Effect of Blue Finance and Marine Environmental Quality on the Marine Fishery Economy

This study investigates the effects of blue finance and marine environmental quality of the marine fishery economy using panel data for marine fisheries in China’s coastal provinces spanning 2011–2023. We use entropy, moderating effects, and threshold effects to calculate the level of blue finance and marine environmental quality, the moderating role of marine environmental quality in blue finance’s effect on the marine fishery economy, and the threshold effect of blue finance and marine environmental quality on the marine fishery economy. We find that (1) blue finance can improve the marine fishery economy, with an influence coefficient of 0.245. (2) Marine environmental quality plays a significant positive moderating role in blue finance’s effect on the marine fishery economy, with an influence coefficient of 0.325. (3) Blue finance and marine environmental quality have a first-order threshold effect on the marine fishery economy, showing a U-shaped nonlinear relationship.