Family: Østers (Ostreidae)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|---|---|---|---|---|---|
| Agderkysten | Agder, Norway | 2 | 2 | 2 | 2013-03-20 | |
| Agderkysten | Agder, Norway | 2 | 2 | 2 | 2013-03-20 | |
| Arendal | Agder, Norway | 1 | 1 | 1 | 2013-03-20 | |
| Arendal | Agder, Norway | 2 | 2 | 0 | 2013-03-20 | |
| Arendal | Agder, Norway | 2 | 2 | 2 | 2013-03-20 | |
| Arendal | Agder, Norway | 1 | 1 | 0 | 2013-03-20 | |
| Arendal kommune | Agder, Norway | 1 | 1 | 0 | 2013-03-20 | |
| Bekkevika | Vestfold, Norway | 13 | 2 | 0 | 2014-09-24 | |
| bjellandstrand | Agder, Norway | 1 | 1 | 1 | 2017-09-20 | |
| Bjellandstrand | Agder, Norway | 1 | 1 | 1 | 2014-05-14 | |
| 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 | |
| Espegrend | Vestland, Norway | 3 | 2 | 0 | 2001-01-24 | |
| Fra Risør til Hisøy | Agder, Norway | 1 | 1 | 1 | 2013-03-20 | |
| Greåker videregående skole | Østfold, Norway | 2 | 1 | 0 | 2019-09-22 | |
| Hansbakkfjæra | Trøndelag, Norway | 1 | 1 | 0 | 2018-05-23 | |
| håkonshella | Vestland, Norway | 1 | 1 | 0 | 2018-06-06 | |
| Håkonshella | Vestland, Norway | 19 | 2 | 14 | 2018-05-07 | |
| Håkonshella | Vestland, Norway | 3 | 2 | 0 | 2020-06-11 | |
| Håkonshellapollen | Vestland, Norway | 4 | 2 | 4 | 2017-05-31 | |
| Jomfruland | Telemark, Norway | 3 | 2 | 2 | 2013-05-14 | |
| Jonstø | Rogaland, Norway | 1 | 1 | 1 | 2010-12-29 | |
| Lille Groos | Agder, Norway | 1 | 1 | 1 | 2013-05-13 | |
| Nautnes | Vestland, Norway | 1 | 1 | 3 | 2014-09-16 | |
| pollen | Vestland, Norway | 4 | 2 | 2 | 2019-06-13 | |
| Refsnesstranda | Østfold, Norway | 3 | 1 | 0 | 2014-08-27 | |
| Risholmen | Vestland, Norway | 1 | 1 | 1 | 2017-09-03 | |
| Risør til Hisøya | Agder, Norway | 2 | 2 | 2 | 2013-03-20 | |
| Skottevik | Agder, Norway | 1 | 1 | 1 | 2013-09-11 | |
| Skøyen | Oslo, Norway | 1 | 1 | 0 | 2016-06-10 | |
| Søndre Karlsøy | Østfold, Norway | 1 | 1 | 0 | 2014-12-08 | |
| V. Måsane | Akershus, Norway | 16 | 1 | 0 | 1996-10-08 | |
| Valen | Vestland, Norway | 1 | 1 | 1 | 2014-06-05 | |
| Vignesvågen | Rogaland, Norway | 1 | 1 | 0 | 2010-12-29 | |
| Vollen strandområde | Akershus, Norway | 2 | 1 | 1 | 2017-05-30 |