Edible crab (Cancer pagurus)

NBN Interactive08-05-2008

Map accurate at time of writing. Visit NBN or OBIS to view current distribution

Researched byKen Neal & Emily Wilson Refereed byThis information is not refereed.
AuthorityLinnaeus, 1758
Other common names- Synonyms-

Summary

Description

Crab with a heavy, oval shaped body, easily distinguished from other species by its 'piecrust' edge and massive black tipped pincers. It is reddish-brown in colour with very large individuals having a carapace width of up to 25 cm although individuals are typically up to 15 cm.

Recorded distribution in Britain and Ireland

All British and Irish coasts.

Global distribution

From Norway throughout the North Sea and English Channel to the coast of Portugal. Cancer pagurus may penetrate into the Mediterranean Sea and occur in the Black Sea (Anosov, 2000) but this is yet to be confirmed.

Habitat

Found on bedrock including under boulders, mixed coarse grounds, and offshore in muddy sand. Lower shore, shallow sublittoral and offshore to about 100 m.

Depth range

From intertidal down to 100m

Identifying features

  • Claw pincers black, slightly unequal in shape and toothed.
  • Wide, oblong-shaped carapace is distinctively marked along its fronto-lateral margins with 10 rounded lobes.
  • Tufts of stiff hairs in rows on legs (pereopods).
  • Last leg segment (dactyls) of walking legs ending in spine-like tips.

Additional information

Also known as the brown crab.

Listed by

- none -

Further information sources

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Biology review

Taxonomy

PhylumA bivalve mollusc
ClassMalacostracaCrabs, lobsters, sand hoppers and sea slaters
OrderA bivalve mollusc
FamilyCancridae
GenusCancer
AuthorityLinnaeus, 1758
Recent Synonyms

Biology

Typical abundanceHigh density
Male size range5-27cmMale size at maturity11cm
Female size range11.5cmFemale size at maturity
Growth formArticulateGrowth rate0.1-1cm/year
Body flexibilityNone (less than 10 degrees)Mobility
Characteristic feeding methodPredator
Diet/food sourcePlanktotrophic
Typically feeds onA variety of live molluscs and crustaceans as well as carrion
Sociability Environmental positionEpibenthic
DependencyNo information found.
SupportsNo information
Is the species harmful?No

Biology information

Feeding
Cancer pagurus is a large crab typical of hard and soft bottom communities. It is an active predator and consumes a variety of crustaceans (e.g. the green shore crab Carcinus maenas, the broad clawed porcelain crab Porcellana platycheles, the long clawed porcelain crab Pisidia longicornis, the hairy crab Pilumnus hirtellus and the squat lobster Galathea squamifera) and will also eat smaller members of their own species (conspecifics) (Lawton, 1989). Cancer pagurus also consumes a variety of molluscs e.g. the dog whelk Nucella lapillus, the winkle Littorina littorea (Lawton & Hughes, 1985), razor shells Ensis spp. (Hall et al., 1991), the blue mussel Mytilus edulis, the common cockle Cerastoderma edule and the oyster Ostrea edulis (Mascaro & Seed, 2001). Motile prey may be stalked and pounced upon, trapped under the abdomen and crushed with the chelae. Some prey is also ambushed from shelters under rocks (Lawton, 1989). In sediments Cancer pagurus may dig large pits to access bivalve molluscs such as Ensis sp. (Hall et al., 1991) and Lutraria lutraria. Cancer pagurus is mainly nocturnal, presumably to reduce predation by wolf fish, seals and cod (Skajaa et al., 1998).

 

Growth
Juveniles settle in the intertidal zone in late summer/ early autumn (Bennett, 1995) and remain there until they reach a carapace width (CW) of 6-7 cm (which takes about 3 years) before they move to subtidal areas (Regnault, 1994). Growth rate varies with age and gender. Between years 4-8 of a male crabs life, it grows at about 1 cm CW per year. After the 8th year, growth rate slows gradually to about 2 mm per year between its 16th and 20th years. Female growth rate is less, at about 0.5 cm per year between years 4 and 8, declining to 0.1 cm per year between years 16 and 20 (Bennett, 1979).

