* Part of spill in "Loop Current," may spread far wider
* BP says it is trapping more oil from leaking well
* BP shares down nearly 2 percent in London (Recasts, adds heavy oil in Louisiana marshlands)
By Matthew Bigg
VENICE, La., May 19 (Reuters) - The first heavy oil from a giant Gulf of Mexico spill sloshed ashore in fragile Louisiana marshlands on Wednesday and part of the mess entered a powerful current that could carry it to Florida and beyond.
The developments underscored the gravity of the situation as British energy giant BP (BP.L) Plc raced to capture more crude gushing from a ruptured well a mile (1.6 km) beneath the surface. The spill is threatening an ecological and economic disaster along the U.S. Gulf Coast and beyond.
"This wasn't tar balls. This wasn't sheen," Louisiana Governor Bobby Jindal said after a boat tour to the southernmost point of the Mississippi River estuary. "This is heavy oil in our wetlands."
The marshes are the nurseries for shrimp, oysters, crabs and fish that make Louisiana the leading producer of commercial seafood in the continental United States and a top destination for recreational anglers. The United States has already imposed a large no-fishing zone in waters in the Gulf seen affected by the spill. [ID:nN18155760] <^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ TAKE A LOOK on the spill [ID:nSPILL] INSIDER TV: link.reuters.com/wuw64k Graphic: link.reuters.com/ken64k Breakingviews column [ID:nLDE64C1D1] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^>
Meanwhile, the U.S. government's top weather forecaster said a "small portion" of light sheen from the giant oil slick has already entered the Loop Current, which could carry the oil down to the Florida Keys, to Cuba and even up the U.S. East Coast.
BP, its reputation on the line in an environmental disaster that could eclipse the 1989 Exxon Valdez spill in Alaska, has marked some progress at siphoning some of the oil from the well, which ruptured after an April 20 explosion of the Deepwater Horizon rig that killed 11 workers.
BP said it is now siphoning about 3,000 barrels (126,000 gallons/477,000 liters) a day of oil, out of what the company estimated was a 5,000 barrels (210,000 gallons/795,000 liters) a day gusher. And BP could begin injecting mud into the well as early as Sunday in a bid to permanently plug the leak.
'NOT ROCKET SCIENCE'
A U.S. congressional panel heard testimony from experts who said the spill rate could be many-fold larger.
"This is not rocket science," said Steve Wereley, associate mechanical engineering professor at Purdue University, who pegged the spill's volume at about 70,000 barrels per day. "All outside estimates are considerably higher than BP's."
The development may still be welcome news for the company and its battered share price. BP shares closed down nearly 2 percent in London on Wednesday, extending recent steep losses.
The political fall-out also continues. The U.S. Interior Department said on Wednesday its embattled Minerals Management Service will be broken up into three separate divisions, as part of an effort to restructure the way the department handles offshore energy production. [ID:nN19223644]
Florida's tourism gained a respite when tar balls found on Keys beaches were shown not to come from the Gulf of Mexico oil leak, but officials said the $60 billion-a-year industry was already taking a beating from the month-old spill.
To the relief of Florida officials, the Coast Guard said laboratory tests had shown that 50 tar balls found this week on the Lower Keys -- a mecca for divers, snorkelers, fishermen and beach goers -- were not from the Gulf spill.
Local tourism authorities said damage had already been inflicted by the negative publicity linked to the spill.
"Even if we don't get even a gumball-sized tar ball down here in the next month, there has already been significant perception damage to Florida Keys and Florida tourism," said Andy Newman of the Monroe Tourism Development Council.
"We understand we are not out of the woods yet, that there's more oil out there," he said.
Tar balls have also been found on the Texas coast and were being tested but a Coast Guard official said it was "highly unlikely those tar balls in Texas are related to this spill."
The spill has also prompted rare talks between U.S. and Cuban officials in Havana, with forecasters predicting that oil could reach Cuban shores. [ID:nN19218031]
CRIME SCENE
Wildlife and environmental groups accused BP of holding back information on the real size and impact of the growing slick, and urged President Barack Obama to order a more direct federal government role in the spill response.
In prepared testimony for a congressional committee, National Wildlife Federation President Larry Schweiger said BP had failed to disclose results from its tests of chemical dispersants used on the spill. He also said it had tried to withhold video showing the true magnitude of the leak.
"The federal government should immediately take over all environmental monitoring, testing and public safety protection from BP," he said. "The Gulf of Mexico is a crime scene and the perpetrator cannot be left in charge of assessing the damage."
The Washington-based Center for American Progress published comments by its health experts Lesley Russell and Ellen-Marie Whelan saying the huge spill, and the dispersants being used against it, posed "insidious and unknown" human risks.
Noting the federal government had allowed BP to test the undersea use of dispersants, they added, "But are we letting the fox guard the hen house by letting the oil companies determine the safety of these cleaning agents?"
The spill has forced Obama to put a hold on plans to expand offshore oil drilling and has raised concerns about planned oil operations in other areas like the Arctic. [ID:nN19224303] (Additional reporting by Deborah Zabarenko in Washington, Jane Sutton and Pascal Fletcher in Miami, Matthew Bigg in Louisiana, and Anna Driver, Chris Baltimore and Jeff Mason in Houston; Writing by Ed Stoddard and Pascal Fletcher; Editing by Todd Eastham)
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