chemicals released into air or water that are detected by and responded to by other animals of the same species. having body symmetry such that the animal can be divided in one plane into two mirror-image halves. There have been difficulties in carrying out this plan though. Chinese mitten crab (Eriocheir sinensis) • Hairy, white tipped claws • See factsheet for more information. ("Eriocheir Sinensis (Milne Edwards, 1853)", 2003; Clark and Hemsley-Flint, 2007; Gollasch, 2006), Mitten crabs are a delicacy in Asia and other places. ("Chinese Mitten Crab: Life and History", 1998; Gollasch, 2006; Metzler, 1998; Robbins, et al., 2007), After the fertilized eggs hatch, they are called zoea and do not look like adults. Like the blue crab, its common name comes from the color of its shell; it is usually cream to tan in color. Accessed It is not clear how the crabs communicate during their migration, but it is speculated that there is an environmental cue, which triggers the migration. 3) The larvae gradually move from brackish water to fresh water. Mitten crabs spend most of their life in fresh water and return to the sea to breed. "Mitten Crabs: Oriental Invaders of the River Thames" During physical contact, males are able to recognize reproductively active females because the females release contact pheromones; they are only released after physical contact has been made. ("Chinese Mitten Crab: Life and History", 1998), Males and females come in contact and after initially fighting, mating behavior begins. While ADW staff and contributors provide references to books and websites that we believe are reputable, we cannot necessarily endorse the contents of references beyond our control. These crabs migrated from China to Europe as early as 1900 and were first documented by official German reports in 1912 from Aller River. Males and females are dimorphic: males have a V-shaped abdomen whereas the females have a U-shaped abdomen. Synapomorphy of the Bilateria. Crabs damage crops in China by consuming rice shoots. During migration they are known to cross terrestrial boundaries, but they do not spend much time on land. that region of the Earth between 23.5 degrees North and 60 degrees North (between the Tropic of Cancer and the Arctic Circle) and between 23.5 degrees South and 60 degrees South (between the Tropic of Capricorn and the Antarctic Circle). 2006. associates with others of its species; forms social groups. Herborg, L., M. Bentley, A. Clare, K. Last. Accessed "Eriocheir Sinensis (Milne Edwards, 1853)" It has 8 sharp-tipped walking legs that are more than twice as … Chinese Mitten Crab Scientific Name. The Animal Diversity Web is an educational resource written largely by and for college students. Disclaimer: The mitten crab diet is omnivorous. 1998. at http://www.iisgcp.org/exoticsp/Chinese_Mitten_Crab.htm. Topics [20] Most of the Yangcheng crabs are exported to Shanghai and Hong Kong, and high-profit foreign markets. American Fisheries Society Special Publication 31 : Reference for: Eriocheir sinensis, Chinese mitten crab [English] Source: NODC Taxonomic Code, database (version 8.0) Acquired: 1996 : Notes: Reference for: The Animal Diversity Web team is excited to announce ADW Pocket Guides! The Museum. ("Chinese Mitten Crab: Life and History", 1998), In fresh water the juvenile crabs burrow into the banks in order to escape predators and desiccation. Metzler, J. The Chinese mitten crab is an omnivore. Biology of the Genus Eriocheir Identification and Life History Eriocheir sinensis (Chinese mitten crab) is native to the rivers and estuaries of central Asia, from Mitten crab can be In otherwords, Europe and Asia and northern Africa. ("National Management Plan For the Genus Eriocheir (Mitten Crabs)", 2003), Eriocheir sinensis is catadromous: adult Mitten Crabs live in fresh water, but migrate to salt water for reproduction. Remarks: Three other species of the genus Eriocheir are occuring in Asia: E. japonicus de Haan, E. leptognathus Rathbun and E. rectus Stimpson. [16], The Smithsonian is tracking the spread of the Chinese mitten crab and seeking help to determine the current distribution status of the mitten crab in the Chesapeake Bay region. ("Mitten Crab Projects", 2007), Chinese mitten crabs are light brown and have hairy claws that are typically white-tipped, giving the appearance of mittens. McLaughlin et al. This is evident as this species has been spread via shipping to North America as well as Europe. This regulation requires Chinese mitten crab to be destroyed unless lawfully held under a license or permit to collect, possess or sell for propagation, scientific or exhibition purposes issued under section 11-0515 of the Environmental Conservation Law. [8], Starts off as a fresh-water organism. (On-line). Legs are developed which allow the juvenile crab to migrate upriver towards brackish water and finally to fresh water environment. They return to brackish water in the spring to hatch their eggs. The crab is found in subtropical and temperate regions.