Koi Angelfish Angelfish are a very popular species found in rivers all throughout the Amazon River basin. They are unique in appearance, very thin with long dorsal and ventral fins that can grow more than 6 inches long and 8 inches tall. Freshwater angels come in a variety of colors and patterns and get along with many other species, though its best to keep with fish too large for them to eat. Koi Angelfish have a marble pattern with an orange to red orange head, named after the pond koi fish with a similar color pattern. Scientific Name: Pterophyllum scalare Origin: South America Lifespan: 12 years Max Size: 6 inches Food: Flake, live, frozen Shipping Size: 1 inch to 4 inches