Fish found in the salt marsh tidal creeks of the Plum Island Estuary, Massachusetts.
Does not include open estuary/bay species.
| Family | Scientific name | Common Name |
| Anguillidae | Anguilla rostrata | American eel |
| Atherinopsidae | Menidia menidia | Atlantic silverside |
| Clupidae | Alosa aestivalis | Blueback herring |
| Clupidae | Alosa pseudoharengus | Alewife |
| Fundulidae | Fundulus heteroclitus | Mummichog/killifish |
| Gasterosteidae | Apeltes quadracus | Fourspine stickleback |
| Gasterosteidae | Gastroteus aculeatus | Threespine stickleback |
| Gasterosteidae | Pungitius pungitius | Ninespine stickleback |
| Moronidae | Morone americana | White perch |
| Sygnathidae | Sygnathus fuscus | Northern pipefish |