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Washington • The Environmental Protection Agency unveiled new standards Monday aimed at reducing the billions of fish, crab and shrimp killed by cooling water systems at power plants and factories each year.

The regulations will force more than 1,000 power plants and factories that withdraw at least 2 million gallons of water a day from adjacent waterways for cooling to take steps to minimize its toll on aquatic wildlife. Marine animals, many of them juvenile, die by either being pinned or by being exposed to heat, chemicals and other stress after they are sucked inside the system. The EPA estimates 2.1 billion fish, crab and shrimp die annually.

"EPA is making it clear that if you have cooling water intakes, you have to look at the impact on aquatic life in local waterways and take steps to minimize that impact," said Nancy Stoner, the EPA's acting assistant administrator for water, in a statement.

The rule is among a series issued by the Obama administration targeting various forms of air and water pollution from the nation's power plants, particularly coal-fired facilities. Coal-burning power plants already face limits on mercury and toxic air pollution, and will for the first time be the target of a new proposal in June to regulate the gases blamed for global warming. Republicans in Congress immediately painted the regulation as another attack on the nation's power producers. Sen. James Inhofe, R-Okla., vowed to work to get a vote to repeal it. But any such effort is likely to be vetoed by President Barack Obama.

"The EPA has released another rule that threatens the affordability and reliability of America's electricity, and I am committed to ensuring that Congress weighs in," Inhofe said.