GHOST SHRIMP IS A BIT SMALLER THAN THE SHRIMP. PLUS THEY LOOK WAY DIFFERENT THAN STORE BOUGHT SHRIMP. YOU SHOULD BE ABLE TO TELL. WERE THEY ALIVE??? GHOST SHRIMP IS USUALLY SOLD LIVE. IF NOT, THEY WERE PROBABLY REGULAR SHRIMP. BTW, I USE SHRIMP ALL THE TIME, BUT TO LET YA KNOW I TEND TO ALWAYS LEAN ON SMALLER FISH WITH IT. THE BIGGER FISH I GUESS JUST EITHER DON'T FALL FOR IT, OR IT'S USUALLY CROWDED BY SMALLER FISH THAT IT GETS BIT OFF BY THE TIME THE MONSTERS COME. ALSO, BAIT FISH, AND BABY FISH LOVE SHRIMP, SO YOU'LL LOSE IT EVERY CAST UNLESS ONE SNAGS ON. GREAT BAIT THOUGH.