Protein Sources in Aquaculture Feed: Quality and Nutrition
Introduction “Feeding fish to fish”; this is, feeding wild fish meal (FM) and fish oil (FO) to aquaculture fish as “aquafeed”. This “Fish In, Fish Out” (FIFO) ratio, which Tacon and Metian (2008) used to show that more fish (in the form of FM and FO) is being consumed by fish than is produced by the aquaculture industry. For example, these authors calculated that it takes 4.9 tons of wild fish to produce every ton of salmon, therefore the FIFO ratio is 4.9:1, showing an ineff