- Summary of Invasiveness
- Taxonomic Tree
- Notes on Taxonomy and Nomenclature
- Distribution Table
- History of Introduction and Spread
- Risk of Introduction
- Habitat List
- Biology and Ecology
- Water Tolerances
- Natural enemies
- Notes on Natural Enemies
- Means of Movement and Dispersal
- Pathway Causes
- Pathway Vectors
- Impact Summary
- Economic Impact
- Environmental Impact
- Risk and Impact Factors
- Similarities to Other Species/Conditions
- Prevention and Control
- Gaps in Knowledge/Research Needs
- Links to Websites
- Distribution Maps
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PicturesTop of page
IdentityTop of page
Preferred Scientific Name
- Rhithropanopeus harrisii (Gould, 1841)
Other Scientific Names
- Heteropanope tridentata (De Man, 1892)
- Heteropanope tridentata (Tesch, 1922)
- Pilumnus harrisii (Gould, 1841)
- Pilumnus tridentatus (Maitland, 1874)
- Rhithropanopeus harrisii (Rathbun, 1930)
- Rhithropanopeus harrisii ssp. tridentatus (Buitendijk and Holtuis, 1949)
International Common Names
- English: dwarf crab; estuarine mud crab; Harris mud crab; white-fingered mud crab; white-tipped mud crab; Zuiderzee crab
- Russian: golandsky crab
Local Common Names
- Denmark: ostamerikansk brakvandskrabbe
- Germany: Zuiderzeekrabbe
- Netherlands: zuiderzeekrabbetje
- Poland: krabik amerykanski
Summary of InvasivenessTop of page
R. harrisii is a small brackish water crab which belongs to the superfamily Xanthidae. It is native to the Atlantic coast of North America but has been introduced accidentally in over 20 different countries spanning both North and South America, Europe, northern Africa, and Asia (Roche and Torchin, 2007; Roche et al., 2009). Although R. harrisii has not yet been reported in Oceania, it figures among the top 30 species of concern from a list of 851 marine pests likely to invade Australia (Hayes and Sliwa, 2003). Possible vectors of introduction include accidental transport in vessel fouling, ballast water, and oyster shipments (Cohen and Carlton, 1995) as well as with fish stocking (Keith, 2008). Currently, no studies have quantified the impacts of R. harrisii on communities where it is introduced, but anecdotal evidence suggests that it may alter species interactions and cause some economic damage, notably through competition with native species, alteration of food webs, and fouling of water intake pipes (Roche and Torchin, 2007). R. harrisii’s tolerance to a broad range of environmental conditions, mainly salinity and temperature, is thought to have facilitated its success as a global invader (Williams, 1984; Petersen, 2006).
Taxonomic TreeTop of page
- Domain: Eukaryota
- Kingdom: Metazoa
- Phylum: Arthropoda
- Subphylum: Crustacea
- Class: Malacostraca
- Subclass: Eumalacostraca
- Order: Decapoda
- Suborder: Reptantia
- Unknown: Xanthoidea
- Family: Panopeidae
- Genus: Rhithropanopeus
- Species: Rhithropanopeus harrisii
Notes on Taxonomy and NomenclatureTop of page
Rhithropanopeus harrisii (Gould, 1841), or the Harris mud crab, is a small euryhaline crab which reaches approximately 2 cm in carapace width as an adult and is greenish-brown in colouration. Its chelipeds are white at the tip and unequal in size. The front of its carapace is almost straight, slightly notched, with its margin transversely grooved, appearing double when viewed from the front. Four teeth (spines) line the side of its carapace below the eyestalks and its eight walking legs are long, thin and somewhat hairy (Ryan, 1956; Williams, 1984; Zaitsev and Öztürk, 2001). Illustrations of the crab are available in Williams (1984), in Christiansen (1969), and in Galil et al. (2002).
DescriptionTop of page
R. harrisii is a small euryhaline crab < 26 mm carapace width) which belongs to the family Panopeidae (mud crabs). Descriptions of the crab in its native range are provided in Rathbun (1930), Ryan (1956), Christiansen (1969), Williams (1984), and Galil et al. (2002) and are summarized below. The carapace is subquadrate and greatest in width at the fourth pair of lateral teeth, which line its sides below the eyestalks. The carapace is transversally and latitudinally convex. The front is slightly notched with its margin transversally grooved, appearing double when viewed from the front. The lateral teeth are not prominent and the first and second teeth are fused. The third, fourth and fifth teeth are blunt, pointing obliquely upward. The male’s abdomen has five segments: the third segment does not reach the coxae of the last pair of walking legs and the terminal segment has a rounded tip. The chelae are unequal in size and dissimilar. The major chela has a short fixed carpus and a strongly curved dactyl. The dactyl has a moderately developed basal tooth. The carpus has a subdistal groove and a tooth at an inner angle. The upper surface of the carpus is granular in juveniles, but smooth in adults. The walking legs are long, slender, compressed and somewhat hairy. The antennules have black chromatophores. The crab is generally brownish-green in colour with maroon blotches, but is often stained with bottom mud. The chelae are light at the tips with spots on the upper surface.
