Word of the Day: Alewife

so this sign had me wondering "what the F are alewives?" Nothing a quick trip to Wikipedia can't handle.

The alewife (Alosa pseudoharengus) is a species of herring. There are anadromous and landlocked
forms. The landlocked form is also called a sawbelly or mooneye (although this
latter name is more commonly applied to Hiodon spp.). The front of the
body is deep and larger than other fish found in the same waters

I assume this is how Alewife station on the red line was named as well. I always thought it was a dumb name but now I kind of dig it. Although Sawbelly Station would be much cooler.