True Fungal infections, almost invariably a secondary infection. Invades wounds caused by parasites, bacterial infections or mechanical trauma.
Very hard to treat, since the few effective substances (Malachite green) cannot be used for food fish.
Multiple barcode assessment within the
Saprolegnia-Achlya clade ( Saprolegniales, Oomycota, Straminipila) brings
order in a neglected group of pathogens.
From IMA Fungus Dec. 2014 Monica M. Steciow et al.