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In page Aquaculture:

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Global wild fisheries are in decline, with valuable habitat such as estuaries in critical condition.[1] The aquaculture or farming of piscivorous fish, like salmon, does not help the problem because they need to eat products from other fish, such as fish meal and fish oil. Studies have shown that salmon farming has major negative impacts on wild salmon, as well as the forage fish that need to be caught to feed them.[2][3] Fish that are higher on the food chain are less efficient sources of food energy.[citation needed]