WHAT ARE THESE FISH

Please help me, what are these fish? Large schools gathered
tightly together in the Providence River, Rhode Island.
They're about 18" in length. I can only guess invasive species,
maybe ocean-hungry spawning but I DON'T KNOW FISH.

http://www.asondheim.org/fish8.jpg
http://www.asondheim.org/fish19.jpg

Time: late afternoon/early evening.
Numbers: Approximately 1000.
Behavior: Swarming, schooling, occasional 'flashing' of sides.
Color: Seemed almost transparent, grey-blue, dull.

WHAT ARE THESE FISH I DON'T KNOW FISH


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