variety of climates differ from city to city so geography, climate, culture and ethnic mix determine the variety of local cuisine. Coastal areas The Pacific Ocean is the principal source of aquatic resources for Peru. Peru is one of the world's top two producers and exporters of unusually high-protein fishmeal for use in livestock/aquaculture feed. Its richness in fish and other aquatic life is enormous, and many oceanic plant and animal species can only be found in Peru. As important as the Pacific is to Peru's biodiversity, freshwater biomes such as the Amazon River and Lake Titicaca also play a large role in the ecological make-up of the country. Every coastal region, being distinct in flora and fauna populations, adapts its cuisine in accordance to the resources available in its waters. Ceviche, a Peruvian dish of marinated raw fish or seafood typically garnished with herbs and served as an appetizer, with many variations (pure, combination, or mixed with fish and shellfish), provides a good example of regional adaptation. Ceviche is found in almost all Peruvian restaurants on the coast, the shortly marinated seafood morsels are typically served with camote (sweet potato), and kernels of Peruvian choclo serrano. It can also be spelled "cebiche" in Peru, it is the flagship dish of coastal cuisine, and one of the most popular dishes among Peruvians. The marinade consists of Andean chili peppers, onions, and juices from an aromatic lime variety brought by the Spaniards. Before the Spanish colonists came to Peru, the Moche marinated seafood using fermented juice prepared from local banana passionfruit called Tumbo. But once the Spanish colonists arrived and brought with them citrus fruits, locals started using citrus to marinate their seafood. A spicy dish, it consists generally of bite-size pieces of white fish (such as corvina or white sea bass), marinated raw in lime juice mixed with chilis. Ceviche is often served with raw onions, boiled sweet potatoes (camote), and toasted corn (cancha). Many Peruvians believe that ceviche is an aphrodisiac and hangover cure, the latter possibly due to the fact that it is traditionally consumed with beer. Unlike the adaptations of ceviche made in Mexico and Ecuador, in Peru it does not have tomatoes. Also popular is Leche de tigre (tiger's milk), which is the Peruvian colloquial name for the marinade used in ceviche. It has a light spicy flavor. Chupe de camarones (shrimp cioppino) is one of