Size can be related to depth. In less than 25 m of water, males and females have a mean CW of 14 cm. Between 25 and 55 m, males are on average 17 cm CW and females 15.8 cm, over 55 m these sizes increase to 18 cm CW for males and 17 cm CW for females (Brown & Bennett, 1980).

Habitat preferences

Physiographic preferencesOffshore seabed, Strait / sound
Biological zone preferencesLower circalittoral, Lower eulittoral, Lower infralittoral, Mid eulittoral, Sublittoral fringe, Upper circalittoral, Upper infralittoral
Substratum / habitat preferencesBedrock, Coarse clean sand, Cobbles, Fine clean sand, Gravel / shingle, Muddy gravel, Muddy sand, Pebbles, Sandy mud
Tidal strength preferencesModerately Strong 1 to 3 knots (0.5-1.5 m/sec.), Weak < 1 knot (<0.5 m/sec.)
Wave exposure preferencesExposed, Moderately exposed
Salinity preferencesFull (30-40 psu), Variable (18-40 psu)
Depth rangeFrom intertidal down to 100m
Other preferencesNone
Migration PatternNon-migratory / resident

Habital Information

Adult Cancer pagurus cannot tolerate salinities of 17 psu or lower whereas young (5-10 cm CW) can tolerate reduced salinities for extended periods (Wanson et al., 1983).

Life history

Adult characteristics

Reproductive type Gonochoristic (dioecious) Reproductive frequency Annual episodic
Fecundity (number of eggs) >1,000,000 Generation time 10-20 years
Age at maturity 10 years + Season November - February
Life span 20-100 years

Larval characteristics

Larval/propagule type - Larval/juvenile development Planktotrophic
Duration of larval stage 1-6 months Larval dispersal potential Greater than 10 km
Larval settlement period Insufficient information

Life history information

Mating is by copulation in spring and summer and occurs shortly after the female has moulted (Brown & Bennett, 1980). Females are 'berried' (carrying eggs under the abdomen) for 6-9 months after copulation and release the larvae in late spring/early summer (Thompson et al., 1995). Berried females do not feed, remaining in pits dug in the sediment or under rocks and are unlikely to be caught in a baited pot. As a result, fishing pressure does not affect larval supply (Howard, 1982). Fecundity is between 0.25 and 3 million eggs per female depending on size (Bennett, 1995). Females can store sperm and berried females retained after an experiment went on to produce viable larvae in the following reproductive season without moulting or copulating (Naylor et al., 1999). In the North Sea, berried females migrate offshore to release larvae and then move back inshore to feed (see larval general biology; Nichols et al., 1982).

Sensitivity reviewHow is sensitivity assessed?

