Abstract: Under the goal of “Carbon Neutrality”, fisheries are not only a major source of greenhouse gas emissions but also a potential carbon sink sector. This paper analyzes the characteristics of the carbon cycle in fisheries, showing that fisheries have distinct low-carbon advantages in protein production, and that shellfish and seaweed aquaculture systems especially demonstrate significant ecological carbon sequestration potential. The study proposes to promote the fisheries’ contribution to national “Carbon Neutrality” goals through three approaches: “identification and enhancement of fishery carbon sinks,” “calculation and reduction of fishery carbon sources,” and “construction of integrated models for synergistically improving emission reduction and carbon sink efficiency.” Practice cases from Tianjin indicate that the carbon emission hotspots of different fishery models are all concentrated in the feed use stage, while shellfish reef ecosystems and fish-solar complementary models stand out in enhancing carbon sinks and reducing emissions. In the future, it is necessary to establish a comprehensive monitoring system for carbon fluxes, strengthen full life-cycle carbon footprint accounting, explore the integration of ecological aquaculture technologies with clean energy, and develop green, low-carbon fishery development models that combine ecological and economic benefits, thereby providing replicable and scalable practical experience for achieving “Carbon Neutrality” in agriculture and rural areas.

Key words: fishery carbon sink, carbon footprint, low-carbon aquaculture, Carbon Neutrality, ecological aquaculture