One of the things that define Finland is the Silakka or Baltic herring. The fish is typologically a subspecies of the normal herring; yet in the low-saline waters of the Baltic it only grows to a relatively small size, rarely reaching a length greater than the span of a hand. Previously, Baltic herring was an essential part of Finland's economy, and it is still fished in great quantities, both as fare for people and as feed for animals. What makes this such an important fish is its range of uses in food, as it can readily be smoked, baked, fried or preserved deliciously. All Finns grow up knowing numerous kinds, such as mustard herring and herring casserole. The Baltic Herring Festival, held each year in October, is a celebration of the fish at its best. The main market square gains stalls, and local fishermen come to dock their small wooden boats, selling their products. The atmosphere is like in the 'old days,' and people show their appreciation by appearing in great numbers.