Physical pressures

 IntoleranceRecoverabilitySensitivityEvidence/Confidence
Intermediate Moderate Moderate Very low
Substrate removal is likely to remove a proportion of Cancer pagurus although some will escape. Those that escape undamaged will quickly recolonize whatever seabed remains and migrate to new habitats if necessary. Therefore an intolerance of intermediate and a recoverability of moderate have been recorded.
Low Very high Very Low High
Shoreline dumping of coal waste and fly ash in the western North Sea filled in rocky crevices, precluding their use by Cancer pagurus. Crab fisheries have declined in the areas of dumping possibly due to Cancer pagurus avoiding the suspended matter or because the paucity of benthic fauna (i.e. prey) caused by heavy siltation. China clay waste from the Rivers Fal, White and Par in Cornwall had a similar effect (Shelton, 1973). However, crabs are able to escape from under silt and migrate away from an area. Smothering is unlikely to cause mortality therefore an intolerance of low has been recorded.
Low High Low Very low
Shelton (1973) reported that Cancer pagurus avoided areas of spoil dumping and suggested this may be due suspended sediment or due to decreased macrofauna. Cancer pagurus relies on visual acuity to find prey so although mortality due to an increase in suspended sediment is unlikely, some perturbation is expected and low has been recorded.
Tolerant Not relevant Not sensitive
Cancer pagurus is not reliant on suspended sediment, therefore is unlikely to be affected by a decrease in suspended sediment and tolerant has been recorded.
Tolerant Not relevant Not sensitive Low
Adult Cancer pagurus are very unlikely to be subject to desiccation because they are subtidal but are likely to survive at the benchmark level as they can survive up to 24 hours in moist air (Regnault, 1992). The juveniles in the intertidal seek shelter in moist microhabitats under rocks and seaweed (Lawton, 1989) and are likely to survive extended exposure in the short term and will migrate downshore upon emersion on the next high tide. Cancer pagurus survive for long periods in fish boxes waiting to be sold, therefore tolerant has been recorded.
Tolerant Not relevant Not sensitive High
In an experiment on blood chemistry of emersed crabs, 60 Cancer pagurus survived exposure to air but under wet seaweed for 24 hours (Regnault, 1992). However, increased emergence will probably cause them to migrate down shore during a following period of immersion. An increase in emergence is unlikely to cause mortality or perturbation to Cancer pagurus and tolerant has been recorded.
Tolerant* Not relevant Not sensitive* Low
Adult Cancer pagurus are subtidal and are unlikely to be affected by a decrease in emergence. Juveniles less than 3 years of age are mainly intertidal (Regnault, 1994) and a decrease in emergence is likely to be beneficial as it would increase foraging time. Therefore tolerant* has been recorded.
Tolerant Not relevant Not sensitive Moderate
Cancer pagurus is highly chemosensitive and can quickly navigate to bait in a current of 0.1m/s. However, when the current speed rises to 0.3 m/s, only 15% of crabs on sediment could make headway, the others were swept away (Nickell & Moore, 1992). Therefore, crabs in strong current are unlikely to be killed but would probably be able to feed only by digging pits for buried bivalves (Hall et al. 1991) or ambush from the shelter of topographic features (Lawton, 1989), which may affect their rate of growth and maturity. Nevertheless, high current velocity bedrock habitats are likely to have a plentiful supply of food and provide refuge from the current due to habitat complexity and Cancer pagurus may benefit. The greater densities of edible crabs seen by Keith Hiscock (pers. comm.) were seen at the Smalls Rocks, Pembrokeshire and at Strangford Lough Narrows, both areas of very strong currents. Therefore tolerant has been recorded.
Tolerant Not relevant Not sensitive Low
A decrease in water movement probably would not affect Cancer pagurus as it does not rely on water movement for feeding or gas exchange and tolerant has been recorded.
Intermediate Very high Low Low
