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In page Common carp:

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An egg-layer, a typical adult female can lay 300,000 eggs in a single spawn.[1] Although carp typically spawn in the spring, in response to rising water temperatures and rainfall, carp can spawn multiple times in a season. In commercial operations, spawning is often stimulated using a process called hypophysation, where lyophilized pituitary extract is injected into the fish. The pituitary extract contains gonadotropic hormones, which stimulate gonad maturation and sex steroid production, ultimately promoting reproduction.[citation needed]