DistributionTop of page
In its native range, R. harrisii inhabits brackish waters along the east coast of North America from the Miramichi Estuary in New Brunswick, Canada, to Veracruz in the Gulf of Mexico (Williams, 1984). Although recent publications cite a record of this species from Brazil, (e.g., Morgan et al., 1988; Abele and Kim, 1989; Gonçalves et al., 1995b; Zaitsev and Öztürk, 2001), the specimens originally reported by Williams (1965) were later re-examined and reclassified as another species by the same author (Williams, 1984). Currently, R. harrisii has been reported as a non-indigenous species in over 20 different countries (Roche and Torchin, 2007; Roche et al., 2009).
Distribution TableTop of page
The distribution in this summary table is based on all the information available. When several references are cited, they may give conflicting information on the status. Further details may be available for individual references in the Distribution Table Details section which can be selected by going to Generate Report.
|Continent/Country/Region||Distribution||Last Reported||Origin||First Reported||Invasive||Reference||Notes|
|Atlantic, Northeast||Localised||Introduced||Wolff, 1954|
|Atlantic, Northwest||Widespread||Native||Not invasive||Williams, 1984||Native range - up to New Brunswick (Canada)|
|Atlantic, Western Central||Present||Williams, 1984; Roche and Torchin, 2007|
|Mediterranean and Black Sea||Present||Marchand and Saudray, 1971; Ben et al., 2004|
|Pacific, Eastern Central||Localised||2001||Introduced||Petersen, 2006||Oregon, California|
|Azerbaijan||Widespread||Introduced||Zaitsev and Öztürk, 2001||First recorded in the South Caspian Sea in 1961|
|Iran||Widespread||Introduced||Zaitsev and Öztürk, 2001||In 1970s, 760 ind/m2 in southeastern portion of Caspian Sea (Kasymov et al. 1974 cited in Zaitsev and Ozturk, 2001)|
|Japan||Present||Present based on regional distribution.|
|-Honshu||Localised||Introduced||Iseda et al., 2007||It was discovered in 2006 in Nagoya Canal in Nagoya City, Aichi prefecture (Honshu). 47 males, 39 females (8 ovigerous) were collected. The authors reanalyzed old samples from Kimura & Horii (2000) and found the R. harrisii had invaded the port of Nagora prior to the year 2000. They also suggest that their colleagues found R. harrisii in the ports of Nagoya, Osaka Bay and Tokyo Bay|
|Kazakhstan||Widespread||Introduced||Zaitsev and Öztürk, 2001||Northeastern part of Caspian Sea|
|Turkmenistan||Widespread||Introduced||Zaitsev and Öztürk, 2001||Area of first discovery in Caspian Sea - 1961|
|Uzbekistan||Localised||Introduced||Andreyev and Andreyeva, 1988||Southern part of Aral Sea - first recorded in 1971|
|Tunisia||Present, few occurrences||Introduced||Ben et al., 2004||First recorded in 2003 in the South Tunis Lagoon (2 females, 7 and 12 mm cw)|
|Canada||Present||Present based on regional distribution.|
|-New Brunswick||Localised||Native||Not invasive||Williams, 1984||Northernmost part of native range - restricted to estuaries|
|Mexico||Localised||Native||Not invasive||Williams, 1984||Southernmost part of native range - restricted to estuaries|
|USA||Present||Present based on regional distribution.|
|-California||Localised||Introduced||Jones, 1940; Petersen, 2006; Petersen, 2006|
|-Delaware||Localised||Native||Not invasive||McDermott and Flower, 1952||Upper Delaware Bay|
|-Florida||Localised||Native||Not invasive||Odum and Heald, 1972||Estuaries streams in southern Florida|
|-Maryland||Widespread||Native||Not invasive||Ryan, 1956||Chesapeake Bay|
|-North Carolina||Localised||Native||Petersen, 2006||Neuse River|
|-Oregon||Localised||Introduced||Petersen, 2006; Petersen, 2006|
|-Texas||Localised||Williams, 1984; Keith, 2008|
|-Virginia||Widespread||Native||Not invasive||Ryan, 1956||Chesapeake Bay|
Central America and Caribbean
|Panama||Present||Introduced||Abele and Kim, 1989; Roche and Torchin, 2007; Roche et al., 2009|
|Brazil||Absent, invalid record||Introduced||Williams, 1965||Specimens originally reported by Williams (1965) were later re-examined and reclassified as another species by the same author (Williams, 1984)|
|Venezuela||Absent, unreliable record||1956||Introduced||Rodríguez, 1963||Reported from the estuary of Lake Macaraibo at salinities between 2 and 22 ppt|
|Belgium||Present||Introduced||Adema, 1991; DAISIE European Invasive Alien Species Gateway, 2009|
|Bulgaria||Present||Introduced||Marchand and Saudray, 1971||First recorded in 1948 from the Black Sea (Beloslav Lagoon)|
|Denmark||Localised||Introduced||Wolff, 1954||First recorded in 1953 in Copenhagen Harbour|
|France||Present||Introduced||Saudray, 1956; Marchand, 1972; Marchand, 1979; Noël, 2001|
|Germany||Present||Introduced||Schubert, 1936; Nehring, 2000|
|Italy||Localised||Introduced||Mizzan and Zanella, 1996; Galil et al., 2002|
|Netherlands||Widespread||Introduced||Maitland, 1874||First report in 1984 from the Zuiderzee now Ijsselmeer (last specimen found in 1943 after closure of Zuiderzee) now very scarce in dutch waters (Christiansen, 1969)|
|Poland||Localised||Introduced||Demel, 1953; Turoboyski, 1973; Normant et al., 2004|
|Portugal||Localised||Introduced||Gonçalves et al., 1995||First reported in 1991 from the Estuary of the Mondego river (patchy distribution)|
|Romania||Present||Introduced||Bacescu, 1967||First reported in 1951 in the Black Sea (Razelm lagoon)|
