Driven by the dual forces of the digital economy and the rural revitalization strategy, China's agricultural live-stream e-commerce has become the core engine for reconfiguring the agricultural value chain. This article takes the tilapia industry in Maoming City, Guangdong Province as the research object. By analyzing its "live-streaming + industry" integration model, it reveals how the digitalized scenario reconstruction promotes the transformation of characteristic agricultural products from traditional sales to branding and globalization. The research finds that the Maoming tilapia industry achieved an average annual output value growth of 21% from 2020 to 2024 and an export volume exceeding 300 million US dollars in 2024 through three innovative strategies: "dual-scenario linked live-streaming", "full-chain data monitoring", and "geographical indication brand building". The research proposes a "technology-scenario-ecology" tripartite development framework, providing a Chinese solution for the digital transformation of the global tropical aquaculture industry.