AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
Species |
Gyrodactylus salaris [WoRMS] References: Buchmann, K. & Becker, K. 2008. Along go the ride: A parasitic threat to northern European salmon. ICES Insight, 45. 12-15 |
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Authority | Malmberg, 1957 | |
Family | Gyrodactylidae | |
Order | Gyrodactylidea | |
Class | Monogenea | |
Phylum | Platyhelminthes | |
Synonym (?) | ||
Sub-species level (?) | Not entered |
Native origin (?) | LME: 23. Baltic Sea --> LME sub-region: Baltic Sea References (not structured): Buchmann, K. & Becker, K. 2008. Along go the ride: A parasitic threat to northern European salmon. ICES Insight, 45. 12-15 Comments: Native to rivers in Sweden, Finland, Russia, teh Baltic republics, likely also in Poland and Germany. |
Life form / Life stage (?) |
References (not structured): Buchmann, K. & Becker, K. 2008. Along go the ride: A parasitic threat to northern European salmon. ICES Insight, 45. 12-15 |
Sociability / Life stage (?) |
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Reproductive frequency (?) | Iteroparous References (not structured): Buchmann, K. & Becker, K. 2008. Along go the ride: A parasitic threat to northern European salmon. ICES Insight, 45. 12-15 Comments: After 5 to 6 weeks a single fish fry can be covered by >2000 parasites. A fish infected with just a few parasites can be dead within weeks. |
Reproductive type (?) | Asexual Sexual References: Cable, J., P. Harris. 2002. Gyrodactylid Developmental Biology: historical review, current status and future trends. International Journal for Parasitology, 32, pp. 255-280. Comments: Gyrodactylus salaris can reproduce both asexually and sexually. This species tends to lean towards asexual reproduction when the population density is low and sexual reproduction when the population density is high.Gyrodactylus salaris reproduces all year long. Reproduction is reduced in the winter due to a decreased activity of its fish hosts which decrease its transmission and its availability to resources. All newborns are at first female and develop their male genitals later on in life. |
Developmental trait (?) | Viviparous References: Bakke, T. A., Cable, J., Harris, P. D. 2007. The biology of gyrodactylid monogeneans: the “Russian-doll killers”. Advances in parasitology, 64, pp. 161-460. Comments: The parasite is viviparous, that is, it produces live offspring The parasites give birth to live young nearly as big as themselves and at this time, a further generation is already growing inside the neonates. |
Characteristic feeding method / Life stage (?) | Unknown References (not structured): Bakke, T. A., Cable, J., Harris, P. D. 2007. The biology of gyrodactylid monogeneans: the “Russian-doll killers”. Advances in parasitology, 64, pp. 161-460. Comments: Parasite. The adult stage of G. salaris feeds on the host’s skin, mucus, and fins. When they develop in their parent they receive nutrients from their parent as they develop into an adult. |
Mobility / Life stage (?) |
References (not structured): Johnsen, B. 2009).'NOBANIS - Invasive Alien Species Fact Sheet Gyrodactylus salaris', available online: http://www.nobanis.org/files/factsheets/Gyrodactylus_salaris.pdf (Accessed: 2024-07-14). Comments: If G. salaris is not attached to a host, it is not parasitic and floats on the bottom sediment or anywhere in the water column. G. salaris attaches to its host with an opisthaptor, which is an organ in the posterior region. Once born, the parasite functions as an adult attaching to the same host as the parent and produces offspring 24 hours after its birth. |
Salinity tolerance range (?) | Exact range: 0 - 12 References: Buchmann, K., 1997. Salinity tolerance of Gyrodactylus derjavini from rainbow trout Oncorhynchus mykiss. Bulletin of the European Association of Fish Pathologists, (3/4), pp. 123-125. Soleng, A., Bakke, T. A. 1997. Salinity tolerance of Gyrodactylus salaris (Platyhelminthes, Monogenea): laboratory studies. Canadian Journal of Fisheries and Aquatic Sciences, 54(8), pp. 1837-1864. Comments: Gyrodactylus salaris is a cold-water-adapted parasite and mainly lives in freshwater, reproducing normally at salinities up to 5‒6 ppt. At lower temperatures, Gyrodactylus salaris can survive longer in higher salinities. For example at 1.4°C, G. salaris may survive for 240 hours, 78 hours and 42 hours at 10 ppt, 15 ppt and 20 ppt salinity. G. salaris on Atlantic salmon could survive more than 12 ppt seawater during a migration in brackish water between diferent rivers. Also, G. salaris can survive for months in 7.5 ppt. |
Habitat modifying ability potential (?) | Unknown |
Toxicity / Life stage (?) | Not relevant |
Bioaccumulation association (?) | Unknown Comments: Not available. |
Known human health impact? | Known References: EFSA Panel on Animal Health and Welfare (AHAW), Nielsen, S. S., Alvarez, J., Calistri, P., Canali, E., Drewe, J. A., ... Bicout, D. J. 2023. Assessment of listing and categorisation of animal diseases within the framework of the Animal Health Law (Regulation (EU) 2016/429): infection with Gyrodactylus salaris (GS). EFSA Journal, 21(10), e08325. Comments: The parasite is not transmitted to humans or domestic animals, and does not prevent the use of fish for human consumption. |
Known economic impact? | Known References: Riddington, G., Radford, A., Paffrath, S., Bostock, J., Shinn, A. 2006. An Economic Evaluation of the Impact of the Salmon Parasite Gyrodactylus salaris (Gs): Should it be Introduced into Scotland. Comments: Gyrodactylus salaris can affect humans negatively by drastically decreasing the amount of Atlantic salmon. In Norway, it is calculated that they lose around 20 million Euros per year. Therefore, it hurts the economic value of these fisheries as well as depleting available food sources. |
Known measurable environmental impact? | Known References: Johnsen, B. O., Jensen, A. J. 1986. Infestations of Atlantic salmon, Salmo salar, by Gyrodactylus salaris in Norwegian rivers. Journal of Fish Biology, 29(2), pp. 233-241 |
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 (?) | Ballast waters References: Peeler, E. J., Thrush, M. A. 2004. Qualitative analysis of the risk of introducing Gyrodactylus salaris into the United Kingdom. Diseases of Aquatic Organisms, 62(1-2), pp. 103-113. |
Created by | Aleksas Narščius, 2014-01-22 |
Last update by | Sandra Gečaitė, 2024-07-14 |