| Country | Portugal | Ecosystem | Atlantic Ocean |
| Locality | Óbidos Lagoon | Depth | |
| Introduced | Year Intro. | ||
| Life Stage | not specified | unsexed | |
| Quantitative | 7 | Unit | number |
| Semi Quantitative | <100 | Unit | number |
| Qualitative | rare | ||
| Year | 1993 - 1994 | Period | 1975-2000 |
| Date | 01/01/93 - 31/12/94 | Record Type | field sample |
| Record Type | field sample | ||
| Seasonal | no | Method | |
| Remarks | Monthly sampling between January 1993 and December 1994, using a 50-m long beach seine with 1-m height and a mesh size of 10 mm. | ||