Any effect from an increase in temperature would depend on the time of year. Adult Cancer pagurus are not tolerant of temperatures over 20°C (Karlsson & Christiansen, 1996) and if an acute change of temperature occurred in summer when sea temperatures are already high, some mortality could occur. However, if an acute rise in temperature occurred in winter the only effect would be an increase in activity associated with a rise in metabolic rate. A chronic increase in temperature is unlikely to affect Cancer pagurus. An intolerance of intermediate has been recorded to account for the worst case scenario.
Tolerant Not relevant Not sensitive Low
Cancer pagurus will not feed between 0 and 5°C (Karlsson & Christiansen, 1996) and embryos will not develop below 8°C (Thompson et al., 1995). Therefore if an acute decrease in temperature took the absolute temperature below 5°C, productivity of Cancer pagurus might be affected although mortality is unlikely. A chronic decrease in temperature is unlikely to affect Cancer pagurus at the benchmark level and tolerant has been recorded.
Tolerant* Not relevant Not sensitive* Very low
The prey of Cancer pagurus includes various filter feeding bivalves (Hall et al., 1991; Mascaro & Seed, 2001) and filter feeding crabs (Lawton, 1989). The productivity of these prey items is likely to be increased by increased turbidity and thus improve the ratio of effort/predation success by Cancer pagurus and thus improve their productivity as well. An increase in suspended matter may reduce predation from visual predators such as seals and fish but is unlikely to affect the foraging of the crab as this is mainly chemosensory and tolerant* has been recorded.
Tolerant Not relevant Not sensitive
Adult Cancer pagurus are not dependent in any way on water-borne particles and are unlikely to be affected by a decrease in turbidity.
Low Very high Very Low Low
No information was found on effect of wave exposure. However, edible crabs are found from very exposed to extremely wave sheltered sites. Wave exposure is likely to reduce activity at times and prevent crabs escaping to shallow depths. Therefore an intolerance of low has been recorded.
Tolerant Not relevant Not sensitive Low
Cancer pagurus occurs in extremely wave sheltered loughs. Decreased wave exposure likelihood of displacement (a favourable effect) and increase food supply but may increase siltation. Overall, Cancer pagurus is probably tolerant to a decrease in wave exposure.
No information Not relevant No information
No information found
Low Very high Very Low Low
Cancer pagurus is nocturnal and has reasonably good eyesight, any lights that are present in the water are likely to affect their activity patterns. Since they are predated upon by seals (Skajaa et al., 1998), large objects in the water such as divers may cause active crabs to seek refuge and inactive ones to remain so. An intolerance of low has been recorded because visual presence is unlikely to cause mortality but will probably alter its behaviour.
Intermediate High Low High
Berried Cancer pagurus are likely to be disturbed by dredging and trawls as they are relatively immotile and spend most of their time half buried in the sediment (Bennett, 1995). Abrasion is also likely to make Cancer pagurus vulnerable to Burn Spot Disease which may cause some mortality (Austin & Alderman, 1987; Vogan et al., 1999). Cancer pagurus is found in large numbers in scallop (Pecten maximus) beds (pers. obs.) which are commercially exploited by dredging. Cancer pagurus is often damaged or killed if struck by a dredge and annual mortality can be as much as 14% of the population (Bradshaw et al., 1999). Jenkins et al. (2001) found that 63% of Cancer pagurus struck by a scallop dredge sustained damage and 68% of those (43% of the total number struck) were killed. Mortality from otter trawls caused a 50% decline in Cancer pagurus numbers between 1947 and 1960 (Lindeboom, 1999). Cancer pagurus is a rather brittle animal, easily damaged or killed by heavy impacts, and an intolerance of intermediate has been recorded because, although a high proportion of individuals die as a result of scallop dredging, the whole population is unlikely to be affected.
Tolerant Not relevant Not sensitive Moderate
Cancer pagurusis tolerant of being hauled into boats in crab pots and returned to the sea, with an increase in metabolic rate the only effect (Aldrich & Regnault, 1990). It also survives well when caught in pots and taken to laboratories and so is tolerant of being displaced within the marine environment (Regnault, 1992; Overnell, 1984).

