Mysis Shrimp in Hagg Lake?

On a recent trip to Hagg Lake, I found myself floating thru a patch of dead bugs.  Not unusual around here.  What was unusual was that these were bigger than most of the bugs that were out and didn't look like any of the standard lake top breeders. 
Upon closer inspection, these "bugs" appeared to be shrimp.  Anyone care to take a stab at identifying these critters?

-Spot-

I think they are mayfly nymph shucks left after the adults hatched. 

I think they are mayfly nymph shucks left after the adults hatched.

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