NEW ORLEANS – At the same time they are venting their fury on BP over the Gulf of Mexico spill and its calamitous environmental effects, Louisiana politicians are rushing to the defense of the oil-and-gas industry and pleading with Washington to bring back offshore drilling — now.

As angry as they are over the disaster, state officials warn that the Obama administration’s temporary ban on drilling in the Gulf has sent Louisiana’s most lucrative industry into a death spiral.

They contend that drilling is safe overall and that the moratorium is a knee-jerk reaction, akin to grounding every airplane in America because of a single crash. They worry, too, that the moratorium comes at a time when another major Louisiana industry — fishing — has been brought to a standstill by the mess in the Gulf.

“Mr. President, you were looking for someone’s butt to kick. You’re kicking ours,” La Fourche Parish President Charlotte Randolph said in pleading for the moratorium to end.

The oil-and-gas industry is the backbone of the Louisiana economy, bringing in billions of dollars in revenue for the government and accounting for nearly one-third of the nation’s domestic crude production.

It took a heavy blow when the government imposed a six-month offshore drilling moratorium in the wake of the spill that has sent tens of millions of gallons of oil into the Gulf in the biggest environmental disaster in U.S. history. The government imposed the ban while it reviews the safety of deepwater drilling in light of the BP disaster.

Louisiana lawmakers have railed against the moratorium, saying it could put more than 100,000 people out of work, shutter businesses and destroy livelihoods. A bill asking the administration to shorten the moratorium passed the Legislature unanimously.

But persuading the administration to take such action could prove to be extraordinarily difficult at a time when globs of oil are fouling marshes and beaches, images of oil-soaked birds are a fixture in the news and no apparent end to the spill is in sight.

Interior Secretary Ken Salazar has acknowledged the potential damage to energy companies and their employees and promised a Louisiana senator the administration would demand that BP compensate businesses for their losses.

The moratorium put a halt to the 33 deepwater exploratory rigs in operation in the Gulf in addition to all new deep-sea drilling permits. Platforms that are already producing oil along with rigs in shallow waters are allowed to remain in operation.

“Every one of these deepwater wells employs directly hundreds of people and indirectly thousands,” said Sen. Mary Landrieu of Louisiana. “This is one company. This is one well. It’s a terrible situation and no one is making light of it, but what I’m saying, as strongly as I can, to this president is the economic analysis is devastating to many companies, thousands of companies.”

Trade groups estimate that the 33 deepwater rigs idled by the moratorium employed 5,900 to 9,200 people. Rig workers earn up to $1,800 per week, so that amounts to a loss of tens of millions dollars in salaries. In addition, those jobs support an additional 26,000 to 46,000 industry workers.

“It’s going to put us out of business,” said Glenn LeCompte, owner of a Louisiana catering company that provides food to offshore rigs. “My payroll probably runs about $150,000 a week. That payroll is going to disappear.”

Gulf communities already are seeing the livelihoods of thousands of fisherman, property owners and tourism workers jeopardized by the spill. Fishing and tourism contribute $10 billion to Louisiana’s $210 billion economy, while energy contributes $65 billion.

“Those two things, fishing and oil, coexist together and form a way of life down here,” said Jefferson Parish Council Chairman John Young.

The Energy Department estimates that 25 million barrels of oil production will be lost in 2011 because of the six-month moratorium. That’s less than what the country burns in two days, but production will drop even more if the ban is extended to a year or more, as a number of analysts expect.