Development of carbon sink technology is one of the important emissions for net zero. Establishment of multi-trophic aquaculture (IMTA), aquavoltaic technology model, and development of carbon budget methodology is helpful to achieve the goal. Integrated multi-trophic aquaculture is Integrate species with different nutritional levels, including algae, fish, and crabs. Evaluate the water consumption and feeding amount of aquaculture, and analyze the carbon budget. This study also evaluated the carbon budget of grouper under different solar panel construction methods. The establishment of carbon budget methodology can be used as the basis for carbon pricing and carbon trading. Promote aquaculture to achieve the goal of net zero carbon reduction and sustainable development.