average male landed in the Bering Sea weighs 2.9 kg (6.4 lb).[2] It was named after the color it turns when it is cooked rather than the color of a living animal, which tends to be more burgundy.

Distribution

The red king crab is native to the Bering Sea, North Pacific Ocean, around the Kamchatka Peninsula and neighboring Alaskan waters. It was introduced artificially by the Soviet Union into the Murmansk Fjord, Barents Sea, during the 1960s to provide a new, and valuable, catch in Europe.[5] Red king crabs have been seen in water temperatures that range from −1.8 to 12.8 °C (28.8–55.0 °F), with typical being 3.2 to 5.5 °C (37.8–41.9 °F).[2] Immatures prefer temperatures below 6 °C (43 °F).[1] The depth at which it can live has much to do with what stage of its lifecycle it is in; newly hatched crab (zoea larvae) stay in the shallower waters where food and protection are plentiful.[1] Usually, after the age of two, the crabs move down to depths of 20–50 m (66–164 ft) and take part in what is known as podding; hundreds of crabs come together in tight, highly concentrated groups. Adult crabs are found usually more than 200 metres (656 ft) down on the sand and muddy areas in the substrate. They migrate in the winter or early spring to shallower depths for mating, but most of their lives are spent in the deep waters where they feed.[4]

Ecology

P. camtschaticus faces many predators in its native range including Pacific cod, walleye pollock, rock sole, flathead sole, rex sole, Dover sole (Microstomus pacificus), arrowtooth flounder, Elasmobranchs, halibut, sculpin, Greenland turbot, Pacific salmon, Pacific herring, otters (Enhydra lutris) and seals.[6]

Fisheries

The red king crab is the most coveted of the commercially sold king crab species, and it is the most expensive per unit weight. It is most commonly caught in the Bering Sea and Norton Sound, Alaska, and is particularly difficult to catch, but is nonetheless one of the most preferred crabs for consumption.[7]

Red king crabs are experiencing a steady decline in numbers in their native far east coastal waters for unclear reasons, though several theories for the precipitous drop in the crab population have been proposed, including overfishing, warmer waters, and increased fish predation.[8] Fishing controls set by the United States in the 1980s and 2000s have failed to stem the decline.[9]

In Europe

In the 1960s, the Soviet Union transported red king crabs from the North Pacific Ocean to the Murmansk Fjord. They did not survive transport overland, so a batch was flown in, which survived, was released, and bred and spread in the wild.

It was first found in Norway in 1977. In the Barents Sea, it is an invasive species[10] and its population is increasing tremendously. This is causing great concern to local environmentalists and local fishermen, as the crab eats everything it comes across and is spreading very rapidly, eating most seabed life and "creating a desert". Since its introduction in the 1960s, it has spread west along the Norwegian coast and also has reached Svalbard.[11][12] The species keeps on advancing southwards along the coast of Norway and some scientists think they are advancing around 50 km (31 mi) a year.[13] In Norway they are sometimes called "Stalin's crabs", since they were introduced by the Soviet Union.[14]

By the mid 1990s, the king crabs reached North Cape. The Norwegian Institute of Marine Research found in 2010–2013 that they have reached Sørøya and are breeding there. A few have been caught as far south as Tromsø. There is fear of the result if they reach the cod breeding grounds off Lofoten.

A report on 8 June 2009 said that a red king crab had been caught off Skogsvåg at Sotra south of Bergen in south Norway. An important natural predator of the red king crab, the giant Pacific octopus (Enteroctopus dofleini, formerly called Octopus apollyon), does not occur in European waters. A fisherman in Honningsvåg (a town near the North Cape) complained that king crabs' claws were ruining fishing nets and deep lines.[15] Despite these concerns, the species is protected by diplomatic accords between Norway and Russia as part of a fisheries agreement between Norway and Russia about the Barents Sea, and a bilateral fishing commission decides how to manage the stocks and imposes fishing quotas. West of the North Cape on Norway's northern tip, Norway manages its crab population itself.[15] As of May 2006, only 259 Norwegian fishermen were allowed to catch it east of the North Cape.[15]

In the Norwegian Sea, some evidence indicates that the red king crabs eat the egg masses of the capelin, which is an important prey for the cod.[16] The report (as at 24 May 2006) said that in Norwegian Sea, in the Barents Sea (east of the North Cape), catching red king crab is allowed with license only due to a fisheries agreement between Norway and Russia, but elsewhere in Norwegian seas, the catching of king crab is much freer, but nonetheless, if someone catches one, it is illegal to throw it back in the sea.[16]

