The article looks at how water quality affects fish farming in Lake Manzala, Egypt. Different factors like temperature, pH levels, and pollution impact the health of fish in the lake. Researchers found that sewage from urban and rural areas harm the water quality. Even though some sewage is treated before entering the lake, there are still big problems. Nutrient levels and harmful gases vary across different parts of the lake, with higher levels in the south. The study uses statistical methods to understand these water quality changes and how to manage them better.