BUCHANAN, N.Y. — For a striped bass in the Hudson River, a clutch of trout eggs in Lake Michigan or a salmon in San Francisco Bay, drifting a little too close to a power plant spells death. Sucked in with enormous volumes of water, battered against the sides of pipes and heated by steam, the small fry of the aquatic world are being sacrificed to the cooling systems of power plants around the country. Environmentalists say the killing is needless, but energy-industry officials say opponents of nuclear power exaggerate the losses. The issue is being debated at an Indian Point...