In January 2022 fishermen in the United Kingdom started catching King crabs.[17]

Waste recycling

On average, crab processing waste can account for 69% of the catch mass. The mass fraction of carapace from these wastes is approximately 60%; the rest comprises the entrails (including the digestive organ, the hepatopancreas). In red king crab, the hepatopancreas makes up about 90% of the intestines of the carapace and 5–10% of the total weight of the animal. The hepatopancreas of the digestive system of commercial crabs is a valuable source of a complex of enzymes with various activities: collagenase, protease, hyaluronidase, lipase, nuclease, etc. The complex of proteolytic enzymes of the red king crab hepatopancreas is of interest in various industries.[18]

Physiology

Mature female red king crabs must stay in warmer water (near 4 °C) to ensure the eggs will be ready for hatching, while the male red king crabs stay in relatively cold water (near 1.5 °C) to conserve energy. In spring (May), female red king crabs move to shallow coastal areas to molt and spawn, and males join the females in the shallow water before molting. In the summer (mid-June through mid-November), these crabs spend their time in fairly deep water, below the established summer thermocline. When the thermocline breaks down, the red king crabs migrate back to intermediate depths, where they stay until the female red king crabs release the eggs fertilized in the previous spawning.[19]

The red king crab has a wide range of tolerance to temperature, but it affects their growth. The organism's growth and molting is slow when outside temperature falls below 8 °C; around 12 °C, they molt rather quickly.[20]

Overall, red king crabs have a high adaptation capacity in changes of salinity level because the crabs retain their vital functions and their feeding activities.[21] A difference is seen, though, in the salinity tolerance between juvenile and adult red king crabs. Juveniles are slightly more tolerant to low salinity because their volume regulation is significantly better. Juveniles are consistently hyposmotic to the seawater because they have lower sodium concentration in their hemolymph. As the juveniles are smaller, their exoskeleton is more rigid. The adult red king crabs are hyperosmotic in high salinity and becomes hyposmotic in lower salinity. The hyperosmoticity is due to the higher sodium and potassium concentrations in the hemolymph compared to the surrounding water they live in.[22]

A slight fluctuation on the pH level of the water (i.e. making the water more acidic) would have great effect on the red king crab. They grow slower in acidified water (pH 7.8 instead of 8.0) and eventually die after longer exposure times because of the imbalance of the organisms' acid-base equilibrium.[23]

Respiration

The red king crab has five sets of gills used for respiration, which are in the bronchial chamber within the carapace. The carapace is a covering of sheets of exoskeleton that overhang the thorax vertically to fit over the base of the thoracic legs. The carapace encloses two branchial chambers that enclose the gills. The gill surfaces are covered in chitinous cuticle, which is permeable to gases, allowing gas exchange. Internal gills, like other specialized gills, need metabolic energy to pull water over the respiratory surface.[24]: 622  To induce a current into the branchial chamber the crab uses back and forth movements of an appendage called the scaphognathite.[25] The water is drawn in from behind the walking legs then expelled from the branchial chambers through the tubes called prebronchial apertures, which are located beside the mouth.[26] To filter the water before entering the branchial chamber, crabs have branchiostegal hairs that can collect debris.[27] Due to the environment to which it is exposed, the posterior gills of the crab can also be cleared of parasites and sediment by increasing the movement of its fifth set of primitive legs.[28]

Each gill has a main axis with many lateral filaments or lamellae that are vascularized. The afferent channel transports blood from the gill axis into each filament through a fine afferent canal to the gill top. Blood returns by a minute efferent canal to the gill tip to the efferent channel and passes to the pericardial chamber, which contains the heart. Gases are exchanged in the numerous filaments, and oxygen absorption is especially facilitated by hemocyanin. Red king crabs exhibit unidirectional ventilation. This can be described as the flow of water in a U-shaped course; water passes posteriorly from the incurrent opening, an opening in the carapace near the base of the chelipeds, dorsally over the gills, and anteriorly to exit beside the head.

Circulation

Due to their respiratory system's limited ability to deliver by diffusion, respiratory gases must be transported around the body.[25]: 303–306 Paralithodes camtschaticus has an open circulatory system with a dorsal, ostiate heart.[29] An open circulatory system has circulating fluid that passes somewhat freely among the tissues before being collected and recirculated. The heart is in a pericardial chamber, and blood passes through this chamber into the lumen of the heart through two pairs of ostia.[25] Seven arteries conduct blood from the heart to various regions of the body. Each artery branches extensively, and smaller arteries ultimately end in the hemocoel. Venous blood drains into the sternal sinus, where it is conveyed by channels to the gills for aeration and returned again to the pericardial sinus.

