Topic summary
Alewives
Extracted from the Wikipedia article Alewife (fish).
The alewife or river herring (Alosa pseudoharengus; pl.: alewives) is a species of herring found in North America. It is commonly anadromous but there are also significant landlocked populations. It is one of the smaller species of shad, of the subgenusPomolobus. As an adult it is a marine species found in the northern West Atlantic Ocean, moving into estuaries before swimming upstream to breed in freshwater habitats, but some populations live entirely in fresh water.