We started with our salad spinning plates and i cut out a triangle section from the plate while talking to Tara about the circle plate shape and the triangle shape that would be his tail.
I stapled around the edges of the plate(you can insert dress makers wadding inside for a puffier fish!) and placed the tail on the end and stapled. Tara chose some eyes for each side and tied a string to the top to hold him.
After reading "the rainbow fish" by Marcus Pfister we added some glitter by using glitter pens and a small paint brush. Some more Rainbow fish activities are found at http://www.dltk-teach.com/books/rainbowfish/