## 3 Results
### Template of Environmental Factors for Lyc-A
#### 3.2.2 Marine Hydrological Factors Contributing to the Template for LYC-A
A comprehensive assessment of the background fields along the Zhejiang coast is essential for delineating the hydrodynamic characteristics of large yellow croaker cage aquaculture zones. This study encompasses a detailed analysis of wind patterns, ocean currents, and other critical water column properties, which are pivotal  
Figure 7: Sea temperature profile and salinity profile of typical large yellow croaker cage aquaculture area in coastal Zhejiang province. A–D are the four latitudinal profiles of the study area. (**a**) is the temperature profile, and (**b**) is the salinity profile. for characterizing the environmental conditions conducive to fish growth and health. By integrating these large-scale environmental factors, a nuanced understanding of water quality, nutrient dynamics, and thermal stratification is achieved. This synthesis is crucial for identifying areas with optimal conditions, facilitating the strategic identification and demarcation of prospective aquaculture sites. Such delineation enhances the productivity and sustainability of aquaculture operations while ensuring the ecological integrity of the marine environment, aligning with broader goals of environmental stewardship and economic prosperity. In the large yellow croaker cage aquaculture areas north of 30\({}^{\circ}\)N, the current velocity exhibits distinct seasonal variations (Figure 8I-K). During spring, the flow rates range from 0.07 to 0.09 m/s (Figure 8I), escalating to 0.1 to 0.2 m/s in summer (Figure 8I). The autumn months witness a further increase, with currents ranging between 0.2 and 0.24 m/s (Figure 8K), while winter experiences the highest velocities, fluctuating between 0.17 and 0.26 m/s (Figure 8L). These variations in current velocity are crucial for understanding the hydrodynamic conditions that influence the aquaculture environment and the physiological responses of the fish. South of 30\({}^{\circ}\)N, the seasonal current velocities are notably different. In spring and summer, the flow rates are relatively lower, with ranges of 0.04 to 0.05 m/s (Figure 8I) and 0.1 to 0.16 m/s (Figure 8J), respectively. Autumn and winter currents are moderate, with velocities in the range of 0.11 to 0.14 m/s (Figure 8K) and 0.12 to 0.14 m/s (Figure 8L), respectively. Figure 8: The coastal hydrological element map of the study area. Panels (**A–D**) show the seasonal average sea surface temperature distribution maps of the study area, including isotherms. Panels (**E–H**) present the seasonal average sea surface salinity distribution maps, including isohalines. Panels (**I–L**) depict the flow field distribution, while panels (**M–P**) illustrate the wind field distribution. Data sources are detailed in Table 4.  
In terms of wind speed, the large yellow croaker cage aquaculture areas north of 30\({}^{\circ}\)N experience a significant increase from spring to winter. Spring winds average between 3 and 3.6 m/s (Figure 8M), peaking in summer at 6 to 7 m/s (Figure 8N) and further intensifying in autumn to 7 to 8 m/s (Figure 8O), culminating in the strongest winds in winter, ranging from 8 to 9 m/s (Figure 8P). Conversely, in the regions south of 30\({}^{\circ}\)N, the wind speed profiles show a different pattern, with spring and summer winds at 2 to 3 m/s (Figure 8M) and 4 to 5 m/s (Figure 8N), respectively. The highest wind speeds are observed in autumn and winter, with velocities reaching 8 to 9 m/s (Figure 8O) and 9 to 10 m/s (Figure 8P), respectively. These pronounced seasonal and latitudinal variations in wind speed are integral to the assessment of the overall meteorological conditions.