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Fig. 3 Morphology, survival rate, and hatching delay percentage of Saprolegnia parasitica challenged zebrafish embryos. A, B. S. parasitica zoospores were germinated and started growing on the surface of chorion at 3-hr post infection (hpi) and 6 hpi. White dotted line indicates the grown length of mycelium; C, S. parasitica mycelium penetrated into a whole embryo and grown inside the embryo at 30 hpi; D, E, Abundant mycelium growth in the dead embryos at 3 hpi and 12 hpi; F, Mycelium growth on the chorion which remained after hatching; G, Cumulative survival rate and hatching delay percentage of embryo exposed to S. parasitica secondary zoospores. Survival and hatching rate percentage of embryos were the means of 6 individual groups (10 embryos in each group).