|Russian Federation||Present||Present based on regional distribution.|
|-Southern Russia||Present||Introduced||Gadzhiev, 1963; Marchand and Saudray, 1971; Zaitsev and Öztürk, 2001|
|Spain||Present, few occurrences||Introduced||Mariscal et al., 1991||First report in May of 1990 in Guadalquivir swamp (25 males, 3 females - considered established population)|
|UK||Localised||Introduced||Eno et al., 1997||First reported in 1996. Found in Roath Docks, Cardiff, South Wales. Established throughout Cardiff Docks in water at 12 ppt|
|Ukraine||Present||Introduced||Makarov, 1939; Zaitsev and Öztürk, 2001|
History of Introduction and SpreadTop of page
In the United States, R. harrisii invaded San Francisco Bay between the late 1800s and the early 1900s, likely via translocations of the Atlantic oyster, Crassostrea virginica, from Chesapeake Bay in an attempt to initiate commercial oyster aquaculture (Cohen and Carlton, 1995; Ruiz et al., 1997; Wasson et al., 2001). Since then, R. harrisii has expanded its range northwards along the coast of California and Oregon, reaching several bays and estuaries where populations persist (Petersen, 2006). Interestingly, on the Atlantic Coast, the crab appears to have expanded its native range inland, successfully invading freshwater impoundments in Texas, where it has established reproducing populations (Howells, 2001; Keith, 2008).
IntroductionsTop of page
|Introduced to||Introduced from||Year||Reason||Introduced by||Established in wild through||References||Notes|
|Natural reproduction||Continuous restocking|
|California||USA||1937||Yes||Cohen and Carlton (1995); Jones (1940); Ruiz et al. (1997); Wasson et al. (2001)||First observed in the Pacific (1937) in Lake Merritt, Oakland, a brackish water lake near a shipping harbour. It invaded San Francisco Bay (late 1800s-early 1900s) presumably via translocations of Atlantic oyster|
|Europe||North America||late 1800s||Yes||Christiansen (1969); Demel (1953); Maitland (1874); Makarov (1939); Marchand and Saudray (1971); Saudray (1956); Schubert (1936); Wolff (1954); Zaitsev and Öztürk (2001)||Maitland (1874) initially described R. harrisii as a native species, Pilumnus tridentatus, in the Netherlands. It was reported from Germany (1936), Ukraine (1932-1936), Russia (1948), Poland (1951), Denmark (1953) and France (1955)|
|Japan||<2000||Yes||Iseda et al. (2007)|
|Oregon||California||early 1900s||Yes||Petersen (2006)||Molecular evidence suggests that current Pacific populations descend from a single introduction event and that the presence of R. harrisii in Oregon resulted from a northward range expansion|
|Panama||1969||Yes||Abele and Kim (1989); Roche et al. (2009)||Five specimens of R. harrisii were collected in the Panama Canal in 1969 but the crab was not considered to be established. In 2007 two populations were discovered in the Miraflores Third Lock Lagoons, adjacent to the Panama Canal|
Risk of IntroductionTop of page
To date, R. harrisii has successfully colonized several different habitats ranging from freshwater lakes in Texas, bays and estuaries on the eastern and western Pacific, ports and estuaries in the Mediterranean, in inland Europe and Asia, and also a tropical lagoon system in Panama (reviewed in Roche and Torchin, 2007). At present time, its introduced range spans more than 45° of latitude (Roche et al., 2009) and its tolerance to a wide range of environmental conditions is likely to promote further spread (Turoboyski, 1973; Williams, 1984; Petersen, 2006). Recently, R. harrisii has been identified as one of the top 30 species of concern from a list of 851 marine pests likely to invade Australia (Hayes and Sliwa, 2003). There is also a risk that it may reach New Zealand given its recent occurrence in Japan, the source country of two other decapods introduced to New Zealand (see Brockerhoff and McLay, 2008).
HabitatTop of page
R. harrisii is tolerant to a wide range of salinities and is typically associated with sheltered estuarine habitats (Roche and Torchin, 2007). The crab usually inhabits oyster reefs, woody debris and shoreline vegetation and has previously been recorded at a depth of approximately 37 m (Turoboyski, 1973; Williams, 1984; Petersen, 2006). Although it is a mud crab, R. harrisii will avoid mudflats and areas of the bottom which are muddy but devoid of shelter (Turoboyski, 1973). Turoboyski (1973) points out that, in Poland, the distribution of R. harrisii in the Dead Vistula was markedly limited by the composition of the substrate and the availability of shelters. In its native range, in Chesapeake Bay, Ryan (1956) found the crab between 0 and 10 m depth and between 2.8 and 18.6 ppt salinity. He also noted that R. harrisii was the only species of Xanthidae studied in Chesapeake Bay known to occur in freshwater. Similarly, in the Newport River Estuary, North Carolina, Cronin (1982) found crabs in salinities varying between 0.5 and 25 ppt. Adult crabs have previously been observed to migrate into freshwater (Williams, 1984), but low salinity is believed to be the most important factor limiting the distribution of R. harrisii larvae which typically have reduced survival rates below 5 ppt (Costlow et al., 1966; Christiansen and Costlow, 1975; Cronin, 1982; Gonçalves et al., 1995a). Nonetheless, reproducing populations have recently been found in water bodies with salinities as low as 0.4 ppt (Keith, 2008; Roche et al., 2009).
