Eco-CP grows macroalgae in the existing cage net aquaculture system to clean up the pollution of fish blood, internal organs and feces produced in deep-sea cage net aquaculture and uses macroalgae to absorb nutrients produced by fish. In addition to purifying the sea, it also produces biomass energy turned by the macroalgae. It is based on the concept of cradle-to-cradle circular economy, allowing fish and algae into a circulation, and solve the pollution during the process of breeding in the sea. While reducing pollution, it also increases the income from the production of macroalgae.