Esterase Isoenzyme Variation in the Genus Saprolegnia, with Particular Reference to the Fish-pathogenic S. diclina-parasitica Complex

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Abstract
Esterase isoenzyme patterns determined by slab gel electrophoresis were compared for nearly 60 Saprolegia isolates, particularly from the S. diclina-S. parasitica complex. Consistent differences were found between S. diclina and S. parasitica isolates, with the latter having 1-5 very fast moving esterase bands that were generally absent from the former. A range of asexual (unidentifiable) isolates, taken from the vicinity of fish hatcheries or from fish lesions, were also examined; their esterase isoenzymes were similar to those of S. parasitica, although usually showing fewer bands. The use of esterase isoenzymes for screening potential fish pathogenic isolates of Saprolegnia is briefly compared with results obtained using oogonium morphology or cyst ornamentation, and the relative merits of each method are discussed. On the basis of their distinctive cyst coat ornamentation (bundles of long boathooks) and esterase isoenzymes, fish lesion isolates can be distinguished from saprophytic isolates, and isoenzyme analysis should provide a useful method for the screening of potential pathogenic isolates.