The Phantom Redtail catfish is an amelanistic color morph characterized by the lack of pigments called melanins. This means they lack the normal black color a regular morph would have. These will never turn black or have the gray shading on top, will always be full white The redtail catfish, Phractocephalus hemioliopterus, is a pimelodid catfish. In Venezuela, it is known as cajaro, and in Brazil, it is known as pirarara, stemming from the Tupi language words pirá and arara. Phractocephalus hemioliopterus, or redtail catfish, are often known as the vacuums of the tank that will not only eat anything they can fit in their mouth that looks appetizing but also grow to a grand length of 2 feet within one year! Their growth in length depends on how much they are eating and if they have enough in an aquarium to grow. These freshwater catfish are black on top and white stomachs as well as red tail fins. They are carnivorous but are often peaceful, and sometimes temperamental towards other species of fish. These particular redtail catfish are short body, which means their organs are the same size as a regular retail catfish but with just a short body length. These short bodies often grow slower than regular redtails but will grow to a large size, and have a large appetite nonetheless.