River Herring are anadromous, meaning they migrate from the sea up rivers and streams to breed and River Herring do that in April/May here in New England.

Blueback herring

Alewife
While there are obvious differences in the above depictions, it's very hard to distinguish between these fish when you are looking down into the water.
It was determined in 2006 that the Marstons Mills migration is that of alewives - because of their arrival in early April.
2 comments:
yes but do they taste different?
;)
(nobody was leaving a comment, so i thought i'd break the ice...)
They both taste the same - horrible...
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