Rich Simmers submits-
Joey
These fish arrived in schools yesterday in the inner harbor…
Similar to not as flat or deep bodied as the American butterfish … much beefier too
American Butterfish
Blue Runner
Notice the distinctive pectoral fin and the vertical bands of the BRJ
Wiki says they’re common to these waters – who knew?!
Joey comments-
I’ve never seen them come across my dock I guessed that it was a butterfish but Rich says it’s much thicker. Interesting.
I asked Pete Mondello about them and he says that they game fish from down south and have been around all summer. They are up here because of the abnormally warm water we had this spring and will not make it back down south and will die because the water will get cold too fast.
Good Morning Gloucester 
So interesting-thanks for posting.
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It is called a Spine Ridged Stickle Back.
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looks like a pretty good match with the Blue Runner Jack to me from checking google images
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