AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
Species |
Craspedacusta sowerbii [WoRMS] Comments: The species name is often mistyped as sowerbyi, sowerbi, sowerby! |
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Authority | Lankester, 1880 | |
Family | Olindiidae | |
Order | Limnomedusae | |
Class | Hydrozoa | |
Phylum | Cnidaria | |
Synonym (?) | ||
Sub-species level (?) | Not entered |
Native origin (?) | Country: China References (not structured): Marchessaux, G., Bejean, M. 2020. From frustules to medusae: A new culture system for the study of the invasive hydrozoan Craspedacusta sowerbii in the laboratory. Invertebrate biology, 139(4), e12308. Comments: East Asia (YangziJiang River) |
Life form / Life stage (?) |
References (not structured): Acker, T. S., Muscat, A. M. 1976. The ecology of Craspedacusta sowerbii Lankester, a freshwater hydrozoan. American Midland Naturalist, pp. 323-336. Comments: Under stress, such as cold or starvation, the polyps can shrink to a resting body - a ball of cells. |
Sociability / Life stage (?) |
References (not structured): Siquier, M. F., Alanis, W. S., Debat, C. M. 2017. First record of Craspedacusta sowerbii Lankester, 1880 (Hydrozoa, Limnomedusae) in a natural freshwater lagoon of Uruguay, with notes on polyp stage in captivity. Brazilian Journal of Biology, 77(4), pp. 665-672. Comments: The hydroids of C. sowerbii are solitary or occur in small joined clusters of up to 12 polyps, which are linked by a short stolon. |
Reproductive frequency (?) | Iteroparous |
Reproductive type (?) | Asexual Sexual References: Arbačiauskas, K., Lesutienė, J. 2005. The freshwater jellyfish (Craspedacusta sowerbii) in Lithuanian waters. Acta Zoologica Lituanica, 15(1), pp. 54-57. Comments: Craspedacusta sowerbyi reproduce asexually in the polyp form, via budding. They can form three different types of buds: polyps, frustules, or medusa buds. The polyp bud grows and develops while still attached to the original polyp. The frustule bud develops into a frustule; they are only able to travel a short distance before developing into a new polyp. The medusa bud detaches to form a free-living adult medusa, which reproduces sexually via fertilized eggs, which develop into planula larva. Sexual reproduction is relatively rare in this form of jellyfish. Most populations are strictly male or female. |
Developmental trait (?) | Spawning References: Acker, T. S., Muscat, A. M. 1976. The ecology of Craspedacusta sowerbii Lankester, a freshwater hydrozoan. American Midland Naturalist, pp. 323-336. |
Characteristic feeding method / Life stage (?) |
References (not structured): Pérez-Bote, J. L., Muñoz, A., Morán, R., Roso, R., Romero, A. J. 2006. First record of Craspedacusta sowerbyi Lankester, 1880 (Cnidaria: Limnomedusae: Olindiidae) in the Proserpina Reservoir (Extremadura, SW Spain) with notes on their feeding habits. Belgian Journal of Zoology, 136(2), 163. Comments: Craspedacusta feeds on a variety of zooplankton, but common crustaceans such as Bosmina, Ceriodaphnia, Eudiaptomus and Mesocyclops. |
Mobility / Life stage (?) |
References (not structured): Pérez-Bote, J. L., Muñoz, A., Morán, R., Roso, R., Romero, A. J. 2006. First record of Craspedacusta sowerbyi Lankester, 1880 (Cnidaria: Limnomedusae: Olindiidae) in the Proserpina Reservoir (Extremadura, SW Spain) with notes on their feeding habits. Belgian Journal of Zoology, 136(2), 163. Peterson, M., Tan, K. C., Collins, A., Kitano, S., Kusuoka, Y., Suzuki, T. G., ... Ames, C. L. 2022. A description of a novel swimming behavior in a dioecious population of Craspedacusta sowerbii, the rediscovery of the elusive Astrohydra japonica and the first genetic analysis of freshwater jellyfish in Japan. Plankton and Benthos Research, 17, pp. 231-248. Comments: C. sowerbyi produce free-swimming medusae, which bud off from the side of the polype. The active medusa stage of cnidarians is the sexually reproducing stage. The hydroids of C. sowerbii grow on rocks, sticks and vegetation. |
Salinity tolerance range (?) | Exact range: 0 - 3 References: Smithsonian Environmental Research Center. 2024. Craspedacusta sowerbyi. Available at: https://invasions.si.edu/nemesis/species_summary/50776 (Accessed: 11 July 2024) Comments: Craspedacusta sowerbii is the only hydrozoan that both widely occurs in freshwater around the world and possesses a conspicuous medusa stage. Medusae can survive for a while at salinities as high as 3 psu, but shrink markedly above 1.2 psu. |
Habitat modifying ability potential (?) | Unknown |
Toxicity / Life stage (?) |
Comments: Uses its nematocysts located on tentacles to sting and paralyze prey before scooping it into its mouth. |
Bioaccumulation association (?) | Unknown |
Known human health impact? | Known References: McKercher, E., O; Connell, D., Fuller, P., Liebig, J., Larson, J., Makled, T.H., Fusaro, A., and Daniel, W.M., 2024, Craspedacusta sowerbii Lankester, 1880: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, and NOAA Great Lakes Aquatic Nonindigenous Species Information System, Ann Arbor, MI, https://nas.er.usgs.gov/queries/GreatLakes/FactSheet.aspx?Species_ID=1068, Revision Date: 2/20/2024, Access Date: 7/11/2024 Comments: Craspedacusta sowerbyi possess cnidocytes with nematocysts, otherwise known as stinging cells. Unlike some other jellyfish, the nematocysts of freshwater jellyfish are unable to penetrate human skin. Therefore, freshwater jellyfish are unable to produce the painful sting caused by most marine jellyfish. |
Known economic impact? | Not known Comments: There are no reported ecological and economic impacts of C. sowerbii. |
Known measurable environmental impact? | Known References: Jankowski, T. 2000. Chemical composition and biomass parameters of a population of Craspedacusta sowerbii Lank1880 (Cnidaria: Limnomedusa). Journal of plankton research, 22(7), pp. 1329-1340. Comments: Freshwater medusae have only a low impact on plankton communities. |
Included in the Target Species list? | No References: HELCOM, 2009. Alien Species and Ballast Water [PDF]. Available at: (https://archive.iwlearn.net/helcom.fi/stc/files/shipping/Table_2_Alienspecies_%20lists_2009.pdf) |
Association with vessel vectors (?) | Unknown References: Minchin, D., Caffrey, J. M., Haberlin, D., Germaine, D., Walsh, C., Boelens, R., Doyle, T. K. 2016. First observations of the freshwater jellyfish Craspedacusta sowerbii Lankester, 1880 in Ireland coincides with unusually high water temperatures. BioInvasions Records,5(2),pp. 67-74. Comments: C. sowerbii spreads rapidly, probably by many human vectors, including freshwater boating and shipping, stocking of fishes, machinery and tools used in freshwater, aquatic plants, and probably dispersal by birds. s. Transmission in ships’ ballast water may be possible, as resting stages of some other biota are considered to have been transmitted in this way. |
Created by | Stephan Gollasch, 2013-08-17 |
Last update by | Sandra Gečaitė, 2024-07-11 |