| Common Name | Latin Name | Status* |
| Alewife, Gasperau | Alosa pseudoharengus | (r) |
| American Eel | Anguilla rostrata | (r) |
| American Shad | Alosa sapidissima | (e) |
| Atlantic Salmon | Salmo salar | (e) |
| Atlantic Tomcod | Microgadus tomcod | (probably e) |
| Blueback Herring | Alosa aestivalis | (r) |
| Brook Trout | Salvelinus fontinalis | (r) |
| Brown Bullhead | Ameiurus nebulosus | (i) |
| Chain Pickerel | Esox niger | (i) |
| Rainbow Smelt | Osmerus mordax | (r) |
| Smallmouth Bass | Micropterus dolomieui | (i) |
| Striped Bass | Morone saxatilis | (e) |
| White Perch | Morone americana | N/A |
| White Sucker | Catostomus commersoni | N/ |
The Petitcodiac River’s marine species have been severely impacted by the construction of the causeway in 1968. By the end of the 1980s, at least six species had completely disappeared from the watershed, including Atlantic sturgeon, American shad and the distinct Inner Bay of Fundy Atlantic salmon, since declared endangered in Canada.
This list also includes the Dwarf Wedgemussel, which used to live in abundance in the Petitcodiac River, its sole known location in the country. Today, this small mussel is extirpated from Canada and found in only nine American watersheds. Its elimination is attributed to the Petitcodiac causeway.
The education poster that follows, produced by Riverkeeper in 2005, lists the various marine species of the Petitcodiac. The restoration of fish passage at the Petitcodiac causeway will allow most of these species to be re-established in our ecosystem.
Click this link to see the poster