California wildlife agencies say the drought has pushed the endangered Delta smelt close to extinction. State and federal agencies announced Tuesday a joint effort to improve habitat conditions for the fish.

The plan is designed to prevent predators from eating the fish in the Sacramento-San Joaquin Delta. Most of those predators are not native. The California Department of Fish and Wildlife will spend $4.2 million from the state budget to eradicate invasive aquatic weeds where predators lurk. The strategy calls for assessing the feasibility of adding sediment to certain zones in the Delta to create the turbid waters where smelt hide.