Habitat ListTop of page
|Inland saline areas||Present, no further details|
|Coastal areas||Principal habitat||Natural|
|Coastal areas||Principal habitat||Productive/non-natural|
|Intertidal zone||Secondary/tolerated habitat||Natural|
|Lakes||Secondary/tolerated habitat||Harmful (pest or invasive)|
|Reservoirs||Secondary/tolerated habitat||Harmful (pest or invasive)|
|Rivers / streams||Present, no further details||Productive/non-natural|
|Inshore marine||Principal habitat||Natural|
|Inshore marine||Principal habitat||Productive/non-natural|
Biology and EcologyTop of page
Water TolerancesTop of page
|Parameter||Minimum Value||Maximum Value||Typical Value||Status||Life Stage||Notes|
|Depth (m b.s.l.)||0||10||Optimum||Found to depth of 36.6 m in its native range (Williams, 1984)|
|Salinity (part per thousand)||10||20||Optimum||0.2-40 tolerated. Lower and upper limits of tolerance differ among studies/populations|
|Water temperature (ºC temperature)||20||25||Optimum||0-35+ tolerated (Christiansen and Costlow, 1975). Lowest temperature tolerance has not been assessed in the lab., but the crab thrives in New Brunswick, where water temperatures are near freezing|
Natural enemiesTop of page
|Natural enemy||Type||Life stages||Specificity||References||Biological control in||Biological control on|
|Ameiurus catus||Predator||Adult||not specific||Williams, 1984|
|Anguilla anguilla||Predator||Adult||not specific||Turoboyski, 1973|
|Loxothylacus panopaei||Parasite||Adult/Larval||to species||Grosholz and Ruiz, 1995|
|Minchinia||Parasite||not specific||Marchand, 1974|
|Myoxocephalus scorpius||Predator||Adult||not specific|
|Platichthys flesus||Predator||Adult||not specific|
|Zoarces viviparus||Predator||Adult||not specific|
Notes on Natural EnemiesTop of page
Several predators have been reported to feed on R. harrisii: the white catfish, Ictalurus catus, in the crab’s native range (Heard, 1975 cited in Williams, 1984); the European eel, Anguilla anguilla, in Poland (Turoboyski, 1973); the flounder Pleuronectes flesus, the sculpin Myoxocephalusscorpius, and the blenny Zoarces viviparus in the Bay of Gdansk in the Baltic Sea (Kujawa, 1965); and sturgeon species in the Caspian Sea (Zaitsev and Öztürk, 2001). R. harrisii’s most important natural enemy, however, is probably the introduced rhizocephalan barnacle, Loxothylacus panopaei.L. panopaei is native to the Gulf of Mexico, but was introduced to Chesapeake Bay around 1969, where it parasitizes R. harrisii (Grosholz and Ruiz, 1995). Female larvae of L. panopaei typically infect recently moulted crabs and develop as an endoparasite; this initial infection is followed by the emergence of an externa (the reproductive body of the parasite) through the abdomen of the crab, which then has to be fertilized by a male L. panopaei larva for the parasite to mature and reproduce (Walker et al., 1992; Alvarez et al., 1995; Glenner et al., 2000). Parasitism by a rhizocephalan results in complete castration and cessation of growth in the host crab (Alvarez et al., 1995). In Chesapeake Bay, R. harrisii is most abundant in areas of the bay where the water is below 10 ppt salinity, conditions which do not allow the survival of L. panopaei (Walker et al., 1992; Grosholz and Ruiz, 1995; Petersen, 2006). Currently, no specimens of R. harrisii have been reported to harbour L. panopei outside of the crab’s native range. However, a protozoan parasite of the genus Minchinia (Haplosporidiidae), which is also present in Chesapeake Bay, has been reported to parasitize an introduced population in the Canal de Caen, France (Marchand, 1974). According to Marchand (1974), infections by the protozoan significantly reduced the abundance of R. harrisii by lowering the competitive ability of parasitized individuals. Lastly, Payen and Bonami (1979) identified particles of a white spot baculovirus in the testicular germinative zone of R. harrisii from North Carolina, but did not examine the effects of the virus on its host or reported introduced populations harbouring the disease.
