While a farmer can control the inputs on to his land, ensuring that fertilizer and pest management and other products meet organic standards, that level of control isn’t really available in a natural body of water, says Lisa Bunin, CFS’s organic policy coordinator. For example, pollutants move freely through water, making it almost impossible to ensure a fish raised organically is not exposed. Further, some fish, such as salmon, are migratory, and stopping that migration would be adverse to the spirit of organic, Bunin adds.