The section is now dynamically updated from the NAS database to ensure that it contains the most current and accurate information. Occurrences are summarized in Table 1, alphabetically by state, with years of earliest and most recent observations, and the tally and names of drainages where the species was observed. The table contains hyperlinks to collections tables of specimens based on the states, years, and drainages selected. References to specimens that were not obtained through sighting reports and personal communications are found through the hyperlink in the Table 1 caption or through the individual specimens linked in the collections tables.

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The primary habitat of H. In the Western Pacific the distribution of H. Reproduction Gerard et al. Planktonic larval stages, which last for about a month under optimal temperature and salinity conditions Epifanio et al.

Growth and maturation are rapid: newly settled juveniles have a mean carapace width CW around 2mm and reach 20mm in about two years Fukui, The crabs become reproductively mature at this age and, although growth is slower in mature crabs, they can reach a maximum CWof 40mm, corresponding to a maximum lifespan of around eight years. In southern parts of Japan, the breeding season is 8 months long Fukui , whereas in northern Japan, it lasts 3 months Takahashi et al.

Laboratory investigations of the effects of predator sex and size on prey selection by the Asian crab, Hemigrapsus sanguineus.

Benson, Hemigrapsus sanguineus. Full account PDF. Hemigrapsus sanguineus is commonly called the Asian shore crab and is native to the Asia-Pacific region.

It has a very broad diet and, in its introduced range, has the potential to affect populations of native species, such as crabs, fish and shellfish by disrupting the food web. It also occupies habitats very similar to native mud crabs. Hemigrapsus sanguineus may compete with larger species, like the blue crab, rock crab and the non-native green crab. Species Description. Hemigrapsus sanguineus has several distinguishing characteristics.

It has a somewhat square carapace which is usually patterned and dark in colour, ranging from brownish orange to greenish black. Each side of the carapace has three distinct anterolateral teeth. Male crabs possess a fleshy knob at the base of the dactyl of the cheliped, as well as relatively larger and more robust claws than females Ledesma and O'Connor, The abdomen of mature females is wider than that of male crabs Mcdermott a.

In their studies, Jensen et al. This typically did not involve overt aggression or chelae displays on the part of the H. The females are capable of producing 50, eggs per clutch with clutches per breeding season. The larvae are suspended in the water for approximately one month before developing into juvenile crabs. Hemigrapsus sanguineus inhabits any shallow hard-bottom intertidal or sometimes subtidal habitat, with the highest densities occurring at the middle and lower intertidal elevations.

It can live on artificial structures and on mussel beds and oyster reefs, and is usually found under the shelter of rocks, shells and other debris on tidal flats.

It will search along the fringe of tidal flats as the tide recedes for unusused burrows to occupy. Lohrer et al. It coexists with mud crabs in the family Xanthidae, juvenile green crabs Carcinus maenas , and occasionally the rock crab, Cancer irroratus Benson, ; Brousseau et al.

Gerard et al. Principal source: Brousseau et al. General Impacts. Hemigrapsus sanguineus has the potential to cause significant changes in the inshore marine and estuarine communities of southern New England and mid-Atlantic coast, and predation by H.

The intertidal distribution of H. Furthermore, H. It is debatable whether there is evidence that H. Jensen, pers. Brousseau et al. Laboratory studies have shown that H. The high densities of H. Preventative measures : Ballast water management is being researched to reduce or eradicate new introductions from occurring. Scientists are monitoring changes in native species, tracking the shore crab's spread along the US Atlantic coastline, and conducting experiments to increase their knowledge of basic biology and ecology of this species Benson, Biological : It is possible that species such as tautogs, drums, sheepshead and seagulls prey upon H.

Parasites, which help control populations of H. Countries or multi-country features with distribution records for Hemigrapsus sanguineus. Informations on Hemigrapsus sanguineus has been recorded for the following locations. Click on the name for additional informations.

