A Physiological and Morphological Study of Saprolegnia Parasitica

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Abstract
Summary1. Isolations of Saprolegnia parasitica were made from five localities in Michigan and were taken from five species of fish.2. Detailed physiological experiments were made on the mycelium derived from a single spore isolation from white fish eggs obtained from the State Fish Hatchery at Bay City, Michigan. The experiments were made to determine if possible whether or not 5. parasitica was a sterile species as has been supposed.3. It has been shown that the morphology of this fungus can be controlled largely by modifications of the environmental conditions. These modifications are based upon the Klebsian hypothesis that vegetative and reproductive processes can be controlled by a gradual reduction of the nutritive supply.4. Oögonia and antheridia were produced on the mycelium in certain experiments tried. This is the first time that sexual organs have been shown to exist for S. parasitica.5. Peptone was found to be the stimulus for sexual reproduction when used in combination with leucin or with mal...

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