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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.

In a failed effort to protect endangered fish, the federal government decided without proper study to default to restricting the giant pumps at the bottom of the Sacramento-San Joaquin Delta.

So argues a lawsuit filed Friday at the U.S. District Court in Sacramento by a powerful consortium of water agencies. They’re hoping for a larger share of Delta water. It’s the latest salvo in a political and legal dispute over how to manage the competing demands on the fragile estuary.

California Gov. Jerry Brown has launched a campaign to extend some of the most ambitious climate-change programs in the country and ensure his environmental legacy when he leaves office in two years.

The centerpiece of the push is a cap-and-trade program that aims to reduce the use of fossil fuels by forcing manufacturers and other companies to meet tougher emissions limits or pay up to exceed them. The program has been one of the most-watched efforts in the world aimed at the climate-changing fuels.

The San Luis & Delta-Mendota Water Authority and Westlands Water District filed a lawsuit in federal court Friday to compel the U.S. Bureau of Reclamation to examine the effectiveness of the existing measures intended to protect endangered species, the environmental impacts of those measures, and whether there are alternatives to those measures that would better protect both endangered fish species and California’s vital water supplies.

The existing measures, adopted in 2008 and 2009, are based on biological opinions issued under the Endangered Species Act.

After multiple drought years, many Californians converted their lawns to more water-wise, native and low- maintenance landscaping — mostly with success, they report. Marysville and Yuba City both have landscaping following the trend, in collaboration with other agencies.