Malachite green is widely used in the aquaculture industry as an antifungal and antiparasitic agent to treat infections in fish and fish eggs. It is effective against diseases like ichthyophthiriasis and saprolegniasis, helping to maintain healthy fish populations. In addition, it has applications in the textile industry as a dye for silk, leather, and paper, providing vibrant green coloration. Historically, it has been used as a biological stain in microscopy to visualize bacterial and cellular structures. However, its use is restricted in many countries due to concerns about its potential toxicity and environmental impact.