Japanese mysterysnail, Oriental mysterysnail, Japanese black snail, Japanese trapdoor snail, C. japonicus, C. chinensis japonica, C. chinensis japonicus, Bellamya japonica, B. chinensis japonica, Viviparus japonica, V. japonicus, V. chinensis japonica, Heterogen japonica

Wolfert and Hiltunen (1968) found that the densities and distribution of the species in a waterbody is influenced by prevailing winds.

This species hosts many parasites, some of which affect human health (Michelson 1970; Lin and Chen 1980).

Summary of species impacts derived from literature review. Click on an icon to find out more...

Environmental	Socioeconomic	Beneficial

Current research on the environmental impact of Cipangopaludina japonica in the Great Lakes is inadequate to support proper assessment.

The extent of its role as a parasite host in the Great Lakes is unknown. Negative interactions with native gastropods are considered possible.

Current research on the socio-economic impact of Cipangopaludina japonica in the Great Lakes is inadequate to support proper assessment.

Considered a nuisance by fishermen in Sandusky Bay, Lake Erie. Potential to damage infrastructure by clogging water intakes (U.S. Fish and Wildlife Service, 2018). ;Wolfert and Hiltunen 1968). Cipangopaludina japonica could become a nuisance in other areas where it exists in dense populations (Wolfert and Hiltunen 1968).

There is little or no evidence to support that Cipangopaludina japonica has significan beneficial impacts in the Great Lakes.

While Cipangopaludina japonica has minor commercial value in the aquarium and food trades and may offer some water quality improvements through filter-feeding, these potential benefits are not well-documented or realized within the Great Lakes.

Regulations (pertaining to the Great Lakes region)

• Japanese mystery snail is a regulated invasive species in Minnesota (MN Administrative Rules, 6216.0260 Regulated).
   
• New York lists the Japanese mystery snail (Bellamya japonica) as a prohibited invasive species (6 NYCRR Part 575).
   
• Wisconsin lists Chinese mysterysnail as "restricted” under the state's invasive species rule (Wisconsin Administrative Code, Chapter NR 40). This law is often interpreted to cover the very similar and often confused Japanese mystery snail.
   
• Other Great Lakes states (Michigan, Ohio, Pennsylvania, Illinois, Indiana) do not specifically list C. japonica but have broader laws against the release of non-native species and promote prevention through public education campaigns like "Clean, Drain, Dry."

Note: Check federal, state/provincial, and local regulations for the most up-to-date information.

Control
Specific control methods for the Japanese mystery snail have yet to be developed – most available control suggestions are based on research with the closely related Cipangopaludina chinensis.
 

Biological
Manipulation of predator fishes and turtles that eat snails may be useful in the control of snail populations. However, as a relatively large snail species, Cipangopaludina japonica may escape predation by smaller fishes.
 

Physical

• Current Manipulation: Preliminary research demonstrates that Cipangopaludina chinensis will not migrate upstream against a small current (Rivera 2008). It is not known whether C. japonica is similarly restricted, but the acceleration of current may be an important management tool for preventing upstream spread.
   
• Desiccation (Drying): Desiccation is not likely to be an effective control method for adult Cipangopaludina japonica. Recent studies have confirmed that adults have extremely high desiccation tolerance, with over 50% surviving more than 10 weeks out of water (Lewis et al. 2025). In contrast, juveniles are highly vulnerable, with over 70% mortality occurring within 24 hours of air exposure (Lewis et al. 2025; Rice et al. 2023). Therefore, standard "Clean, Drain, Dry" practices for recreational equipment are likely effective for preventing the spread of juveniles but are insufficient for controlling the transport of adult snails.
   
• Trapping: Funnel traps (e.g., minnow or crayfish traps) may be a useful method for sampling and potentially removing large freshwater snails like C. japonica in certain habitats (Hartzell and Nauman 2024).

Chemical
The molluscicide niclosamide monohydrate has been identified as an effective chemical control agent for C. japonica. A pilot study determined the lethal dose for 50% mortality (LD50) to be 1.296 mg/L after 24 hours of exposure, with individuals not surviving past 11 days during chronic exposure tests (Abeyrathna and Davinack 2023). While other copper compounds are sold as general snailicides, they are often not selective and may cause more damage to native snails than to the target pest, especially given that the operculum of mystery snails can provide some protection against chemical treatments.

Note: Check state/provincial and local regulations for the most up-to-date information regarding permits for control methods. Follow all label instructions.

Heterogen japonica is used by Hirano et al (2019) based on muliple genetic markers.

David and Cote (2019) did a genetic and morphological analysis on North American populations of both C. japonica and C. chinensis, finding them genetically distinct, morphologically indistinguishable, and co-occuring in multiple lakes of New York; the authors go on to discuss literature which also supports the idea that these two species have no shell characters that can be used to distinguish them morphologically.