Make Skinner blend sheets at the thickest setting on your pasta machine or cut slices from skinner blend blocks. These are small sheets. Just 1.5" X 1.5". You will need two sheets of each color. This you tube video shows how to make these block blends https://www.youtube.com/watch?v=UtxXtbd2vaw
Layer the sheets so that the dark and light ends are together.
Make two jelly roll canes. One cane will start rolling with the solid colors. The other cane will start the roll along the blends.
Form a fish body. For this one I used a ball of clay 1.6" in diameter.
Use the jelly roll with the color gradient to layer slices on the body like scales. Start at the tail and work towards the head.
Flatten the other jelly roll cane. Slice it in half. Sack the layers and repeat until you have a very short block cane with as many layers as you want.
Cut slices from the layered cane. Gather and squish one end of each slice to make the fins and tail.
Cut slits into the body of the fish to insert the fins. I learned this trick from a fellow member of the Tucson Polymer Clay Guild. If there is someone else I need to cite please let me know!
Add eyes and a mouth.
Here are some variations.