This count number tells you approximately how many shrimp are in a pound. Higher count shrimp means they are smaller while larger count shrimp are bigger. So, 51/60 count shrimp means there are approximately 51 to 60 shrimp in a pound. This means they are smaller in size compared to 21/25 count shrimp. Understanding this count number will help you choose the right-sized shrimp for your recipes.