Chemical pressures

 IntoleranceRecoverabilitySensitivityEvidence/Confidence
High High Moderate High
Toxicity experiments with the oil dispersant BP1002 showed that a concentration of 10 ppm was required to cause 100% in 24 hours (Smith, 1968).
Heavy metal contamination
Low High Low High
Cancer pagurus naturally accumulates metal, and levels of metals in the hepatopancreas have been recorded as high as 200 ppm copper, 29 ppm cadmium and 20 ppm zinc in crabs that were considered uncontaminated by anthropogenic input (Overnell, 1982, 1984). A solution of 1 ppm HgCl2 is lethal to Cancer pagurus (Bianchini & Gilles, 1996) but Cancer pagurus generally seems to be tolerant of metal pollution. Copper and zinc affected arterial blood oxygen levels and caused an increase in heart rate when accompanied by mild hypoxia (Spicer & Weber, 1992). Solutions containing cadmium significantly inhibited gill adenosine phospatase (ATPase) activity at 10 and 100 ppm in short pulses (Law, 1982). Protracted exposure to low concentrations of cadmium lead to a 22% drop in gill ATPase activity which will affect the crabs ability to control the ionic balance of the body tissues (as this is one of the main requirements of adenosine triphosphate (ATP) in the gill) (Law, 1982). Apart from mercury, most metals seem to be non-toxic to Cancer pagurus as they are sequestered by metallothioneins and stored in the hepatopancreas for excretion later (Knowles et al., 1998; Overnell, 1982; 1984; 1986; Smith et al., 1998). Due to the detoxification of metals with metallothioneins, Cancer pagurus is unlikely to suffer mortality unless inputs are very high and an intolerance of low has been recorded.
Hydrocarbon contamination
Intermediate High Low High
Adult Cancer pagurus are unlikely to be directly oiled because they are subtidal. Many intertidal juveniles were found dead after the Torrey Canyon oil spill and some dead adults were found subtidally, although healthy individuals were found as well (Smith, 1968). The adults affected subtidally may have been killed by dispersants and not oil. After the Sea Empress oil spill, Cancer pagurus were found to have total hydrocarbon content of 10 mg/kg wet weight in claw meat and 20 mg/kg wet weight in the hepatopancreas (Law et al., 1997). Paradoxically, this increased the Cancer pagurus population in the region of the Sea Empress spill since the 0.1 - 2.4 mg/kg wet weight concentrations of polycyclic aromatic hydrocarbons (PAHs) tainted the flesh of the crab and led to the closure of the fishery for at least a year eliminating fishing mortality (SEEEC, 1998; Law et al., 1998). Cancer pagurus in the vicinity of the Braer oil spill contained more than 12 times the PAH concentration of unaffected crabs (Topping et al., 1997). As with the Sea Empress, no mortality resulted from PAH contamination but the crab fishery was closed for a short time to allow PAH elimination (Topping et al., 1997). An intolerance of intermediate has been recorded to account for the worst case of juveniles being killed by oiling and possibly affecting the future of the population.
Radionuclide contamination
No information Not relevant No information High
Cancer pagurus accumulates technetium, a radionuclide of anthropogenic origin, in the hepatopancreas bound by metallothionein (Knowles et al., 1998). Accumulated metal can be excreted once exposure has ceased and experimental Cancer pagurus cleared half of the accumulated technetium in about 100 days (Smith et al., 1998). Due to the detoxification of metal by binding it to metallothioneins, Cancer pagurus may be tolerant but the effect of radiation during decay of radionuclides is unknown. Therefore no assessment of intolerance has been made.
Changes in nutrient levels
Tolerant Not relevant Not sensitive Very low
Anthropogenic sources of nutrients may cause blooms of phytoplankton which collapse and precipitate onto the benthos and can cause localised bottom water hypoxia. In a benthic survey after such a bloom collapse, a few dead Cancer pagurus were found but most were healthy, probably because it is tolerant of hypoxia (see oxygenation). However, benthic bivalves such as Ensis were found dead and moribund (Boalch, 1978). Immediately after the precipitation of the bloom, foraging by Cancer pagurus was probably improved as it preys upon Ensis (Hall et al., 1991). However, if the bivalve populations were slow to recover, population dynamics on Cancer pagurus may be affected. On the rocky shore, nutrient input has been shown to increase productivity of grazers due to increased algal growth (Rogers, 2003). Since juvenile Cancer pagurus consume intertidal gastropods (Lawton & Hughes, 1985), an increase in prey biomass is likely to benefit growth of Cancer pagurus. Tolerant has been recorded because Cancer pagurus is unlikely to be directly affected by nutrient input and there could be positive and negative effects on the prey of Cancer pagurus.
No information Very high No information Low
Cancer pagurus is an osmoconformer (Wanson et al., 1983) and is probably tolerant to slight increases in salinity but may be affected by acute increases. However, no information has been found on the effect of hypersaline conditions on Cancer pagurus and therefore no assessment has been made.
Low High Low High
Adult Cancer pagurus are osmoconformers, meaning that they maintain the ionic balance of the haemolymph at a similar concentration to the surrounding water but they are intolerant of salinities below 17 psu. Juveniles (5-10 cm CW) are mainly intertidal and are tolerant of low salinities (Wanson et al., 1983). Cancer pagurus loses osmoregulatory ability when it moves from the intertidal to the subtidal at about 3 years of age (Regnault, 1992). Intertidal populations of Cancer pagurus are probably tolerant of decreases in salinity. However, subtidal adults are likely to be adversely affected by low salinities e.g. from hyposaline effluents. Cancer pagurus is a very mobile species and would probably avoid hyposaline water and therefore an intolerance of low has been recorded.
Tolerant Very high Not sensitive High
Cancer pagurus responds to hypoxia by increasing the efficiency of oxygen extraction from the water by its gills (Aldrich & Regnault, 1992; Spicer & Weber, 1992). Cancer pagurus can survive for at least 18 hours in oxygen-depleted conditions (Spicer & Weber, 1992) and can probably survive longer.

