Good quality raw material is fundamental to the production of high quality fishmeal and fish oil. Raw material comes from capture fisheries (generally small, pelagic fish species) and, increasingly, byproduct such as fish trimmings from the processing sector. Many of the criticisms of the management of stocks are unfounded as the source fisheries are amongst the best managed globally, and these are naturally renewable resources that support global protein production. This is a function of the fast growth, high productivity and high levels of recruitment often seen in these fish populations, where, often the biggest influence on stock variability is environmental conditions (rather than fishing pressure). Often there are no direct human consumption markets for these species, and they support production of protein for which there is a very real demand, as well as fish oil which is used directly to achieve benefits for human and animal health.