They have a neurogenic heart, which has rhythmic depolarization that is responsible for initiating heartbeats.[24]: 653  Heartbeats originate in nervous tissue; innervated muscle cells cause the heart to contract when stimulated by nerve impulses. The cardiac ganglion, which consists of nine neurons, attaches to the dorsal wall of the heart. The anterior neurons innervate the heart, whereas the other posterior neurons make synaptic contact with those anterior neurons. The posterior neuron acts as the pacemaker but also functions as the cellular oscillator and the central pattern generator. This posterior neuron produces a train of impulses, which excites the other posterior neurons. The heart contracts when the posterior neurons activate the five anterior neurons, which send impulses to the muscle cells. This is how the Frank–Starling mechanism works within crustaceans. The Frank-Starling mechanism refers to the vitally important intrinsic control of the heart; mainly, the stretching of the cardiac muscle tends to increase the force of its contraction by an effect at the cellular level.[24]: 654  This mechanism is important as it allows the organism to match its output of blood with its input of blood. Because of the stretching between beats, the Frank-Starling mechanism allows the heart to then naturally contract more forcefully, allowing greater flow of blood, which results in the matched heart output to the increased blood received.[24]: 654  The Frank-Starling mechanism is a little different in crustaceans, as it involves the cardiac ganglion as described previously. The stretching of the heart induces the ganglion to fire more regularly and powerfully.

Red king crab blood contains leukocytes and the second-most common respiratory pigment called hemocyanin.[25]: 488  Arthropod hemocyanin is a distinct variation specific to arthropods and is a metalloprotein that uses copper atoms that are bound to its structure. Two copper atoms are needed to bind one O2 molecule. Because it is a large protein molecule, it is found in the blood plasma, but not in body tissues or muscles. Hemocyanins are named appropriately because when oxygenated, their color changes from colorless to blue.[24]: 622 

