In the freshwater ponds and brackish estuaries of this region there are large populations of shrimp that the trout go bonkers over. They are different than the scuds more frequently seen out west. They look in fact just like little shrimp from the seafood store - but straighter. They propel the majority of the time using their swimmer fins under the tail and only do the herky jerky cupped tail thing when in being pursued. They are somewhat transparent yet have a distinct profile and it's obvious that fish love them.
When you mention cutthroat, I presume you are from the west? Can you talk a little about the conditions and species you fish?