Crab, brown or edible
Capture method — Pot or creel
Capture area — North East Atlantic (FAO 27)
Stock area — Southern North Sea
Stock detail — IVc
The status of the crab stock in the southern North Sea is unknown. Exploitation is moderate and although reduced for females since the last assessment in 2012 it is very near the maximum. The minimum size limit is lower in this region and there may be some concern surrounding this. Avoid eating crabs below the minimum landing size (13-14cm in most areas of the UK) or bite size crabs at 11.5 cms and crab claws, unless it is certain they have been removed from the crab body after landing. Egg-bearing or “berried” females should be avoided at all times to allow them to spawn.
The brown crab is commonly found in the North Atlantic Ocean, North Sea, less so in the Mediterranean. It is the heaviest British crab and easily identified by a characteristic pie-crust edge to the carapace or shell. They are found in waters down to 100 m. Brown crabs are highly fecund. Mating activity peaks in the summer when the female has moulted with spawning occurring in the late autumn or winter. Egg carrying females are largely inactive over the winter brooding period before the eggs hatch in the spring and summer. Between 250,00 to 3,000,000 eggs are held by the female for 8 months until they hatch into planktonic larvae. After around five weeks in the plankton, the crab larvae settle on the seabed. Juvenile crabs settle in the intertidal zone and remain in these habitats for 3 years, until they reach 6-7 cm carapace width, at which time they migrate to subtidal habitats. The crab is encased in a hard, rigid shell, which, like other crustaceans, has to be shed at intervals to permit growth. Moulting takes place at frequent intervals during the first years of a crab’s life, but only every two years after it is grown and this is mirrored by a slowing of growth rate. Growth is dependent on the frequency of moulting as well as the increase in size on each moulting occasion and it typically takes about four or five years for a juvenile crab to grow to commercial size. They can grow up to about 25 cm carapace width, with the larger specimens inhabiting deeper water. Growth rate varies between areas, and animals will typically reach a minimum landing size of 140mm carapace width at 4 to 6 years old. Environmental variables e.g. sea temperature related to geographical area and fishing pressure affect the size of maturity with animals in more northerly latitudes growing and maturing more slowly. Minimum landing sizes vary around the British coast from 150mm in the Western Channel to 115 mm in Norfolk for example. Edible crabs can live for up to 100 years but average age is around 25 to 30 years, and sexual maturity is reached after approximately 10 years, but can be as early as 3 to 4 years. Female brown crabs in Scottish waters typically mature between 130 and 150 mm CW. In Orkney research has shown that sexual maturity can be reached at 115 to 120 mm. The sex of a brown crab can be determined by the shape of the abdomen; the males being narrow and the females being broad and rounded for carrying eggs. Stock boundaries for edible crab remain poorly understood and both sexes move quite widely at times; females in particular have been shown to travel large distances in relation to spawning activity.
Southern North Sea
Brown crab is widely distributed in coastal waters of the Mediterranean, Atlantic, English Channel and North Sea. There are five Crab Fishery Units (CFU) defined for England. Cefas publishes stock status reports for each of the areas every 2 years, although the latest report available was published in 2014. The status of the stock of edible crab in area Southern North Sea is unknown. Changes in the way landings have been recorded in 2006 and 2009 mean the data are inconsistent and unsuitable for assessment. Calculations of fishing mortalities are unaffected by the issues with landings and mortality rates are high, around the maximum reference point limit for females. The status of the stock has changed since the last assessment in 2012, as the females fishing mortality estimate has dropped below the maximum reference limit.
There are a range of measures available for the management of crab stocks including but not limited to: licensing; limited entry; closed seasons and areas; minimum and maximum landing sizes; prohibitions on landing of berried crabs, soft crabs or crab parts; use of crabs as bait; trap limits and size; use of escape vents; biodegradable panels; vessel size and power; and use of VMS or vessel monitoring systems, which may be introduced at the EU or national and regional or local level. A restrictive licensing scheme for shellfish was introduced in UK waters in 2004, and increased monitoring of landings and effort was introduced in 2006 for boats under 10m in length in all areas of the UK. EC legislation sets a minimum landing size of 130mm for crabs in the North Sea south of 56 degrees N. It also restricts the proportion of the crab landings which is detached claws caught by pots or creels to less than 1% by weight of total catch. A by-catch limit of no more than 75kg per day of crab claws taken by other gear types can be landed. National legislation restricts the number of shellfish licences available (in England and Wales) and also prohibits landing of berried and soft crabs. A derogation to the EC legislation sets an MLS of 115mm in the Eastern IFCA area. In coastal waters out to 6 miles, potting is regulated by a number of Inshore Fishery Conseration Authority (IFCA) byelaws. This stock represents one of five Crab Fishery Units (CFU) defined for England. In this region there is a ban on using edible crabs as bait; landing of claws; escape gaps in pots; and towed gear restrictions in the Eastern IFCA area. Minimum landing size for crabs in the Norfolk area are 115 mm carapace width, 1.5 mm lower than other areas of the UK. There is no pot limit enforced.
Brown (or edible) crab is the most valuable crab species exploited around the coasts of England and Wales with landings in 2011 of around 12,000t,worth in excess of 19 million pounds at first sale. Pots are a highly selective method of fishing. Undersized animals can be returned to the sea alive. However, many pots in use now (known as parlour pots), combined with mechanical hauling and increasing numbers of pots, have contributed to the potential unsustainability of the fishery in many areas. The legal minimum landing size for brown crab in European waters ranges from 14cm (north of 56 degrees North) to 11.5cm (Eastern IFCA District) depending on area of capture. Turtles may, but rarely, become entangled in ropes used to buoy pots.
Based on method of production, fish type, and consumer rating: only fish rated 2 and below are included as an alternative in the list below. Click on a name to show the sustainable options available.Abalone
Clam, Manila (Farmed)
Clam, Manila, Japanese carpet shell (Caught at sea)
Clam, Razor, clams
Crab, brown or edible
Crab, velvet swimming
Crawfish, Red Swamp
Crayfish or crawfish
Lobster, Norway, Langoustine, Dublin Bay prawn or scampi
Mussel, mussels (Caught at sea)
Mussel, mussels (Farmed)
Oyster, Native, oysters (Caught at sea)
Oyster, Native, oysters (Farmed)
Oyster, Pacific, oysters
Prawn, Endeavour, Greasy back
Prawn, King (whiteleg), prawns
Prawn, Northern, prawns
Prawn, Tiger, prawns
Scallop, Queen, scallops
Squid, Japanese flying
ReferencesCefas. 2014. Edible crab (Cancer pagarus) Stock Status Report. https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/462265/2014_Crab_assessments.pdf (Accessed 6 November 2017)