One of California’s foremost experts on freshwater fish believes there may be hope for restoring native salmon to abundance – but there’s a catch: California must build the controversial Delta tunnels, he says. “The expected costs are tremendous and there is a lot of concern over that, but our paper is about what’s good for fish,” said Peter Moyle, a professor of fisheries with the University of California, Davis Center for Watershed Sciences. “Will the Delta tunnels be good for fish or not? I think they will.”