Tiny fish caught in the Sacramento-San Joaquin River Delta,  are seen through a microscope at a California Department of Fish and Game laboratory in Stockton, Calif., Monday, July 25, 2005.  Researchers are ensnaring the fewest delta smelt and young striped bass since studies began in 1959.  The decline of these two fish populations and that of the longfin smelt and threadfin shad has some scientists fearing a meltdown of the ecosystem of the delta.(AP Photo/Rich Pedroncelli) Photo: Rich Pedroncelli, AP