International Journal of Marine Science, 2025, Vol.15, No.5, 277-286 http://www.aquapublisher.com/index.php/ijms 283 proving the feasibility of targeted breeding for regional dominant species. This model can be promoted nationwide: coastal areas can carry out breeding of good varieties based on the main local aquaculture fish (Wang and Wu, 2025), form a regional good varieties system of "one province, one product" or "one bay, one product" to improve the core competitiveness of local fisheries. This case emphasizes the role of scientific genetic assessment in breeding. By measuring the heritability and correlation of growth traits of mackerel before breeding, we must adjust our breeding strategies in time and focus our main focus on the weight traits with the greatest potential for genetic improvement. This data-driven decision-making improves selection efficiency and avoids ineffective efforts. 7.2 Reference effect on breeding of other seawater fish in China Similarly, in other species breeding, systematic genetic parameter determination and analysis should become a necessary link. In recent years, a considerable number of genetic assessment data of varieties have been accumulated in China, such as yellow croaker, shrimp, mandarin fish, etc. These data should be used to guide breeding practices and limited resources should be invested in traits and groups with the greatest genetic potential. The successful breeding cases of Hainan mackerel show that genetic improvement and fishery resource conservation can complement each other. Increased breeding yield through artificial breeding can reduce the fishing intensity of wild populations while meeting market demand (Sun and Mai, 2025). When the breeding industry can provide stable mackerel products, consumers will no longer rely on fishing for wild individuals, thus giving wild resources the opportunity to recuperate. Going further, the practice of preserving wild gene banks during breeding also provides guarantees for resource protection. The living germplasm resource library and sperm freezer we established preserved the original germplasm of mackerel in Hainan and surrounding waters, leaving a way out for future breed improvement and resource recovery. This concept of combining "breeding, breeding and protection" is worth promoting in the fishery production of other species. 7.3 Thoughts on promoting industrialization and sustainable use of resources The organization and implementation of Hainan mackerel breeding project reflects the strong advantages of industry-university-research cooperation. The division of labor and cooperation between the two sides has accelerated the breeding process and enabled enterprises to master the breeding technology of good breeding through participation. This "small core and big collaboration" model is exactly the direction of the development of modern aquatic seed industry. China has relatively insufficient original technology in the field of aquatic breeding, and scientific research institutions, universities and enterprises need to jointly build a collaborative innovation system and cultivate new varieties with independent intellectual property rights through joint research and development. The successful experience of Hainan case shows that only by closely combining scientific research with production, allowing breeding experts to go to the front line, and allowing enterprise technical personnel to participate in breeding can we quickly and well breed new varieties needed by the market. From an industrial perspective, this case has significant demonstration and promotional significance. As an economic fish that used to rely mainly on fishing, mackerel has achieved breakthroughs in breeding in a short period of time through artificial breeding and improved product supply capacity. This sets an example for other marine fish farming in China and enhances the industry's confidence in breeding of good varieties. With the country's high attention and policy support for the aquatic seed industry, more and more seawater fish will be included in the breeding program. A batch of new fish species with faster growth rate and stronger disease resistance will continue to emerge, helping the transformation and upgrading of the marine aquaculture industry. Currently, China's marine fish farming output only accounts for 6.6% of the national aquaculture fish, and there is huge room for development. 8 Future Outlook and Application Traditional breeding relies on parental phenotypic screening, has a long cycle and is susceptible to environmental influences. Genome selection uses genome-wide molecular marker information to predict individual species values, and potentially excellent parents can be selected in the juvenile stage. This method is especially effective
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