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In page Common carp:

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In Utah, the common carp's population in Utah Lake is expected to be reduced by 75 percent by using nets to catch millions of them, and either giving them to people who will eat them or processing them into fertilizer. This, in turn, will give the declining population of the native June sucker a chance to recover.[3] Another method of control is to trap them with seine nets in tributaries they use to spawn, and exposing them to the piscicide rotenone. This method has been shown to reduce their impact within 24 hours and greatly increase native vegetation and desirable fish species. It also allows native fish to prey more easily on young carp.[citation needed]