This research investigated how different amino acids affect the growth and biochemical activities of three types of water molds that can cause diseases in fish. The study helps us understand how these fungi process nutrients and potentially cause infections. Impact on everyday life: • Better understanding of fish diseases that affect aquaculture and fish farming • Improved knowledge for developing treatments for fungal infections in fish • Enhanced understanding of how fungi break down proteins, which is relevant for both disease control and industrial applications • Potential applications in developing new antifungal treatments • Insights that could help protect fish populations in both wild and farmed conditions