| Country | Viet Nam | Ecosystem | South China Sea |
| Locality | northern South China Sea | Depth | |
| Introduced | Year Intro. | ||
| Life Stage | adult | mixed | |
| Quantitative | 31 | Unit | number |
| Semi Quantitative | <100 | Unit | number |
| Qualitative | rare | ||
| Year | 1999 - 1999 | Period | 1975-2000 |
| Date | 1999-01-01 00:00:00 - 1999-12-31 00:00:00 | Record Type | survey |
| Record Type | survey | ||
| Seasonal | not specified | Method | |
| Remarks | Census was conducted in 1999, dates are assumed. Population size refers to breeding pairs. | ||