See also

References

  1. ^ a b c Jørgensen, Lis Lindal. "Invasive Alien Species Fact Sheet – Paralithodes camtschaticus" (PDF). NOBANIS.org. Archived from the original (PDF) on 23 October 2013.
  2. ^ a b c Stevens, B. G., ed. (2014). King Crabs of the World: Biology and Fisheries Management. CRC Press. pp. 3–7. ISBN 978-1-4398-5542-3.
  3. ^ Jensen, Gregory (2004). "Order:Decapoda". In Hutchins, Michael (ed.). Grzimek's Animal Life Encyclopedia. Vol. 2. Detroit: Thomson-Gale. p. 208. ISBN 978-0-7876-5362-0.
  4. ^ a b Kluce, Michael. "Paralithodes camtschaticus". Animal Diversity Web. Retrieved October 16, 2013.
  5. ^ "Archived copy" (PDF). Archived from the original (PDF) on 2016-08-10. Retrieved 2016-06-16.{{cite web}}: CS1 maint: archived copy as title (link)
  6. ^ Falk-Petersen, Jannike; Renaud, Paul; Anisimova, Natalia (2011-01-12). "Establishment and ecosystem effects of the alien invasive red king crab (Paralithodes camtschaticus) in the Barents Sea–a review". ICES Journal of Marine Science. International Council for the Exploration of the Sea (OUP). 68 (3): 479–488. doi:10.1093/icesjms/fsq192. ISSN 1095-9289.
  7. ^ "A meal to get your claws into". SeafoodfromNorway.com. 6 February 2006. Archived from the original on 8 February 2012. Retrieved 20 February 2010.
  8. ^ S. Forrest Blau (1997). "Alaska King Crabs: Wildlife Notebook Series". Alaska Department of Fish and Game.
  9. ^ Blau, S. Forrest (November 1997). "Alaska King Crabs". Alaska Department of Fish and Game. Retrieved 20 February 2010.
  10. ^ "King Crab Invasion | Scuba Diving Blog".
  11. ^ Bevanger, Lars (9 August 2006). "Norway fears giant crab invasion". BBC News. Retrieved 20 February 2010.
  12. ^ Kirby, Alex (29 September 2003). "King crabs march towards the Pole". BBC News. Retrieved 20 February 2010.
  13. ^ Kirby, Alex (29 September 2003). "King crabs march towards the Pole". BBC News. BBC. Retrieved 20 October 2020.
  14. ^ "Stalin's crabs march into foreign waters". NBC News. Retrieved 2022-10-15.
  15. ^ a b c Deshayes, Pierre-Henry (24 May 2006). "Barents Sea teems with 'Stalin's crabs'". Mail & Guardian. Retrieved 20 February 2010.
  16. ^ a b "Stalin's crabs the new gourmet treat". Independent.co.uk. 8 July 2006.
  17. ^ "King crabs invade UK waters threatening native species". TheGuardian.com. 28 January 2022.
  18. ^ Ponomareva, Tatyana; Timchenko, Maria; Filippov, Michael; Lapaev, Sergey; Sogorin, Evgeny (March 2021). "Prospects of Red King Crab Hepatopancreas Processing: Fundamental and Applied Biochemistry". Recycling. 6 (1): 3. doi:10.3390/recycling6010003. ISSN 2313-4321.
  19. ^ Loher, Timothy; Hill, P. Scott; Harrington, Gretchen; Cassano, Edward (1998). "Management of Bristol Bay Red King Crab: A Critical Intersections Approach to Fisheries Management". Reviews in Fisheries Science. 6 (3): 169–251. doi:10.1080/10641269891314285. hdl:1773/4220.
  20. ^ Stoner, Allan W.; Ottmar, Michele L.; Copeman, Louise A. (2010). "Temperature effects on the molting, growth, and lipid composition of newly-settled red king crab". Journal of Experimental Marine Biology and Ecology. 393 (1–2): 138–147. doi:10.1016/j.jembe.2010.07.011.
  21. ^ Ilyushchenko, A. M.; Zenzerov, V. S. (2012). "New data on the tolerance of Barents Sea red king crabs to low salinity". Russian Journal of Ecology. 43 (2): 177–178. doi:10.1134/S1067413612020075. S2CID 42370491.
  22. ^ Thomas, Robert E; Rice, Stanley D (1992). "Salinity tolerance of adult and juvenile red king crabs Paralithodes camtschatica". Comparative Biochemistry and Physiology A. 103 (3): 433–437. doi:10.1016/0300-9629(92)90268-U.
  23. ^ Dupont, Sam; Long, William Christopher; Swiney, Katherine M.; Harris, Caitlin; Page, Heather N.; Foy, Robert J. (2013). "Effects of ocean acidification on juvenile red king crab (Paralithodes camtschaticus) and tanner crab (Chionoecetes bairdi) growth, condition, calcification, and survival". PLOS ONE. 8 (4): e60959. Bibcode:2013PLoSO...860959L. doi:10.1371/journal.pone.0060959. PMC 3617201. PMID 23593357.
  24. ^ a b c d e Hill, Richard (2012). Animal Physiology, Third Edition. Sunderland, Massachusetts: Sinauer Associates, Inc. ISBN 978-0-87893-559-8.
  25. ^ a b c d Lutz, Paul (1985). Invertebrate Zoology. USA: The Benjamin/Comings Publishing. p. 489. ISBN 978-0-201-16830-3.
  26. ^ Carefoot, Tom. "Learn About Crabs & Relatives". A Snail's Odyssey. Retrieved October 14, 2013.
  27. ^ Wilkins, Jerrel (1981). Locomotion and Energetics in Arthropods. New York: Springer US. p. 278. ISBN 978-1-4684-4066-9.
  28. ^ Dvoretsky, Alexander G.; Dvoretsky, Vladimir G. (2009). "Distribution of amphipods Ischyrocerus on the red king crab, Paralithodes camtschaticus: Possible interactions with the host in the Barents Sea". Estuarine, Coastal and Shelf Science. 82 (3): 390–396. Bibcode:2009ECSS...82..390D. doi:10.1016/j.ecss.2009.01.025.
  29. ^ Britayey, T. A.; Rzhaysky, A. V.; Pavlova, L. V.; Dyoretskij, A. G. (2010). "Studies on impact of the alien red king crab (Paralithodes camtschaticus) on shallow water benthic communities of the Barents Sea". Journal of Applied Ichthyology. 26: 66–73. doi:10.1111/j.1439-0426.2010.01494.x.
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Red king crab: Brief Summary

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The red king crab (Paralithodes camtschaticus), also called Kamchatka crab or Alaskan king crab, is a species of king crab native to the Bering Sea and Gulf of Alaska. It was introduced to the Barents Sea. It grows to a leg span of 1.8 m (5.9 ft), and is heavily targeted by fisheries.

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