In 2009 I was an intern for similar research project for NYC water supply. NYC DEP, Army Corps of Engineers, and DHS using blue gull sunfish with stress testing electrodes. Water was from aqueduct and if 4 if 6 showed stress a sample was collected and immediately analyzed for contamination. I was the for 2 years and the program still had a few more years of funding. Results were presented  NY. Water and Technology Conference. I'll try to find an abstract.