[8]. [11] The crabs have also been known to take up residence in swimming pools. Mating Behaviour and Chemical Communication in the Invasive Chinese Mitten Crab Eriocheir sinensis. mainly lives in oceans, seas, or other bodies of salt water. In this stage, they spend 1 to 2 months in brackish water before migrating upstream for further development. Clark, P., B. Hemsley-Flint. ADW doesn't cover all species in the world, nor does it include all the latest scientific information about organisms we describe. All the following efforts were attempted but showed little improvement: "catch as many as you can", migration barriers, trapping, raising awareness, electrical screens, and pulses. 3. referring to animal species that have been transported to and established populations in regions outside of their natural range, usually through human action. There is concern in areas with a substantial native crab fishery, such as the Chesapeake Bay in Maryland and the Hudson River in New York (both locations where the crabs were first spotted in 2005), as the impact of the invasion by this species on the native population is unknown. In the Yangtze, the largest river in its native range, Chinese mitten crabs have been recorded up to 1,400 km (870 mi) upstream. The Mitten Crab can be donated to the museum. [19] The crab meat is believed by TCM practitioners to have a "cooling" (yin) effect on the body. 1998. [21][22] Concerns have been raised that the population and origin of the crab may be affected because of overfishing of the species in the Yangtze. This material is based upon work supported by the Other strategies such as capturing them when they pile up at dams have proven somewhat effective. People are encouraged to report any mitten crab sightings, along with details (date, specific location, size) and a close-up photograph or specimen if possible. The crab's legs are twice as long as the width of its shell, and its hairy, white-tipped claws resemble mittens. The hard outer covering (carapace) has 4 spines on each side but is mostly smooth and round; width up to 10 cm (up to 4 in.). Recently, a Chinese businessman introduced vending machines to sell this species of crab in the subways. Chinese mitten crab, known as Chinese hairy crab, is named for its furry claws. National Science Foundation Eri­ocheir sinen­sis mi­grates down­stream to salt­wa­ter en­vi­ron­ments to re­pro­duce. Contributor Galleries Classification, To cite this page: It is native to Asia. October 13, 2007 Chinese Mitten Crab (Eriocheir sinensis) What is it? Chinese mitten crabs prefer to moult in freshwater but are unable to lay eggs at low salinities. (On-line). Eriocheir sinensis migrates downstream to saltwater environments to reproduce. 2003. ("Chinese Mitten Crab: Life and History", 1998), Mitten crabs are prey for many animals. Chinese mitten crabs are found on coasts from Japan to the mainland of China, Korean Peninsula, and along the Yellow Sea; they are also found on the coasts of northern and eastern Europe and the United States. Common Names: Mitten crab, Shanghai crab, Chinese Mitten crab. Adults migrate to estuaries and the sea to breed. (PDF 58 KB) Scientific Name: Melithaeidae: Melithaea sp. at http://www.nhm.ac.uk/nature-online/life/other-invertebrates/chinese-mitten-crabs/chinese-mitten-crabs.html. at http://www.issg.org/database/species/ecology.asp?si=38&fr=1&sts=. For example, diseases caused by infection of filarial nematodes (elephantiasis and river blindness). The males arrive first and stay in the brackish waters all winter. October 13, 2007 living in the northern part of the Old World. A large change in the shape or structure of an animal that happens as the animal grows. ("Chinese Mitten Crab: Life and History", 1998; "Eriocheir Sinensis (Milne Edwards, 1853)", 2003; Rainbow, et al., 2003), During the summer months mature Chinese mitten crabs begin their migration to the sea, with males arriving first and females arriving afterwards.