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stages of its life. Pfiesteria goes through transformations, similar to the metamorphosis of butterflies, but instead of four stages it has 20.
The amazing life cycle includes several hard-shell cyst stages where it hibernates on the bottom of the river until a stimulus awakens it to the zoospore stage where it grows and chooses one of several ways to eat. It has several vegetative stages where it can steal and store chlorophyll from algae. It can eat bacteria or it can eat fish.
If it chooses to eat fish, it becomes toxic and also begins to reproduce, forming gamines. It then prolifically reproduces until the fish are consumed and within a few hours suddenly transforms into different bizarre amoeboid stages and finally it returns to the hibernating cyst. The stages are like night and day in terms of appearance, said Lacouture.
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