Non-native parasitic copepod Neoergasilus japonicus (Harada, 1930) utilizes non-native fish host Lepomis gibbosus (L.) in the floodplain of the River Dyje (Danube basin)
The parasitic copepod Neoergasilus japonicus (Harada, 1930) (Ergasilidae), native to east Asia, is widely distributed in Asia, Europe, and North and Central America. Recently, this species appeared in lentic water bodies of the River Dyje floodplain (Danube basin, Czech Republic). It was first recorded in 2015 and in 2 years it reached a 100% prevalence in recently expanding non-native fish host, Lepomis gibbosus (Linnaeus, 1758) (Centrarchidae, native to North America) at two borrow pits. Abundance of N. japonicus increased with fish length, with maximum intensity of infection reaching 99 parasites per fish. The parasite was most frequently found attached to the dorsal and anal fins of fish, while preference for the dorsal fin was more evident with lower infection intensities. Utilization of expanding fish hosts in water bodies that are regularly interconnected via natural or managed flooding may support the rapid dispersal of this non-native parasite.
KeywordsNeoergasilus Copepod Lepomis Species introductions Centrarchidae 18S, 28S rDNA
We would like to thank Dr. Seth White for proofreading the English text.
This study received financial support through the European Centre of Ichthyoparasitology under the Grant Agency of the Czech Republic—Centre of Excellence Grant No. P505/12/G112.
Compliance with ethical standards
Ethical note statement
The research was undertaken in line with the ethical requirements of the Czech Republic, and has been approved by an appropriate ethics committee. The sampling, transportation, maintenance, and care of experimental fish, as well as method of fish killing complied with legal requirements in the Czech Republic (§7, Law No. 114/1992 about the protection of nature and landscape and § 6, 7, 9, and 10 regulation No. 419/2012 about the care, breeding, and using experimental animals). Researchers involved in this study (MO and PJ) are certified according to Czech legal requirements (§15, Law No. 246/1992 on Animal Welfare) to work with experimental animals.
Conflict of interest
The authors declare that they have no conflict of interest.
- Ergens R, Gussev VA, Izumova NA, Molnár K (1975) Parasite fauna of fishes of the Tisa river basin. Rozpravy ČSAV, Academia, Prague, 85, No. 2, 117 p. (in Czech)Google Scholar
- Gusev AV, Dubinina MN, Raikova EV, Khotenkovskiy IA, Pugachev ON, Ergens R (1985) Paraziticheskiye mnogokletochnye. Part 1. Monogenea. In: Bauer ON (ed) Opredelitel parazitov presnovodnykh ryb fauny SSSR, vol 2. Nauka, Leningrad, pp 1–425 (in Russian)Google Scholar
- Hanek J (1968) The finding of Neoergasilus japonicus (Harada, 1930) (Copepoda: Ergasilidae) in Europe. Folia Parasitol 15:227–228Google Scholar
- Kadlec D, Šimková A, Jarkovský J, Gelnar M (2003) Parasite communities of freshwater fish under flood conditions. Parasitol Res 89:272–283Google Scholar
- Knopf K, Hölker F (2005) First report of Philometra obturans (Nematoda) and Neoergasilus japonicus (Copepoda) in Germany. Acta Parasitol 50:261–262Google Scholar
- Lescher-Moutoué F (1979) Présence en France du Copépode Ergasilidae Neoergasilus japonicus (Harada, 1930): Crustaceana 37:109–112Google Scholar
- Lusk S, Lusková V, Hanel L (2011) Black list of the alien invasive species in the Czech Republic. In: Lusk S, Lusková V (eds) Biodiversity of fishes of the Czech Republic (VIII). IVB ASCR, Brno, pp 79–97. (in Czech)Google Scholar
- Moravec F (2001) Checklist of the metazoan parasites of fishes of the Czech Republic and the Slovak Republic. Academia, Prague, p 169Google Scholar
- Nagasawa K, Sato H (2015) Neoergasilus japonicus (Copepoda: Ergasilidae) parasitic on two alien freshwater fishes (Lepomis macrochirus and Micropterus salmoides) in central Japan, with its new record from Gunma prefecture. Bull Gunma Mus Natu Hist 19:1–4Google Scholar
- Nagasawa K, Uyeno D (2012) Utilization of alien freshwater fishes by the parasitic copepod Neoergasilus japonicus (Ergasilidae) on Okinawa-jima Island, Japan, with a list of the known hosts. Zoosymposia 8:82–97Google Scholar
- Pónyi J, Molnár K (1969) Studies on the parasite fauna of fish in Hungary. V. Parasitic copepods. Parasitol Hung 2:137–148Google Scholar
- Simberloff D, Von Holle B (1999) Positive interactions of non-indigenous species: invasional meltdown? Biol Inv 1:21–32Google Scholar
- Soylu E, Soylu MP (2012) First record of the non-indigenous parasitic copepod Neoergasilus japonicus (Harada, 1930) in Turkey. Turkish J Zool 36:662–667Google Scholar
- Urawa S, Muroga K, Kashara S (1991) Growth and fecundity of the parasitic copepod Neoergasilus japonicus (Ergasilidae). Bulletin of Plankton Society of Japan (Special volume): 619–625Google Scholar