Marbled crayfish | |
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Adult marmorkrebs | |
Scientific classification ![]() | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Arthropoda |
Class: | Malacostraca |
Order: | Decapoda |
Suborder: | Pleocyemata |
Family: | Cambaridae |
Genus: | Procambarus |
Species: | P. virginalis
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Binomial name | |
Procambarus virginalis Lyko, 2017[1]
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Countries where the Marmorkrebs has been found in the wild. It has also been found in Belgium, Canada, Denmark, Japan, Madagascar, Taiwan, and China.[2][3] | |
Synonyms | |
Procambarus fallax forma virginalis Martin, Dorn, Kawai, van der Heiden & Scholtz, 2010 |
The marbled crayfish or Marmorkrebs (Procambarus virginalis) is a parthenogenetic crayfish that was discovered in the pet trade in Germany in 1995.[4][5] Marbled crayfish are closely related to the "slough crayfish", Procambarus fallax,[6] which is widely distributed across Florida.[7] No natural populations of marbled crayfish are known. Information provided by one of the original pet traders as to where the marbled crayfish originated was deemed "totally confusing and unreliable".[8] The informal name Marmorkrebs is German for "marbled crayfish".
![](Https://upload.wikimedia.org/wikipedia/commons/thumb/4/40/Marmorkrebs_Lorenz_Seebauer_SingliserSee_Germany.jpg/220px-Marmorkrebs_Lorenz_Seebauer_SingliserSee_Germany.jpg)
Model organism
Marbled crayfish were the first known decapod crustaceans to reproduce by parthenogenesis.[4] All individuals are female, and the offspring are genetically identical to the parent.[5][9] Marbled crayfish are triploid animals[5][10] with 276 chromosomes,[11] which may be the main reason for their parthenogenetic reproduction. It is hypothesized that marbled crayfish originated from an error in meiosis resulting in a diploid gamete, which was then fertilized and created a viable triploid individual in a single generation.[5][12] Marbled crayfish are thus a model for the rapid generation of species.[5] Unlike other parthenogenetic organisms, the marbled crayfish is an extremely young species;[11] all marbled crayfish are clonal descendants of a single specimen from 1988.[13]
Because marbled crayfish are genetically identical, easy to care for,[14] and reproduce at high rates, they are a potential model organism, particularly for studying development.[15] A major drawback, however, is the long generation time (several months) compared to other research organisms.[16]
The marbled crayfish genome was sequenced in 2018, which provides an essential foundation for further research.[12]
Invasive species
![](Https://upload.wikimedia.org/wikipedia/commons/thumb/8/81/Procambarus_virginalis_%2810.11646-zootaxa.4363.4.6%29_Figure_2.png/220px-Procambarus_virginalis_%2810.11646-zootaxa.4363.4.6%29_Figure_2.png)
Marbled crayfish have caused concern as a potential invasive species[4] because only a single individual is needed to establish a new population, and they can reproduce at high rates. Marbled crayfish are also a known carrier of a crayfish plague pathogen, Aphanomyces astaci.[17] Marbled crayfish inhabit freshwater environments, and have not successfully invaded ecosystems with higher salinity levels due to their reduced ability to reproduce and grow.[18] However, it has been proven that they can adjust to increasing saline environments, which may allow for their further expansion.[18]
They have since been introduced into natural ecosystems on five continents. They have been found in the wild in the following countries:
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While initial reports of marbled crayfish in the wild in Europe consisted of only single individuals,[27] the number of European countries reporting populations of marbled crayfish is rising.[41]
In Europe, the marbled crayfish is included since 2016 in the list of Invasive Alien Species of Union concern.[42] This implies that this species cannot be imported, bred, transported, commercialized, or intentionally released into the environment in the whole of the European Union.[43]
The Madagascar population has grown rapidly[33][12] and is estimated to be in the millions, with their geographical distribution having increased 100-fold from 2007 to 2017,[11] causing concern among local authorities.[44]
Regulation
Marbled crayfish are one of the most widely distributed species of crayfish in the international pet trade[45][46][47] and release from aquariums has likely been the main source of unwanted introductions. Concerns about the potential damage from their introduction have prompted several jurisdictions to regulate ownership of marbled crayfish.
