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The carrying capacity of mariculture region is an important criterion to evaluate the sustainable development level of mariculture. This paper established an evaluation index system for carrying capacity of mariculture region which included pressure, state and response criterion layers with 14 evaluation indexes. Based on the data of coastal areas in China from 2008 to 2019, the entropy weight TOPSIS method was used to determine the weights of the indexes and calculate the comprehensive scores of the carrying capacity of mariculture region. The results showed that the carrying capacity of mariculture region in China increased year by year, and the comprehensive score increased from 0.342 in 2008 to 0.458 in 2019. Among them, the scores of the pressure layer and the state layer were higher, with an annual mean of 0.689 and 0.799 respectively, while the scores of the response layer were lower, with an annual mean of 0.318. The low response layer score was the most important reason for the low comprehensive score of carrying capacity of mariculture region in China. During the study period, the pressure of resources and environment caused by social and economic activities of coastal areas on mariculture region first decreased, then remained flat and then increased, and the health status and pollution degree of coastal areas showed a fluctuating trend. There were significant differences in the carrying capacity of mariculture region among the coastal areas. Guangdong Province had the highest average comprehensive score, followed by Hainan, Shandong and Jiangsu. The number of aquaculture technology extension institutions, the proportion of marine scientific research, education and management service industry, and the green total factor productivity of mariculture industry were the most important indicators affecting the carrying capacity of mariculture region. The proportion of mariculture output value in GDP, the discharge of chemical oxygen demand in wastewater, and the water quality of offshore sea areas also made great contributions to the carrying capacity of mariculture region.

In order to promote the high-quality and sustainable development of China′s mariculture industry, this paper constructed a theoretical model based on the influence mechanism between science and technology innovation, technology promotion and total factor productivity of mariculture industry, selected relevant data and variables in the coastal areas engaged in mariculture from 2006 to 2018, empirically examined the impact of science and technology innovation on the total factor productivity of mariculture industry and the role of technology promotion in the impact mechanism, and put forward development suggestions. The results showed that science and technology innovation played a significant role in promoting the total factor productivity of mariculture industry and technology promotion. Technology promotion played a significant role in promoting the total factor productivity of mariculture industry, and had an intermediary effect on the impact mechanism of science and technology innovation to improve the total factor productivity of mariculture industry. The empirical test results were robust after the substitution variable method and the supplementary variable method. In the future, China′s development of mariculture industry should further enhance the ability of science and technology innovation and technology promotion.

"Blue Granary" strategy is of great significance to ensure China′s food security. By summarizing and analyzing the hotspots and frontiers of the "Blue Granary" strategy, it has strong practical significance for the subsequent deepening of its research content. Based on the CNKI database, this paper made a statistical analysis of the relevant literature on "blue granary" strategy by using CiteSpace from 1992 to 2020. Chinese Fisheries Economics, Journal of Ocean University of China and China Fisheries are the main journals in this field. Shanghai Ocean University, Ocean University of China and China Academy of Fishery Sciences are the main publishing institutions. The cooperation among authors was also scattered, mainly in the same region or the same institution. At present, the main research hotspots are spatial distribution, community structure, biodiversity, dominant species, marine carrying capacity, land and sea coordination, etc. This paper summarized the important frontiers of the future research of the "Blue Granary" strategy as dominant species, artificial reefs, marine ranching, resource assessment and other related topics.