Carbon sink fisheries generally refer to such fishery production activities that can facilitate biological absorption of CO₂ in the water and therefore remove carbon by harvesting hydrobiont; while in a specific sense, they refer to culturing, breeding and harvesting alga and filter-feeders to remove carbon from water and store or reuse it. Mariculture plays a vital role in transformation from the traditional mode to modern carbon sink mode. Sustainability with stable production can integrate and advance carbon sink fisheries into the strategic national Blue Granary development. However, such advancement and integration can only be initiated by a series of technological innovations like the choice of aquacultural variety with high carbon fixation, scientific combination of the aquatic life and deep-sea cage culture as well as some administrative innovations like state effort in marine ranching, international blue carbon trade and the Belt and Road cooperation in mariculture. Marine ranching is both the joint from carbon fisheries to Blue Granary and the embodiment of all the innovations.