Biological pressures

 IntoleranceRecoverabilitySensitivityEvidence/Confidence
Intermediate Moderate Moderate High
Cancer pagurus can contract Burn Spot Disease and Pink Crab Disease. The former is caused by bacterial (especially species of Vibrio) or fungal infections of epicuticular penetrations caused by abrasions or intraspecific aggression (Austin & Alderman, 1987; Vogan et al., 1999). Burn Spot Disease causes blackened lesions of the shell and melanisation of the flesh, which decreases the market value of the crab (Vogan et al., 1999). Mortality occurs in extreme infections when bacteria penetrate the shell and enter the body fluids or when lesions cause the old shell to stick to the crab during moulting (Austin & Alderman, 1987; Vogan et al., 1999). Prevalence of the disease can be high, e.g. 55% of crabs in Langland Bay, Gower had lesions and infection levels can be higher in heavily polluted waters. Cancer pagurus can rid itself of shell disease by moulting (Vogan et al., 1999). Pink Crab Disease is so named because affected crabs become hyperpigmented and it is caused by an infection of a Hematodinium-like dinoflagellate. It is a rare disease but infected individuals become moribund and mortality is high (Stentiford et al., 2002). An intolerance of intermediate has been recorded.
Not relevant Not relevant Not relevant Not relevant
Cancer pagurus is not known to compete with or be affected by any non-native species.
Intermediate High Low High
All around Britain and Ireland there are substantial fisheries for Cancer pagurus (Bennett 1979; 1995; Brown & Bennett, 1980; Eaton et al., 2001; Fahy, et al., 2002; Howard, 1982), which although causing significant mortality, are regulated by minimum landing sizes introduced in the 19th century. Also the biology of Cancer pagurus protects the sustainability of the fishery as berried females do not feed and are rarely caught in baited pots (Howard, 1982). Therefore an intolerance of intermediate has been recorded.
Low Very high Very Low Very low
Many of the prey items of Cancer pagurus are also commercially exploited especially large bivalves. If populations of prey items were overexploited it is likely that the populations of Cancer pagurus would either decrease or growth would be slower leading to later maturation.

Additional information

Recoverability
Female Cancer pagurus have high fecundity of 0.25 - 3 million eggs per spawning (Bennett, 1995) but mortality of larvae is high. Since juveniles spend the first 3 years post -settlement in the intertidal (Regnault, 1994), recovery of an adult population from a mortality event is likely to take several years. If Cancer pagurus were to be completely eradicated from an area, repopulation would occur by larval input from surrounding areas and adult migration (Bennett & Brown, 1983; 1976). Due to circular water movements, it is thought that at least the population around the Dogger Bank, near northeast England may self contained (Eaton et al., 2001) and other populations around the British Isles may be isolated from larval supply from adjacent populations as well.

Importance review

Policy/legislation

- no data -

Status

National (GB) importance-Global red list (IUCN) category-

Non-native

Native-
Origin- Date Arrived-

Importance information

-none-

Bibliography

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Citation

This review can be cited as:

Neal, K.J. & Wilson, E. 2008. Cancer pagurus Edible crab. In Tyler-Walters H. and Hiscock K. (eds) Marine Life Information Network: Biology and Sensitivity Key Information Reviews, [on-line]. Plymouth: Marine Biological Association of the United Kingdom. Available from: http://www.marlin.ac.uk/species/detail/1179

Last Updated: 08/05/2008