High-value fish species are crucial for deep-sea mariculture success, and China has implemented best management practices for breeding new species in these environments. This study identifies management modes of breeding seedling suitable for deep-sea in China by field interviewing representative provinces selected for their representativeness, suitability, and data availability. It explores local government best practices and examines the challenges and prospects. The results indicate that Shandong, Fujian, Guangdong, and Zhejiang employ a combination of management modes, including state-supported, market-oriented, industry-association-supported, and north-south cooperation modes. Despite advancements in management modes fostering the breeding of new species for deep-sea mariculture, challenges like limited land policies, inadequate land policy, inadequate technical and financial resources, degradation of traditional fish germplasm, and inefficient stock enhancement persist. Future management should prioritize optimizing land policy approval, in-situ germplasm conservation, resource banks, and stock enhancement. Furthermore, relay breeding and technical collaboration between northern and southern provinces are vital to enhancing Chinese seedling breeding advantages.
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