In this Wednesday, July 15, 2015 photo, Luke Ellison, research supervisor at the University of California Davis Fish Conservation and Culture Lab, displays a Delta smelt that he has just placed an orange identification tag on for future study at the lab in Byron,Calif. The tiny, endangered fish, found in the Sacramento-San Joaquin River Delta, is at the center of the state's water battle between farmers while biologists. (AP Photo/Rich Pedroncelli)
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