Nemo is a Clownfish, specifically an Ocellaris Clownfish (Amphiprion ocellaris). Clownfish are small, brightly colored fish with distinctive orange and white stripes. They are also known as anemonefish because they live in a symbiotic relationship with sea anemones, which provide them protection. This species is commonly found in the warm waters of the Indian and Pacific Oceans, including the Great Barrier Reef.