Means of Movement and DispersalTop of page
Natural Dispersal (Non-Biotic)
Pathway CausesTop of page
|Aquaculture||From Chesapeake Bay (Atlantic USA) to San Francisco Bay (Pacific USA)||Yes||Cohen and Carlton, 1995; Ruiz et al., 1997; Wasson et al., 2001|
|Hitchhiker||On ships from North America to Europe; Panama and Japan||Yes||Christiansen, 1969; Iseda et al., 2007; Roche et al., 2009|
Pathway VectorsTop of page
Impact SummaryTop of page
Economic ImpactTop of page
In Texan impoundments and in the Caspian Sea, where R. harrisii reaches high densities, the crab is reported to cause fouling problems in water intake pipes of shoreline properties and also of nuclear power plants (Glen Rose, Texas) (Zaitsev and Öztürk, 2001; Keith, 2008). In the Caspian Sea, R. harrisii is reported to cause economic losses to fishermen by spoiling fishes in gill nets (Zaitsev and Öztürk, 2001).
Environmental ImpactTop of page
Impact on Habitats
At the present time, no studies have quantified the impacts of R. harrisii on the communities where it has been introduced. However, anecdotal evidence suggests that the crab may alter species interactions and cause some economic damage (reviewed in Roche and Torchin, 2007).
Impact on Biodiversity
In Europe and on the West Coast of North America, R. harrisii is said tocompete with native crabs (Marchand and Saudray, 1971; Jazdzewski and Konopacka, 1993; Cohen and Carlton, 1995) as well as with species of fish feeding on benthos (Zaitsev and Öztürk 2001) and can alter food webs by acting as a predator and serving as prey of native species (Turoboyski, 1973; Cohen and Carlton, 1995; Zaitsev and Öztürk, 2001). In Texas, R. harrisii’s presence in inland impoundments may have displaced a native species of freshwater crayfish (Keith, 2008). According to Payen and Bonami (1979), R. harrisii can also be a potential host of white spot baculoviruses, which can be transmitted to co-occurring native crustaceans.
Risk and Impact FactorsTop of page Invasiveness
- Proved invasive outside its native range
- Has a broad native range
- Abundant in its native range
- Highly adaptable to different environments
- Is a habitat generalist
- Pioneering in disturbed areas
- Capable of securing and ingesting a wide range of food
- Fast growing
- Has high reproductive potential
- Has high genetic variability
- Altered trophic level
- Infrastructure damage
- Negatively impacts livelihoods
- Competition - monopolizing resources
- Pest and disease transmission
- Highly likely to be transported internationally accidentally
- Difficult to identify/detect as a commodity contaminant
- Difficult to identify/detect in the field
- Difficult/costly to control
UsesTop of page
In its native range, R. harrisii has been used repeatedly as an experimental animal in developmental and physiological studies as well as in experimental studies testing the effects of pesticides on aquatic invertebrate fauna. Williams (1984) lists a number of these studies with accompanying references: Jones (1941) and Capen (1972), osmoregulation; Christiansen et al. (1977a,b), effects of hormone mimics on development; (Costlow, 1966), effect of eyestalk removal on development; Costlow and Sastry (1966), free amino acids in development stages; Forward (1976), shadow-sinking response of larvae; Gooch (1977) and Morgan et al. (1978), allozyme genetics; Kalber and Costlow (1966; 1968), ontogeny of osmoregulation and its neurosecretory control; Rosenberg and Costlow (1976), effects of cadmium on development. Other studies not listed by Williams (1984) include: Payen and Costlow (1977) effects of a juvenile hormone mimic on gametogenesis; Christiansen (1978) and Christiansen and Costlow (1980; 1982), effects of the insect growth regulator Dimilin on adults and larvae; Clare et al. (1992), developmental toxicity of four pesticides; Celestial et al. (1994), effects of an insect growth regulator (S-methoprene) on larval development; Nates and McKenney (2000), effects of the insect juvenile hormone analogue fenoxycarb on larval growth; Cripe et al. (2003) effects of fenoxycarb exposure on larval development; McKenney (2005), effects of juvenile hormone agonists (pyriproxyfen, methoprene and fenoxycarb) on metamorphosis and reproduction.
DiagnosisTop of page
R. harrisii can easily be mistaken for other species of xanthid crabs and even crabs from other closely related families. For instance, in the eastern USA, Petersen (2006) states that similarities in the general morphology of R. harrisii and the co-occurring indigenous shore crab Hemigrapsus oregonensis would make it difficult for non-specialists to distinguish both species (see Figure 1 in Petersen, 2006).
Similarities to Other Species/ConditionsTop of page
R. harrisii is a small and cryptic crab which can easily be mistaken for many other brackish and marine xanthids (e.g. Panopeus cf miraflorensis in Panama, Abele and Kim, 1989; Pilumnopeus makianus in Japan, Iseda et al., 2007). Features which can be used to distinguish R. harrisii from other xanthid crabs are the following: chelae white at the tip, slight notch on the frontal margin, margin transversally grooved, moderately developed basal tooth on dactyl of the major chela, red spot absent on inner surface of third maxilliped.
