| Country | Japan | Ecosystem | Sea of Japan/East Sea |
| Locality | Tsushima Island | Depth | |
| Introduced | Year Intro. | ||
| Life Stage | adult | unsexed | medusa |
| Quantitative | Unit | ||
| Semi Quantitative | 1000-50000 | Unit | number |
| Qualitative | extremely abundant | ||
| Year | 2002 - 2003 | Period | 2001-present |
| Date | 2002-01-01 00:00:00 - 2003-12-01 00:00:00 | Record Type | observation |
| Record Type | observation | ||
| Seasonal | Method | catch per unit effort | |
| Remarks | First time that over abundance of up to thousands of medusae daily, occurred for two consecutive years. | ||