The European Union instituted "a total ban on the possession, trade, transport, production and release of these species [including the marbled crayfish] in the wild" in 2016.[48][49][50][51]
Japan banned most North American crayfish species, including marbled crayfish, in 2020.[52]
Marbled crayfish are prohibited in the American states of Idaho,[53] Missouri,[54] Tennessee,[55][56] Michigan,[57][58] Maryland,[59] and in the Canadian provinces of Saskatchewan[60] and Ontario.[61]
As food
Marbled crayfish are eaten in Madagascar.[62] Human interest in consuming them may contribute to their spread.[62] Protein isolates from whole-body homogenate (including chitinous exoskeleton) of Procambarus virginalis are hypothesized to be dense in branched-chain amino acids (BCAA) and leucine (Leu). For potential use in biomedical research or as additives in supplements for BCAA and Leu. The mentioned crayfish species could offer 6.36–7.39 g Leu 100 g−1 dry matter (at 43–48% protein only). Crayfish whole-body protein isolates exhibit a Leu coefficient (18.41±2.51% of total amino acids) and a BCAA coefficient (28.76±2.39% of total amino acids), which is comparable to or higher than that of an industrial gold standard such as casein (Leu coefficient 8.65±0.08%; BCAA coefficient 20.03±0.73%).[63]
References
- ^ Lyko, Frank (2017). "The marbled crayfish (Decapoda: Cambaridae) represents an independent new species". Zootaxa. 4363 (4): 544–552. doi:10.11646/zootaxa.4363.4.6. PMID 29245391.
- ^ a b c d e f g h i j k l Pârvulescu, Lucian; Togor, Andrei; Lele, Sandra-Florina; Scheu, Sebastian; Șinca, Daniel; Panteleit, Jörn (2017). "First established population of marbled crayfish Procambarus fallax (Hagen, 1870) f. virginalis (Decapoda, Cambaridae) in Romania" (PDF). BioInvasions Records. 6 (4): 357–362. doi:10.3391/bir.2017.6.4.09. Retrieved 2018-02-09.
- ^ a b D. M. Holdich & M. Pöckl (2007). "Invasive crustaceans in European inland waters". In Francesca Gherardi (ed.). Biological invaders in inland waters: Profiles, distribution, and threats. Invading Nature - Springer Series in Invasion Ecology. Vol. 2. Dordrecht, Netherlands: Springer. pp. 29–75. doi:10.1007/978-1-4020-6029-8_2. ISBN 978-1-4020-6029-8.
- ^ a b c Gerhard Scholtz; Anke Braband; Laura Tolley; André Reimann; Beate Mittmann; Chris Lukhaup; Frank Steuerwald; Günter Vogt (2003). "Parthenogenesis in an outsider crayfish". Nature. 421 (6925): 806. Bibcode:2003Natur.421..806S. doi:10.1038/421806a. PMID 12594502. S2CID 84740187.
- ^ a b c d e Vogt, Günter; Falckenhayn, Cassandra; Schrimpf, Anne; Schmid, Katharina; Hanna, Katharina; Panteleit, Jörn; Helm, Mark; Schulz, Ralf; Lyko, Frank (2015). "The marbled crayfish as a paradigm for saltational speciation by autopolyploidy and parthenogenesis in animals". Biology Open. 4 (11): 1583–1594. doi:10.1242/bio.014241. PMC 4728364. PMID 26519519.
