Abstract
An attempt of classification by biological characteristics of some pathogenic water moulds from freshwater fishes.
Abstract
The genera Saprolegnia, Achlya and Aphanomyces in the Saprolegniaceae were classified according to some of their biological characteristics. The optimal temp. for growth were 20-25°C, 30-35°C and 25-30°C for Saprolegnia, Achlya and Aphanomyces, respectively. The 3 genera differed in their sensitivities to malachite green, NaCl, K2HPO4, sorbose and Polyphenon-100. The strains were decreasingly sensitive of NaCl and K2HPO4 in the order of Aphanomyces, Achlya and Saprolegnia, and to malachite green, Polyphenon-100 and sorbose in the order of Aphanomyces, Saprolegnia and Achlya. From sensitivity tests of Aphanomyces to Polyphenon-100 and sorbose, the pathogenic strain of A. piscicida was distinguished from saprophytic strains.
