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Portunus is a genus of crabs which includes several important species for fisheries, such as the blue swimming crab and the Gazami crab. [3] Other species, such as the three-spotted crab are caught as bycatch. [4] Fossil of Portunus convexus. The genus Portunus contains 13 extant species and another 26 species known only from fossils.
Portunus trituberculatus, known as the horse crab, known as the gazami crab or Japanese blue crab, is the most widely fished species of crab in the world, with over 300,000 tonnes being caught annually, 98% of it off the coast of China. [5] Horse crabs are found from HokkaidÅ to South India, throughout Maritime Southeast Asia and south to ...
This is unsurprising considering that mangrove leaves are of poor nutritional value, but what is surprising is the high proportion of leaf matter in the crabs' diet. This may be a response to the greater risk of predation in the water than in the canopy. [8] The mangrove tree crab is preyed on by birds, terrestrial mammals, and larger crabs. It ...
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]
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As of 2007, after six years of planting, 700,000 mangroves are growing; providing stock feed for sheep and habitat for oysters, crabs, other bivalves, and fish. [ 121 ] [ 122 ] Another method of restoring mangroves is by using quadcopters (which are able to carry and deposit seed pods).
The Speckled swimming crab eats primarily detritus, but have also been recorded eating fish, mollusks, and other crustaceans. [7] They ambush prey that go near their buried bodies. [7] Speckled swimming crabs have been recorded capturing sea turtle hatchlings. [7] Sea turtles are the primary predator to Arenaeus cribrarius. [7]
The crabs can travel up to 1.46 km (0.91 mi) in a day, and up to 4 km (2.5 mi) in total. [4] Only a few land crabs, including certain Geosesarma species, have direct development (the mother carries the eggs until they have become tiny, fully developed crabs), and these do not need access to water to breed.