The issues of green energy and solar photovoltaic have received international attention. Due to the wide breeding area of the southwest coast of Taiwan and sufficient sunlight, it was suitable for the
development of solar photovoltaic combined farming. The use of the cultivated area for the conversion of fishing and electricity symbiosis has potential for future development. Among them, the floating solar photovoltaic does not change the landform, has elasticity and flexibility, and was suitable for the co-development of fisheries and electricity. However, there are still many unknowns that need to be
researched on the combination of photovoltaic and traditional milkfish and Macrobrachium rosenbergii breeding. The shield rate was 40% and 0%. The temperature, salinity, pH value, DO value, ORP, EC, NO2- value, NO3- value, NH4+ value of the water quality parameters in the pond are compared under the same feeding conditions. Substrate parameters, growth and fullness index. The results showed that the environmental factors changed significantly with different climates in different months, and the shield rate was 40%. The water quality of the treatment group changed little, and the microalgae was stable and not prone to a large number of deaths. At the end of aquaculture, the bait activity of fish increased, and the increase in the amount of bait resulted in a significant increase in nitrite and ammonium values. During the breeding process, the water quality factors of the two treatment groups of milkfish were within the safe range, and the heavy metal values of water and soil were within the safe range of regulations. The stocking rate in the treatment group with a shield rate of 40% was 3,700 in each group, with a fullness index of 1.32, and the fullness index in the treatment group with a shield rate of 0% was 1.08. In this experiment, three ponds with an area of 755, 747, and 847 square meters were selected, and a solar floating platform was set up. The shielding areas were 0% (D1), 40% (D2), and 40% (D4) respectively. Farming of Macrobrachium rosenbergii. From the changes in water quality and the growth of pond shrimps, it was found that the water temperature was low and unstable in May and June, the control pond was exposed to large areas, and the water temperature was higher and grew better. The more days, the water temperature in the afternoon was as high as 36.2 °C, and the physiological phenomenon caused by he high temperature pressure resulted in a relatively low feeding rate, but the growth rate decreased. The automatic monitoring of water quality found that the water temperature was highest at 16:00 on sunny days, and the amount of dissolved oxygen reached the maximum at 17:00 to 18:00. Because the test pool covered the floating platform, the area blocked by sunlight and oxygen in the air was reduced. The amount was low. During the high water temperature period, the floating platform has a significant cooling effect. The test pond had relatively high ammonia nitrogen concentration and conductivity due to the large amount of bait and excretion, but it did not affect the growth of pond shrimp, while the concentrations of nitrate, nitrite, and sulfide had fluctuations with each other. The final result was shield. The shield 40% treatment of the experimental composition was better than the control treatment.