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When the tub of crab fills up, Alewine, his hands covered in thick rubber gloves, begins the job of sorting the crab by size and quality. To legally keep a crab, it must measure 5 inches between ...
Crabs vary in size from the pea crab, a few millimeters wide, to the Japanese spider crab, with a leg span up to 4 m (13 ft). [6] Several other groups of crustaceans with similar appearances – such as king crabs and porcelain crabs – are not true crabs, but have evolved features similar to true crabs through a process known as carcinisation .
The legal size of crabs is 6.25 in (159 mm) in California, Oregon, and Washington [4] [5] and 6.5 in (170 mm) in Alaska and Canada. [ 3 ] [ 7 ] Crabs typically reach legal size at three to five years depending on location (Alaska has much slower growth).
It is a straight-line measure, not measured over the curve of the body. [ 2 ] Standard length measurements are used with Teleostei (most bony fish ), while total length measurements are used with Myxini ( hagfish ), Petromyzontiformes ( lampreys ) and usually Elasmobranchii ( sharks and rays ), as well as some other fishes.
Two snow crabs with the larger male perched on top of the female, Bonne Bay, Newfoundland, Canada. The snow crab grows slowly and is structured according to its size. At least 11 stages of growth for male crabs are recognized. Usually, the male crabs are almost twice the size of the female crabs. [4]
The carapace width has been measured in size from 40 to 80 millimetres (1.6 to 3.1 in). [4] Being a lithode crab it has an asymmetrical body. [5] Diet of the scaled crab is known to include brittle stars as they have been witnessed feeding on the echinoderms.
The crabs are typically caught using small trawling nets. [23] The population has decreased in number due to overfishing, forcing fishermen into exploring deeper waters to catch them. The average size caught by fishermen is a legspan of 1.0–1.2 m (3 ft 3 in – 3 ft 11 in). [17]
The coconut crab (Birgus latro) is a terrestrial species of giant hermit crab, and is also known as the robber crab or palm thief. It is the largest terrestrial arthropod known, with a weight of up to 4.1 kg (9 lb). The distance from the tip of one leg to the tip of another can be as wide as 1 m (3 ft 3 in).