2011/12/31/ · Fish Compost: In two of the bins, composting will be done by alternating layers composed of the following: 1) a 6 inch layer of straw or pecan tree leaves mixed with , 2) a 2 inch layer of fish bones, heads and tails mixed with 1/2 inch of vegetable waste from commercial kitchens. Non-fish Compost: The other two compost bins will have identical