No, I don't think there is a "yellow Scopas". By definition, Zebrasoma Scopas is colored brown (albeit in varying shades, depending on gepgraphy and on age). What you might call as a "local yellow Scopas" is really a local Hawaiian Yellow Tang!
The Hawaiian Yellow Tang (Zebrasoma Flavescens) is most common in Hawaii, but is not endemic there (meaning, it is found in many other parts of the Pacific, including various islands in Melanesia/Micronesia, and the Philippines). However, it is not common anywhere except in Hawaii.
It is true that many Philippine specimens are yellow-brown, rather than the bright yellow we have come to expect. But I have also seen locally-caught bright yellow ones for export (at least in the 1970's). So I don't know how to differentiate the local ones from the imported ones. But you can be sure that the LFS will set the price of bright yellow specimens at the level of the imported one
Phil
