A shrimp-farming business in the U.K. says it has created an economical and ecological alternative to traditional methods by using bacteria with a dual purpose -- to clean the water and provide food for the shrimp. Biochemical students from University College London founded the startup, called Marizca, which uses portable indoor units running on solar power to raise the shrimp. "The bacteria eat the shrimp waste and, at the same time, the shrimp eat the bacteria when they have reached a certain size. It makes producing shrimp a lot cheaper," said co-founder Leonardo Rios.

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