## 3 Results and Discussion
### Dielectric Heating Experiment  
The dielectric heating experiment examined temperature profiles of fish scales and muscle over a 120 s period at various distances from the horn antenna. As shown in Figure 9, data from three independent trials (_n_ = 3) reveal temperature differences influenced by tissue type and antenna distance, with standard deviation represented by error bars. The heating behavior corresponds with the power density Equation (4), indicating that energy absorption depends on electromagnetic field strength and tissue dielectric properties. At shorter distances (3 cm and 6 cm), both scales and muscle tissues rapidly exceed 70 \({}^{\circ}\)C. While this facilitates parasite inactivation, it also leads to muscle heating above 60 \({}^{\circ}\)C, as evidenced in Figure 10, where dehydration and protein denaturation are observed. This reduces the thermal selectivity between tissue layers. At 9 cm, however, selective heating is achieved. Scales reach 70 \({}^{\circ}\)C at approximately 75 s, while muscle temperatures remain around 44.0 \({}^{\circ}\)C. This temperature gap supports Equation (2), as electromagnetic energy is primarily absorbed in the outer scale layer, with limited penetration into deeper tissues. Thermal imaging in Figure 10 confirms the visible separation in thermal exposure between the two tissues. These findings illustrate the principle of selective heating, where distinct dielectric properties result in differential energy absorption and temperature profiles, aligning with Equation (4). The experimental results are further illustrated in Figure 10, which visualizes the spatial thermal distribution and physical changes after heating. This figure provides visual validation of the system's selectivity, demonstrating clear thermal gradients between fish scales and muscle tissues at different antenna distances. At 9 cm, the scales reached sufficient temperatures for parasite inactivation, while the muscle remained below the denaturation threshold. These visual observations reinforce the numerical findings from Figure 9 and support the practical application of dielectric heating for targeted treatment. At 12 cm, scales only reach 69.1 \({}^{\circ}\)C after 90 s, and muscle remains below 33 \({}^{\circ}\)C, indicating insufficient heating for reliable parasite inactivation. This diminished heating efficiency supports the prediction of reduced power density at longer distances from the antenna, as described by Equation (2). Despite minor variations in tissue response--possibly due to differences in sample composition or slight antenna misalignments--the overall pattern remains clear. The 9 cm distance achieves optimal results: sufficient heating of parasite-laden scales while maintaining muscle temperature below thermal damage thresholds. In contrast, 12 cm proves ineffective, and 3 cm risks overheating the muscle. Thus, 6 cm and 9 cm represent promising configurations, with 9 cm providing the clearest thermal separation, making it particularly suitable for selective dielectric heating in fish tissue processing. At 12 cm, the difference in heating behavior between tissues becomes even more pronounced. The fish scales reach only 69.1 \({}^{\circ}\)C after approximately 90 s, while the muscle tissue remains below 32.7 \({}^{\circ}\)C throughout the entire heating period. This suggests that electromagnetic energy penetration at this distance is significantly reduced, resulting in insufficient heating for effective parasite inactivation, particularly in deeper or more embedded regions. This observation aligns with Equation (2), which predicts a drop in power intensity and heating efficiency with increased distance from the antenna. Thermal imaging data from Figure 10 further support this conclusion, showing uneven energy absorption and weaker thermal separation, thereby confirming that 12 cm is not suitable for reliable parasite control.