 Long-term efforts by the Rainbow Lake Coalition (a subcommittee of the SLCWEP) are now focused on the introduction of sterile white Amur carp, which have been proven to control excessive growth of watermilfoil for up to 10 years.Arizona Game and Fish requires mediation to ensure that the carp, a non-native fish, are prevented from escaping Rainbow Lake and potentially invading other water bodies.The Rainbow Lake Coalition is now working to design and construct a fish barrier on Walnut Creek below Lake of the Woods, which has used the carp for weed control for many years.