Invasion information |
Range in Japan |
Niigata, Ibaraki, Nagano, Aichi, and Okayama Prefs. This species was established in wider region in past, but have disappeared in many regions, probably due to urbanization and farm area consolidation. |
|
Origin |
Korean Peninsula (around Seoul) |
Date |
Privately imported in 1914. In Kanto District, this species was escaped in 1917. In Okayama Pref., this species was released in 1937. By 1970, released in several regions in Honshu Is. The first record in Kasumigaura Lake, Ibaraki Pref., was in 1930. |
Route |
Deliberate: Escape of pet animal (in Kanto District, 1917); Release for biological control of the parasite Schistosoma japonicum |
Impact |
Unknown impact. |
Regulation in Japan |
No action for prevention, mitigation, control, or eradication. |
Introduced range in other countries |
None. |