Prevention and ControlTop of page
As dispersal via hull fouling of ships is believed to have decreased with the advent of metallic hulls and antifouling paints (Rodríguez and Suárez, 2001), the major current vector of introduction for R. harrisii is likely to be transport in ballast water tanks (Brockerhoff and McLay, 2008). Therefore, reducing the discharge of overseas ballast water from ships is potentially an effective method of decreasing the risk of invasion by R. harrisii. In the Great Lakes, the USA and Canada have implemented regulations for mid-ocean ballast exchanges to reduce propagule pressure at ports of arrival (Costello et al., 2007). Although some authors question the effectiveness of ballast water exchanges due to continued discoveries of introduced species in the Great Lakes, Costello et al. (2007) argue that several more years of data collection will be required to draw conclusions about the effectiveness of this prevention method as recent detections are likely to result from a lag between introduction and detection. Other countries such as Australia and New Zealand have also implemented mandatory ballast water exchanges following the guidelines of the International Convention on the Control and Management of Ship’s Ballast Water and Sediments - BWM (Hewitt and Campbell, 2007). This convention was adopted by the International Maritime Organization in 2004 but the date of entry into force has yet to be determined (BWM, 2005).
Gaps in Knowledge/Research NeedsTop of page
Much research has been conducted on R. harrisii in its native and introduced ranges, which has contributed to our knowledge of its biology and ecology. However, little is currently known about the crab’s impacts in its introduced range, aside from anecdotal reports, and quantitative studies are urgently needed to evaluate the potential damages caused by this increasingly widespread invader. Furthermore, means of controlling or eradicating the crab have been suggested, but they remain to be tested in order to establish protocols for managing invasions of R. harrisii when they occur.
ReferencesTop of page
Alvarez F; Hines AH; Reaka-Kudla ML, 1995. The effects of parasitism by the barnacle Loxothylacus panopaei (Gissler) (Cirripedia: Rhizocephala) on growth and survival of the host crab Rhithropanopeus harrisii (Gould) (Brachyura: Xanthidae). Journal of Experimental Marine Biology and Ecology, 192(2):221-232.
Ben Souissi JI; Zaouali J; Rezig M; Neimeddine Bradai M; Quignard JP; Rudman B, 2004. [English title not available]. (Contribution á l'étude de quelques récentes migrations d'espèces exotiques dans les eaux Tunisiennes.) Rapports de la Commission Internationale pour l'Exploration Scientifique de la Mer Méditerranée, 37:312.
Brockerhoff AM; McLay CL, 2008. No frontiers in the sea for marine invaders and their parasites? No frontiers in the sea for marine invaders and their parasites., New Zealand: New Zealand Ministry of Agriculture and Forestry, 111 pp. [Biosecurity New Zealand Technical Paper No: 2008/10.] http://www.maf.govt.nz/mafnet/publications/biosecurity-technical-papers/2008-10-marine-invaders-and-parasites.pdf
BWM, 2005. International convention on the control and management of ship's ballast water and sediments. International convention on the control and management of ship's ballast water and sediments. International Maritime Organization, unpaginated. http://www.imo.org
Christiansen ME; Costlow JD, 1975. Effect of salinity and cyclic temperature on larval development of mud-crab Rhithropanopeus-Harrisii (Brachiura, Xanthidae) reared in laboratory. Marine Biology, 32(3):215-221.
Christiansen ME; Costlow JD, 1980. Persistence of the insect growth regulator Dimilin in brackish water: a laboratory evaluation using larvae of an estuarine crab as indicator. Helgoländer Meeresuntersuchungen, 33:327-332.
Christiansen ME; Costlow JD, 1982. Ultrastructural study of the exoskeleton of the estuarine crab Rhithropanopeus harrisii: effect of the insect growth regulator Dimilin (diflubenzuron) on the formation of the larval cuticle. Marine Biology, 66(3):217-226.
Cohen AN, 2006. Chapter III - species introductions and the Panama Canal. In: Bridging divides - maritime canals as invasion corridors [ed. by Gollasch, S.\Galil, B. S.\Cohen, A. N.]. Berlin: Springer, 127-206.
Cohen AN; Carlton JT, 1995. Nonindigenous aquatic species in a U.S. estuary: a case study of the biological invasions of the San Francisco Bay and delta. A report for the US fish and wildlife service, Washington D.C. unpaginated.
Costello C; Drake JM; Lodge DM, 2007. Evaluating an invasive species policy: ballast water exchange in the Great Lakes. Ecological Applications, 17(3):655-662. http://www.esajournals.org/perlserv/?request=get-document&doi=10.1890%2F06-0190
Costlow JD; Bookhout CG; Monroe RJ, 1966. Studies on the larval development of the crab Rhithropanopeus harrisii (Gould). 1. Effect of salinity and temperature on larval development. Physiological Zoölogy, 39(2):81-100.
Costlow JD; Bookout CG, 1971. The effect of cyclic temperature on larval development in the mud crab Rhithropanopeus harrisii. In: Proceedings of the 4th European Marine Biology Symposium [ed. by Crisp, D. J.]. Cambridge, UK: Cambridge University Press, 211-220.
Cripe GM; McKenney CL Jr; Hoglund MD; Harris PS, 2003. Effects of fenoxycarb exposure on complete larval development of the xanthid crab, Rhithropanopeus harrisii. Environmental Pollution, 125(2):295-299.
Delaney DG; Sperling CD; Adams CS; Leung B, 2008. Marine invasive species: validation of citizen science and implications for national monitoring networks. Biological Invasions, 10(1):117-128. http://www.springerlink.com/link.asp?id=103794
FICMNEW - Federal Interagency Committee for the Management of Noxious and Exotic Weeds, 2003. A national early detection and rapid response system for invasive plants in the United States. A national early detection and rapid response system for invasive plants in the United States. 27 pp. http://www.fws.gov/ficmnew/FICMNEW_EDRR_FINAL.pdf
Glenner H; Høeg JT; O'Brien JJ; Sherman TD, 2000. Invasive vermigon stage in the parasitic barnacles Loxothylacus texanus and L. panopaei (Sacculinidae): closing of the rhizocephalan life-cycle. Marine Biology, 136(2):249-257.
