Exploring the Drivers of Spatiotemporal Patterns in Fish Community in a Non-Fed Aquaculture Reservoir

Non-fed aquaculture is an important contributor to low environmental impact protein production. However, knowledge of spatiotemporal patterns the fish community in non-fed fishery systems remains limited, despite their ecological importance for sustainable and fisheries. To elucidate status fisheries critical drivers systems, hydroacoustic surveys were conducted seasonally Hongchaojiang Reservoir two seasons (spring autumn) consecutive years: 2018 2019. Results showed that average density was 121.6 ind./1000 m3. Fish communities varied significantly between geographical locations seasons. On temporal scale, densities October higher than those April. spatial upstream (S1 S3) midstream (S2, S4, S5, S6), while S7, S8 S9 downstream lowest. Trophic level index, zooplankton, chlorophyll-a, phytoplankton play vital roles distributional patterns, target strength, which reflects body size, highly associated with water temperature, dissolved oxygen, total organic carbon, phytoplankton. These results suggest distribution jointly influenced by biotic abiotic variables bodies, highlight nutrient levels food availability shaping system. This study should improve our understanding dominant stocks provide information successful management purification