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Egg planting puts fertilized salmon eggs into a natural environment for the eggs to incubate, hatch, and grow. A specialized water pump setup is used to insert funnels several inches into the river bottom, mimicking a redd, or salmon nest. Female Atlantic salmon create these nests in the fall using their tail to dig a shallow pit in gravel. After laying eggs in the pit, the female covers them with gravel, which protects them throughout the icy winter and high water flows of early spring.