This development has been supported by the growth of more large scale processing facilities that provide enough waste to justify the investment in a fishmeal plant at the end of the processing line. However, total production of these commodities and the quantity of fish reduced into fishmeal and fish oil are known. Combining this with an estimate of the fishmeal and oil yield from reduction fisheries, the quantity of fishmeal and oil produced from residues can be inferred. Data from Pern, where fishmeal and oil production is dominated by the reduction fishery, were used to estimate these yields.