Slate blue alfonsino is a Tilapia that is raised in a tanks at Penguin Provisions in Sebastopol, California. It is a beautiful fish that is known for its color and distinguishing features. Slate blue alfonsino is a fish that is known for its color and distinguishing features. It is a light blue color with a dark blue body. Its head and body are light blue and its fins are dark blue. Slate blue alfonsino is a fish that