The Radias is a species of freshwater fish native to the lakes and rivers of Arcadia. These brightly colored fish mostly feed on algae and insect larvae.
Due to their size (ranging between 50 to 70 centimeters) and them being schooling fish, there aren't well suited to be kept in an average home. However, specialized aquariums have noted significant success when it comes to breeding and housing these fish.

They are often preyed upon by several different types of predators, including smaller wyverns and drakes. Though most humans find them to be too pretty to eat, they are said to taste really good.