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The piranha releases a hormone into the water when it is ready to spawn. Both fish become dark in color and they act territorial and aggressive to any intrusions. They build a nest, clearing plants and stones with their tails etc. The male then goes into the nest and persuades the female to join hum. This is where she lays her eggs, and where the male then fertilizes them. He will then stay guard over the eggs and sometimes the female will assist him in doing so, as well.

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12y ago

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