Abstract
In the present investigations the potential fungicidal ability of malachite green oxalate has been tested in vitro on four fish-pathogenic isolates of Saprolegniaceous fungi viz.,Saprolegnia ferax (Gruith) Thuret,Achlya flagellata Coker,Aphanomyces laevis De Bary andIsoachlya anisospora var.indica Saxena and Bhargava and the lowest concentration having fungicidal ability has been found to be 0.5 ppm. Tolerance tests have also been conducted usingPuntius sophore, Colisa lalia, Anabas testudineus andCatla catla as test fishes. Also the applicability of the lowest fungicidal concentration of this chemical (i.e. 0.5 ppm) in sustained culturing of the adult individuals ofCatla catla, a major food fish, against the mycotic infection, has been tested.
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