Pigeon Blood Discus Fish. The body of this fish is a warm reddish orange, and the fins are a speckled black; this black is the “pigeon blood” of the name. This was one of the first true mutations of wild discus to occur in a farm in the Far East. Pigeon bloods now are available with varying degrees of the black Discus fish are native to the slow and warm tropical waters of the Amazon River. They eat a variety of fresh water shrimp, worms, insects, and aquatic vegetation. In the wild, discus fish colors are limited to a few varieties which are earth tone in color. This helps to protect them from predators by allowing them to blend into their natural habitat.