The borough is also home to Mexico City and Mexico's largest fish market, called La Nueva Viga, in Colonia San José Aculco on Prologación Eje 6 Sur. With 202 wholesalers and 165 retail outlets, it distributes about 60% of the country's seafood production along with much of what is imported. The market begins business at 4:00 a.m., when delivery trucks bring in fresh fish from all over Mexico to the vendors. This daily delivery is about 500 tons and includes all kinds of seafood from shrimp to fish to shellfish to small sharks and manta rays. The main fish market is here due to Mexico City's role as economic center since the pre Hispanic period.