Abstract
An Aphanomyces sp. recovered from and thought to be a pathogen of Atlantic menhaden was subjected to salinity stress to see if its behavior suggested that it was a salt-resistant isolate. Respiration during prolonged salinity exposure as well as hyphal morphology suggested a degree of salinity tolerance generally greater than previously reported for this or other saprolegniaceous fungi. Furthermore, zoo? spores were shown to germinate during salinity stress if exogenous nutrients are present. In vitro studies of salinity tolerance of saprolegniaceous fungi have demonstrated that some representatives exhibit substantial resistance to salt stress. Te Strake (1959) described vegetative growth of several species at salinities as high as 22.5 parts per thousand (ppt), while Harrison and Jones (1971) observed growth of Saprolegnia
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