Abstract
AbstractExtracts from fertilization envelopes (FE) of activated eggs of two species of fish, Plecoglossus altivelis and Tribolodon hakonensis, have been demonstrated to contain carboxymethylcellulase, carboxymethylchitinase, β‐1,3‐glucanase (or laminaranase), lichenase, xylanase, dextranase, mannase, protease, and lysozyme activities by an agar plate method. Vitelline envelope (VE) extracts in contrast had no enzyme activities. The FE extracts exerted an antifungal or fungicidal action on the fungus Saprolegnia parasitica which was isolated from the body surface of a carp with mycosis. Inhibition of hyphal growth from the mycelial pieces was time‐dependent. The VE extracts had no antifungal action. FE extracts treated with pronase exerted no antifungal or fungicidal action on S. parasitica, but trypsinized FE extracts still retained their antifungal or fungicidal effect. These results suggest that the FE may be able to protect the embryo through enzymatic activity, which is acquired after the process of cortical reaction, and may help to degrade the cell walls of potential pathogens.
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