There are several threads on standards for different varieties but I couldn't find any pearlscale standard articles here, or a pearlscale culling article. A quick Google search is also nearly useless other than the very basics. The AGA site has some older (and a revised) standard which I'll show here and I found a few other illustrations which I thought might be helpful. Pearlscale keepers are certainly in the minority here but in the interest of representing different varieties I am hoping this will be helpful to any newcomers or those interested. Here are the old pearlscale standards and comments courtesy of the AGA. I hope its ok to share these - I thought it might be nice to have them consolidated here on the forum along with others for comments and viewing. This is a nice actual example of the difference in the head growth. These I found in an attempt to find illustrations, not sure of the source. The first example is a crown, and the second is a hama nishiki example. These also show some color options which is helpful. From my own young fish, I'll show my better (not perfect) pearlscales, a sort of middle of the road pearlscale, and two with more obvious faults. Poorer fish first. The first fish has nice deep color but is lacking the rounded body shape. This fish also has too much head growth in other areas of the face, giving it a bit of a frog like appearance. It does not have the correct back curvature either. Seen here next to a more rotund sibling for body comparison. This second fish has interesting color but the caudal is very stiff and sits nearly fully horizontal and creates an awkward swimming motion. It lacks well developed pearls. This fish also has too much head growth in the cheeks and lacks a very round body. Here compared to a sibling. So - so pearlscale is up next. This fish has a rounder body and good color. Compared with siblings. These last two are my best pearlscales. Keep in mind these are all juveniles and still developing. They came with some minor issues that I can't remedy like curled fins and broken rays in some cases. What I like about these is the very round bodies, proportions of fins to body, back curvature and overall balanced swimming motion and appearance. This is by no means a comprehensive or perfect guide, but I wanted to put something together. I'm hoping more examples and info can be added by other members here.