Details of Hemigrapsus sanguineus in information. Management notes for this location. Start date:. Ecosystem services:. Management information. Benson, A. Decision support tools-Identifying potentially invasive non-native marine and freshwater species: fish, invertebrates, amphibians.

Summary: The electronic tool kits made available on the Cefas page for free download are Crown Copyright As such, these are freeware and may be freely distributed provided this notice is retained.

No warranty, expressed or implied, is made and users should satisfy themselves as to the applicability of the results in any given circumstance. Pheloung, P. Halloy Hayes, K. Summary: This report is the final report of a two year study designed to identify and rank introduced marine species found within Australian waters potential domestic target species and those that are not found within Australian waters potential international target species.

Ahl, R. Status of the nonindigenous crab, Hemigrapusus sanguineus , at Greenwich Point Northeastern Naturalist 6 3 : Bourdeau, P. Prey preferences of the recently introduced Western Pacific Shore Crab, Hemigrapsus sanguineus , feeding on molluscs and macroalgae in Southeastern Massachusetts. Massachusetts Institute of Technology, Cambridge, MA Summary: Prey of different sizes were offered to the newly introduced crab to see which they preferred. Brandhagen, M. Geographic differentiation of an introduced crab species Hemigrapsus sanguineus on the Atlantic coast of North America.

Breton G. Faasse, P. Noel, and T. A new alien crab in Europe. Hemigrapusus sanguineus Brachyurea: Grapsidae. Journal of crustacean biology 22 1 : Brousseau, D. Filipowicz, and J. Laboratory investigations of the effects of predator sex and size on prey selection by the Asian crab, Hemigrapusus sanguineus.

Kriksciun, and J. Fiddler crab burrow usage by teh Asian crab, Hemigrapusus sanguineus , in a Long Island Sound salt marsh. Northeastern Naturalist 10 4 Casanova, T.

New Orleans, LA Summary: The Japanese shore crab was found to be having a negative impact on the green crab population. DeGraaf, J. Northeastern Naturalist: Vol. Epifanio, C. Interactions between the asian shore crab Hemigrapsus sanguineus and the common mud crab Panopeus herbstii : Larval supply vs post-settlement competition. Scripps Institution of Oceanography La Jolla, California Summary: The displacement of the native common mud crab by the invasive asian shore crab maybe due to competition at a post-larval stage.

Gerard, V. Cerrator, and A. Potential impacts of a western Pacific grapsid crab on intertidal communities of the northwestern Atlantic Ocean. Biological Invasions 1: , Jensen, G. McDonald, D. East meets west: competitive interactions between green crab Carcinus maenas , and native and introduced shore crab Hemigrapsus spp. Mar Ecol Prog Ser Vol.

Kraemer, G. Larson, A.


Hemigrapsus sanguineus (De Haan, 1835)

Diane J. Brousseau, Jenny A. The Asian shore crab, Hemigrapsus sanguineus De Haan, , is an opportunistic omnivore with well-developed predatory tendencies and a strong preference for animal food items over algae. There were no significant differences in food preference between sexes or between juvenile and adult crabs. Relative abundance of food type, either algal or animal, in small food patches did not affect crab food preference. Crabs with prolonged starvation periods 5-d , however, consumed both food types more often than those that had been starved for 1-d only. Experiments to determine the effect of conspecifics on food selectivity showed that increased crab density leads to increased diet breadth, suggesting that competition for food can alter food selection patterns of H.


The following information was supplied regarding data availability:. The raw data are provided in the Supplemental Files. The invasive Asian shore crab, Hemigrapsus sanguineus , is ubiquitous in the rocky intertidal zone of the western North Atlantic. A likely contributor to this colonization is that H. This study investigated the salinity effects on this animal by observing survival across a range of salinities, the maintenance of hemolymph osmolality under different salinities, and behavioral preference for and avoidance of salinities. Such results suggest H.

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