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The carapace width of mature Dungeness crabs may reach 25 cm (9.8 in) in some areas off the coast of Washington, but are typically under 20 cm (7.9 in). [22] They are a popular delicacy, and are the most commercially important crab in the Pacific Northwest, as well as the western states generally. [23]
Mangrove crabs are predated on by wading birds, fish, sharks, [8] monkeys, hawks, and raccoons. [7] The larvae of mangrove crabs is a major source of food for juvenile fish in waterways near the crabs. [24] Adult mangrove crabs are food for the crab plover among other protected species. [17] To protect themselves the crabs can climb trees. [25]
Crabs and sea-spiders are defined as including "Atlantic rock crab, black stone crab, blue crab, blue swimming crab, dana swimcrab, dungeness crab, edible crab, cazami crab, geryons nei, green crab, hair crab, harbour spidercrab, Indo-Pacific swamp crab, jonah crab, marine crabs nei, Mediterranean shore crab, Pacific rock crab, portunus ...
The practice of eating live seafood, such as fish, crab, oysters, baby shrimp, or baby octopus, is widespread. Oysters are typically eaten live. [ 1 ] The view that oysters are acceptable to eat, even by strict ethical criteria, has notably been propounded in the seminal 1975 text Animal Liberation , by philosopher Peter Singer .
Even the rocking of the boat can cause damage to the crabs, so boards are inserted in the holds to prevent excessive side-to-side movement. If a crab dies in the hold for any reason, it releases toxins that can kill other crabs. If the crew fails to remove the dead crabs, they can poison the entire tank and ruin the catch [citation needed].
Stone crabs can be found in 1 ⁄ 2 –3 ft (15–90 cm) deep holes near dock pilings in water 1–5 ft (30–150 cm) deep. Oftentimes the hole will have shells around the opening; the crab uses the shell as a digging tool for the hole construction.
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More than 1,300 described species of freshwater crabs are known, out of a total of 6,700 species of crabs across all environments. [1] The total number of species of freshwater crabs, including undescribed species, is thought to be up to 65% higher, potentially up to 2,155 species, although most of the additional species are currently unknown to science. [1]