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Malachite Green

Malachite Green is used to treat fungal infections.  Malachite Green is directly applied to the fish body as a 1% solution (1g in 100ml of water).  For smaller fish, a 0.5% solution can be used.

Malachite Green also protects eggs of fish from fungal infections.  However, there are controversies surrounding this drug.  Some research suggests a link between malachite green and cancer symptoms in rats. 

This has led to this drug being banned in the aquaculture industry.