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Fishmeal is still one of the main protein sources used in commercial feeds for trout and salmon. But its availability is shrinking and its cost is increasing year by year. The sustainability of the aquaculture industry depends largely on its capability to replace fishmeal with alternative sources of protein, and to reduce the currently excessive protein levels commonly applied in the formulation of commercial diets. At the same time, feeds must be formulated to be effective in covering the nutrient requirements of specific species in order to maximise growth.