This paper applies the concept of a circular economy to the fisheries sector to achieve sustainable and green development in fisheries. Through the use of physical, chemical, and biological technologies, fisheries waste is recycled and utilized as a resource. This study takes the anaerobic gas production method for fisheries waste as an example to explore the optimal fermentation gas production scheme for fisheries waste, comprehensively comparing the gas production effects of different mixing schemes between fisheries waste and various solid wastes. After applying the resource utilization technology for fishery waste described in this paper, an economic analysis is conducted to calculate the construction costs and benefits of the project, thereby verifying the economic viability of the resource utilization technology for fishery waste. The daily gas production process of anaerobic fermentation using a mixture of fishery waste, kitchen waste, and activated sludge is the most stable, with a total gas production of 31,159 mL over 40 days, significantly higher than other schemes. The cumulative present value of costs, cumulative present value of benefits, and cumulative net present value of benefits for the fishery waste resource utilization project are 7,568,000, 11,807,500, and 4,239,500 yuan, respectively. The internal rate of return is >0.1, the benefit-cost ratio is >1, the dynamic payback period is 2.50 years, the net present value after three years of operation is >0, and the net present value ratio is >0, indicating good economic benefits.