Goddard JHR; Torchin ME; Kuris AM; Lafferty KD, 2005. Host specificity of Sacculina carcini, a potential biological control agent of the introduced European green crab Carcinus maenas in California. Biological Invasions, 7(6):895-912. http://www.springerlink.com/content/l843p846456243u0/fulltext.pdf
Gonçalves F; Ribeiro R; Soares AMVM, 1995. Laboratory study of effects of temperature and salinity on survival and larval development of a population of Rhithropanopeus harrisii from the Mondego River Estuary, Portugal. Marine Biology, 121(4):639-645.
Grosholz ED; Ruiz GM, 1995. Does spatial heterogeneity and genetic variation in populations of the xanthid crab Rhithropanopeus harrisii (Gould) influence the prevalence of an introduced parasitic castrator? Journal of Experimental Marine Biology and Ecology, 187(1):129-145.
Hein CL; Roth BM; Ives AR; Zanden MJvander, 2006. Fish predation and trapping for rusty crayfish (Orconectes rusticus) control: a whole-lake experiment. Canadian Journal of Fisheries and Aquatic Sciences, 63(2):383-393.
Hein CL; Zanden MJvander; Magnuson JJ, 2007. Intensive trapping and increased fish predation cause massive population decline of an invasive crayfish. Freshwater Biology, 52(6):1134-1146. http://www.blackwell-synergy.com/loi/fwb
Hewitt CL; Campbell ML, 2007. Mechanisms for the prevention of marine bioinvasions for better biosecurity. Marine Pollution Bulletin, 55(7/9):395-401. http://www.sciencedirect.com/science/journal/0025326X
Hewitt CL; Martin RB, 2001. Revised protocols for baseline port surveys for introduced marine species: survey design, sampling protocols and specimen handling. Revised protocols for baseline port surveys for introduced marine species: survey design, sampling protocols and specimen handling. Hobart, Tasmania: CSIRO Marine Research, 46 pp. [Technical Report No. 22.] http://www.marine.csiro.au/crimp/reports/CRIMPTechReport22.pdf
Howells R, 2001. Introduced non-native fishes and shellfishes in Texas waters: an updated list and discussion. Introduced non-native fishes and shellfishes in Texas waters: an updated list and discussion. unpaginated. [Texas Parks and Wildlife Department, Management Data Series No. 188.]
Keith DE, 2008. Occurrence of Rhithropanopeus harrisii (mud crab) in Texas inland impoundments. Occurrence of Rhithropanopeus harrisii (mud crab) in Texas inland impoundments. Tarleton State University, unpaginated. http://www.tarleton.edu/~biology/dekeith.html
Kinne O; Rotthauwe HW, 1952. [English title not available]. (Biologische Beobachtungen und Untersuschungen über die Blutkonzentration an Heteropanope tridentatus Maitland (Dekapoda).) Kieler Meeresforsch, 8:212-217.
Laughlin RB; French W, 1989. Differences in responses to factorial combinations of temperature and salinity by zoeae from two geographically isolated populations of the mud crab Rhithropanopeus harrisii. Marine Biology, 102(3):387-395.
Marchand J, 1972. [English title not available]. (Bionomie benthique de l'estuaire de la Loire 1. Observations sur l'estran maritime de la mer á Cordemais.) Revue des Travaux de l'Institut des Pêches Maritimes, 36(1):47-67.
Marchand J, 1974. [English title not available]. (Présence de Michinia sp. (Haplosporida - Haplosporidiiae) chez le xanthide Rhithropanopeus harrisii (Gould) tridentatus (Maitland) dans le Canal de Caen á la Mer.) Revue des Travaux de l'Institut des Pêches Maritimes, 38(2):209-213.
Marchand J, 1979. [English title not available]. (Observations sur des populations naturelles de Rhithropanopeus harrisii tridentatus dans l'estuaire de la Loire: Fréquence des mues et taux de croissance des femelles adultes.) Cahiers de biologie marine, 20:461-469.
Marchand J; Saudray Y, 1971. [English title not available]. (Rhithropanopeus harrisii Gould tridentatus Maitland (Crustacé - Décapode - Brachyoure), dans le réseau hydrographique de l'ouest de l'Europe en 1971.) Bulletin de la Société Linnéenne de Normandie, 102:105-113.
Mariscal JAC; Garcia-Raso JE; Gonzilez Gordillo JI, 1991. [English title not available]. (Primera cita de Rhithropanopeus harrisii (Gould, 1841) (Crustacea, Decapoda, Brachyura, Xanthidae) en la Peninsula Iberica.) Boletin del Instituto Espanol Oceanografia, 7:149-153.
Mizzan L; Zanella L, 1996. First record of Rhithropanopeus harrisii (Gould, 1841) (Crustacea, Decapoda, Xanthidae) in the Italian waters. Bolletino del Museo civico di Storio Naturale di Venezia, 46:109-120.
