## 4 Discussion
### Applicability of Template of LYC-A
#### 4.1.1 The Rationality Selection of Environmental Factors in the Template  
Ocean temperature and salinity, chlorophyll-a and nutrient concentrations, suspended sediment concentration, sea currents, wind, the frequency of natural disasters, and sea depth and terrain are all important factors affecting site selection for coastal aquaculture areas [35; 36; 37; 38; 39; 40]. SST is a critical environmental factor in the cage aquaculture of large yellow croaker. Fluctuations in SST can directly affect the physiological activities and growth rates of large yellow croaker and may also indirectly impact their health and aquaculture efficiency by influencing other environmental factors such as nutrient salts and chlorophyll-a content [11; 12]. For instance, an optimal SST can enhance the metabolism and appetite of large yellow croaker, thereby increasing their growth velocity and aquaculture yield. However, SST that is either excessively high or low can lead to impeded growth and even trigger diseases and mortality in large yellow croaker [41]. Continuous monitoring of SST distribution enables the aquaculture areas to adjust their husbandry strategies in a timely manner, optimize the layout of their cages, and ensure the sustainability and economic benefits of large yellow croaker aquaculture. This approach is crucial for maintaining the health of the cultured species and for adapting to the dynamic thermal conditions of the marine environment. Investigating the salinity and temperature profiles in large yellow croaker cage aquaculture areas is essential for maintaining the health and productivity of the species. Salinity is a key factor in marine ecosystems, impacting the physiological processes of aquatic organisms by influencing osmotic balance. It is crucial for the health and growth of the large yellow croaker, and variations in salinity can signal changes in water origin, such as freshwater inflow or mixing with oceanic waters, affecting species distribution within aquaculture zones [35]. Monitoring salinity profiles is thus vital for understanding and managing water quality parameters critical to fish well-being. Similarly, the study of sea  
Figure 10: Results of SSM-LYC evaluation system for each potential cage aquaculture area of large yellow croaker. temperature profiles is vital for aquaculture, particularly in regions like the large yellow croaker cage aquaculture areas. It is essential because these temperature profiles directly affect the physiological processes of marine species, influencing their metabolic rates, growth, and reproduction. High temperatures can lead to increased metabolic demands and potential stress, while lower temperatures can slow growth and affect reproductive success. Considering the changes in profile temperature and salinity during site selection is helpful in evaluating whether the water environment in the culture area is suitable for the growth of large yellow croaker. In assessing the water environment for cage aquaculture along Zhejiang's coast, besides sea temperature and salinity, factors such as suspended sediment concentration, Chlorophyll a (Chl-a), nutrient availability, water depth, and the risks of red tides and storm surges are also crucial [35]. Suspended sediment, a key water quality parameter, can impede gas exchange, affecting aquatic organisms' health and dissolved oxygen levels. Chl-a is indicative of water productivity and phytoplankton biomass and reflects nutrient status, which is essential for the nutritional needs of large yellow croaker [36; 37]. Nutrient concentration, influenced by river inputs, is vital for phytoplankton growth and the croaker's food source, with high values typically nearshore. Water depth is critical for light penetration, currents, temperature stratification, and biodiversity, providing an optimal habitat while reducing disaster risks and ensuring the sustainability of aquaculture.