About 1,000 fish died at Calaveras Lake as a result of low dissolved oxygen in the water, a Texas Parks and Wildlife Department (TPWD) spokesperson said.On Tuesday, TPWD was notified of the fish kill from the Texas Game Wardens. The majority of fish that died were red drum, TPWD said.CPS Energy manages the lake as a cooling reservoir for nearby power plants, TPWD said.The CPS Energy Environmental Operations Staff took dissolved oxygen readings o…