- ^ Peer Martin; Nathan J. Dorn; Tadashi Kawai; Craig van der Heiden; Gerhard Scholtz (2010). "The enigmatic Marmorkrebs (marbled crayfish) is the parthenogenetic form of Procambarus fallax (Hagen, 1870)". Contributions to Zoology. 79 (3): 107–118. doi:10.1163/18759866-07903003. Archived from the original (PDF) on 2011-05-21. Retrieved 2012-02-12.
- ^ Horton H. Hobbs Jr. (1942). "The crayfishes of Florida". University of Florida Publication: Biological Series. 3 (2): 1–179.
- ^ a b Günter Vogt, Laura Tolley & Gerhard Scholtz (2004). "Life stages and reproductive components of the Marmorkrebs (marbled crayfish), the first parthenogenetic decapod crustacean". Journal of Morphology. 261 (3): 286–311. doi:10.1002/jmor.10250. PMID 15281058. S2CID 24702276.
- ^ Peer Martin, Klaus Kohlmann & Gerhard Scholtz (2007). "The parthenogenetic Marmorkrebs (marbled crayfish) produces genetically uniform offspring". Naturwissenschaften. 94 (10): 843–846. Bibcode:2007NW.....94..843M. doi:10.1007/s00114-007-0260-0. PMID 17541537. S2CID 21568188.
- ^ Martin P, Thonagel S, Scholtz G (2015). "The parthenogenetic Marmorkrebs (Malacostraca: Decapoda: Cambaridae) are triploid organisms". Journal of Zoological Systematics and Evolutionary Research. 54: 13–21. doi:10.1111/jzs.12114.
- ^ a b c Gutekunst, Julian; Andriantsoa, Ranja; Falckenhayn, Cassandra; Hanna, Katharina; Stein, Wolfgang; Rasamy, Jeanne; Lyko, Frank (March 2018). "Clonal genome evolution and rapid invasive spread of the marbled crayfish". Nature Ecology & Evolution. 2 (3): 567–573. doi:10.1038/s41559-018-0467-9. ISSN 2397-334X. PMID 29403072.
- ^ a b c Gutekunst, Julian; Andriantsoa, Ranja; Falckenhayn, Cassandra; Hanna, Katharina; Stein, Wolfgang; Rasamy, Jeanne; Lyko, Frank (2018-02-05). "Clonal genome evolution and rapid invasive spread of the marbled crayfish". Nature Ecology & Evolution. 2 (3): 567–573. doi:10.1038/s41559-018-0467-9. ISSN 2397-334X. PMID 29403072.
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- ^ a b Veselý, Lukáš; Hrbek, Vladimír; Kozák, Pavel; Buřič, Miloš; Sousa, Ronaldo; Kouba, Antonín (2017). "Salinity tolerance of marbled crayfish Procambarus fallax f. virginalis". Knowledge & Management of Aquatic Ecosystems (418): 21. doi:10.1051/kmae/2017014. ISSN 1961-9502.
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- ^ "'Capable of cloning': Invasive crayfish found in Burlington pond". Burlington Post. 2023-08-04.
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- ^ Ercoli, F.; Kaldre, K.; Paaver, T.; Gross, R. (2019). "First record of an established marbled crayfish Procambarus virginalis (Lyko, 2017) population in Estonia". BioInvasions Records. 8 (3): 675–683. doi:10.3391/bir.2019.8.3.25.
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{{cite journal}}
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- ^ Roy, Koushik; Das, Koushik; Petraskova, Eva; Kouba, Antonin (2023). "Protein from whole-body crayfish homogenate may be a high supplier of leucine or branched-chain amino acids – A call for validation on genus Procambarus sp". Food Chemistry. 427. doi:10.1016/j.foodchem.2023.136728. PMID 37393634. S2CID 259314365.
External links
- Marmorkrebs.org
- "Procambarus fallax f. virginalis (Marmorkrebs)". Invasive Species Compendium. CAB International.
- Ward, Cassidy (2022-06-11). "Cloned crayfish accidentally created in an aquarium are conquering the world". Yahoo. Retrieved 2022-06-12.