Haibo Gong

Enhancement harvesting and filter-feeding fish stocking are increasingly applied in shallow eutrophic lakes, but their water-quality effects are difficult to evaluate because management signals overlap with seasonal and hydrometeorological variability. We analyzed dense Sentinel-2 observations of Taibo Lake during 2019–2026 using three management stages, phase-specific event windows, and matched forbidden-fishing controls. Regressions adjusted for antecedent precipitation and month used 25 scenes from the 2024 and 2025 events. Chlorophyll-related proxies were descriptively lower during enhancement harvesting than in the 2019 reference year, with no consistent advantage over forbidden fishing. The contrast with 2019 remains confounded by year-specific environmental conditions. Integrated optical and turbidity-related indicators showed no uniform directional change, and representative September scenes revealed substantial within-lake heterogeneity. Event-window comparisons showed no consistent immediate directional response to harvesting or stocking. Exploratory models suggested higher post-stocking normalized difference chlorophyll index (NDCI) values and high-NDCI ratios; only NDCI remained nominally significant after Bonferroni adjustment (adjusted p = 0.036 versus 0.204). Limited event replication and unmodeled temporal dependence precluded confirmatory inference. These findings support phase-specific water-quality monitoring with seasonally matched baselines and continued observation through the post-stocking period to inform adaptive enhancement-fishery management.

This study delves into the ecological implications of diverse fishery patterns on aquatic ecosystems, centering on environmental parameters, species richness, and nutrient dynamics. Using the ecological fishery management model of Yangming Lake as a case, it evaluates its influence on water quality improvement, species diversity promotion, and ecosystem stability maintenance. From 2018 to 2022, the Shannon–Wiener index in Yangming Lake increased by 17.34%, and water quality significantly improved, with phytoplankton biomass decreasing by 95.5%, total nitrogen content dropping by 33.69%, and permanganate index declining by 30.75%. Although ecological fisheries demonstrate certain effectiveness in tackling invasive species, further in-depth research is needed. This study emphasizes the importance of striking a balance between fishery development and ecological protection, in line with the United Nations Food and Agriculture Organization’s “blue transformation” strategy. Our findings offer valuable insights for sustainable fisheries development and highlight the necessity of customized management strategies to protect biodiversity and ecosystem resilience. Future research will focus on exploring the long-term ecological effects of ecological fisheries and the role of native carnivorous fish in controlling invasive species.