Morgan SG; Goy JW; Costlow JD, 1988. Effect of density, sex-ratio, and refractory period on spawning of the mud crab Rhithropanopeus harrisii in the laboratory. Journal of Crustacean Biology, 8(2):245-249.
Murina WW; Rieznichenko OG, 1960. [English title not available]. (Ob autoaklimatizatsi kraba Rhithropanopeus harrisii tridentatus (Maitland) v Vislinskom Zalivye.) Trudy vses. gidrobiol. Obsheh, 10:255-264.
Nates SF; McKenney CL, 2000. Growth, lipid class and fatty acid composition in juvenile mud crabs (Rhithropanopeus harrisii) following larval exposure to Fenoxycarb (R), insect juvenile hormone analog. Comparative Biochemistry and Physiology C-Toxicology & Pharmacology, 127(3):317-325.
Nehring S, 2000. [English title not available]. (Zur Bestandssituation von Rhithropanopeus harrisii (Gould, 1841) in deutschen Gewässern: Die sukzessive Ausbreitung eines amerikanischen Neozoons (Crustacea: Decapoda: Panopeidae).) Senckenbergiana maritime, 30:115-122.
NISC - National Invasive Species Council, 2003. General guidelines for the establishment and evaluation of invasive species early detection and rapid response systems, Version 1. General guidelines for the establishment and evaluation of invasive species early detection and rapid response systems, Version 1. 16 pp. http://invasivespecies.nbii.gov/documents/inv_NISCEDRRGuidelineCommunication.pdf
Noël P, 2001. [English title not available]. (Le crabe américain Rhithropanopeus harrisii étend-t-il actuellement son aire de distribution en Méditerranée?.) Rapports de la Commission Internationale pour l'Exploration Scientifique de la Mer Méditerranée, 36:407.
Normant M; Miernik J; Szaniawska A, 2004. Remarks on the morphology and the life cycle of Rhithropanopeus harrisii ssp tridentatus (Maitland) from the Dead Vistula River. Oceanological and Hydrobiological Studies, 33(4):93-102.
Payen GG; Bonami JR, 1979. [English title not available]. (Mise en évidence de particules d'allure virale associées aux noyaux des cellules mésodermiques de la zone germinative testiculaire du crabe Rhithropanopeus harrisii (Gould)(Brachyura, Xanthidae).) Revue des Travaux de l'Institut des Pêches Maritimes, 43:361-365.
Pederson J; Bullock R; Carlton J; Dijkstra J; Dobroski N; Dyrynda P; Fisher R; Harris L; Hobbs N; Lambert G; Lazo-Wasem E; Mathieson A; Miglietta M-P; Smith J; Smith JIII; Tyrell M, 2003. Marine Invaders in the Northeast: Rapid assessment survey of non-native and native marine species of floating dock communities. Report for the Massachusetts Institute of Technology Sea Grant Program.
Petersen C, 2006. Range expansion in the Northeast Pacific by an estuary mud crab - a molecular study. Biological Invasions, 8(4):565-576. http://www.springerlink.com/content/f1p5106rj7l15n6t/?p=c42816e73ac6468db314da672538f21b&pi=1
Roche DG; Torchin ME, 2007. Established population of the North American Harris mud crab, Rhithropanopeus harrisii (Gould 1841) (Crustacea: Brachyura: Xanthidae) in the Panama Canal. Aquatic Invasions, 2(3):155-161. http://www.aquaticinvasions.ru/2007/AI_2007_2_3_Roche_Torchin.pdf
Roche DG; Torchin ME; Leung B; Binning SA, 2009. Localized invasion of the North American Harris mud crab, Rhithropanopeus harrisii, in the Panamà Canal: implications for eradication and spread. Biological Invasions, 11(4):983-993. http://www.springerlink.com/content/55p58147r12t575q/?p=7e4db05d2d5e4bf1a6e1eebc2e38ce54&pi=18
Saudray Y, 1956. [English title not available]. (Présence de Heteropanope tridentatus Maitl. Crustacé brachyoure dans le réseau hydrographique normand.) Bulletin de la Société Zoologique de France, 81:33-35.
Walker G; Clare AS; Rittschof D; Mensching D, 1992. Aspects of the life-cycle of Loxothylacus panopaei (Gissler) a sacculinid parasite of the mud crab Rhithropanopeus harrisii (Gould): a laboratory study. Journal of Experimental Marine Biology and Ecology, 157(2):181-193.
Wasson K; Zabin JC; Bedinger L; Diaz MC; Pearse JS, 2001. Biological invasions of estuaries without international shipping: the importance of intraregional transport. Biological Conservation, 102:143-153.
OrganizationsTop of page
Europe: DAISIE - Delivering Alien Invasive Species Inventories for Europe, Web-based service, http://www.europe-aliens.org
UK: Joint Nature Conservation Committee (JNCC), Monkstone House, City Road, Peterborough, PE1 1JY, http://www.jncc.gov.uk/
Canada: Sealifebase, Web based, www.sealifebase.org
New Zealand: World Register of Marine Speces (WoRMS), email@example.com, http://www.marinespecies.org/
ContributorsTop of page
25/05/09 Original text by:
Dominique Roche, McGill University - STRI, Department of Biology, Canada
Distribution MapsTop of page
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