Genus: Crassostrea
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|---|---|---|---|---|---|
| Agderkysten | Agder, Norway | 1 | 1 | 1 | 2013-03-20 | |
| Agderkysten | Agder, Norway | 1 | 1 | 1 | 2013-03-20 | |
| Arendal | Agder, Norway | 1 | 1 | 0 | 2013-03-20 | |
| Arendal | Agder, Norway | 1 | 1 | 1 | 2013-03-20 | |
| Arendal | Agder, Norway | 1 | 1 | 1 | 2013-03-20 | |
| Bekkevika | Vestfold, Norway | 10 | 1 | 0 | 2014-09-24 | |
| bjellandstrand | Agder, Norway | 1 | 1 | 1 | 2017-09-20 | |
| Bjellanstrand | Agder, Norway | 1 | 1 | 1 | 2017-11-01 | |
| Dybdalstrand | Agder, Norway | 1 | 1 | 1 | 2015-05-27 | |
| Dysjalandsvågen | Rogaland, Norway | 2 | 1 | 1 | 2021-09-21 | |
| Engelsviken | Østfold, Norway | 1 | 1 | 1 | 2016-06-03 | |
| Greåker videregående skole | Østfold, Norway | 2 | 1 | 0 | 2019-09-22 | |
| Nautnes | Vestland, Norway | 1 | 1 | 3 | 2014-09-16 | |
| Risholmen | Vestland, Norway | 1 | 1 | 1 | 2017-09-03 | |
| Risør til Hisøya | Agder, Norway | 1 | 1 | 1 | 2013-03-20 | |
| Skøyen | Oslo, Norway | 1 | 1 | 0 | 2016-06-10 | |
| Søndre Karlsøy | Østfold, Norway | 1 | 1 | 0 | 2014-12-08 | |
| Vollen strandområde | Akershus, Norway | 2 | 1 | 1 | 2017-05-30 |
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