Finfish eggs are prone to fungus, and to a lesser extent bacterial infections.  Some species are particularly vigilant, removing dead or fungal-invested eggs from the rest in order to eliminate the risk of spread.  This occurs predominantly in “mouth-brooders”, those that store and protect eggs within the mouth.  However, others are not so attentive and as a consequence, mild fungicides such as Methylene Blue or diluted Formalin may be used. 

The implication of using such methods could result in toxicity towards the handler and fish if incorrect usage occurs, and therefore signals the need for effective yet safe controls.  Currently, the use of copper sulfate at concentrations of 5ppm is being conducted by scientists at the Harry K. Dupree Stuttgart National Aquaculture Research Center, Stuttgart, AR.  The data will be submitted to FDA for consideration once this is complete.    

For further information please refer to http://www.ars.usda.gov/research/publications/publications.htm?seq_no_115=184374.