Showing posts with label Gulf of Mexico. Show all posts
Showing posts with label Gulf of Mexico. Show all posts

Friday, May 18, 2012

Lake Pontchartrain Facts

From Save Our Lake's website , some little known facts about Lake Pontchartrain.


Lake Pontchartrain is swimmable again. It was removed from the EPA's impaired waterbodies' list in 2006.

Lake Pontchartrain is not a lake, surrounded by land. It is an estuary, open to the Gulf of Mexico.



Lake Pontchartrain contains brackish water, a mix of saltwater from the Gulf and fresh water from rain and rivers. You can find both saltwater and freshwater fish in it.

Lake Pontchartrain has tides that come in and out from the Gulf of Mexico.

Lake Pontchartrain is fed directly by two rivers: Tangipahoa River and Tchefuncte River.



Lake Pontchartrain is 630 square miles in area and is approximately 25 miles across north to south.



Lake Pontchartrain is shallow, averaging only 12-15 feet deep.

Lake Pontchartrain has three beautiful beaches open to the public: Pontchartrain Beach on the South Shore, and Fontainebleau State Park beach on the North Shore.




Lake Pontchartrain has great fishing opportunities with 11 artificial reefs attracting fish.

Lake Pontchartrain has shrimp, crabs, clams, sharks, dolphins and manatees visiting in its waters. Keep an eye out and you may see some.






Tuesday, June 21, 2011

The Struggles of the Louisiana Oyster

 

from: Louisiana Seafood Board Newsroom

 

After Season of Flooding, Louisiana Oysters Struggle for Long-Term Survival

Posted: 20 Jun 2011 06:01 AM PDT

bloggers 24 550x366 After Season of Flooding, Louisiana Oysters Struggle for Long Term Survival

Fresh Louisiana oysters in Hopedale

By Veronica Del Bianco and Alice Bumgarner

This spring the Mississippi River made headlines as the river reached historic crest levels. By way of natural and manmade channels, freshwater gushed into Louisiana estuaries, threatening the lives of productive Louisiana oyster beds.

But does the freshwater threaten oysters' long-term survival as a species? Despite a bad prognosis for some oysters, seafood industry leaders explain that harvesting grounds are vast and oysters continue to be sustainably harvested, which bodes well for the long term.

"We could see 100 percent mortality in some of these areas," biologist Patrick Banks told the Times-Picayune, referring to the estuaries and coastal waters of Louisiana.

Banks is in charge of the oyster program for the Louisiana Department of Wildlife and Fisheries (LDWF). He tells the Times-Picayune that every time freshwater has been pushed into the estuaries, the impact is different, depending on the quantity of freshwater and at what stage of the oysters' life cycle it arrives.

In this case, the quantity is significant. At the height of the Mississippi River flooding, the Morganza Spillway discharged 114,000 cubic feet per second for five days. That's in addition to the Bonnet Carre Spillway, which since May 18 has had 330 of its 350 bays open.

Freshwater: Friend or Foe?

To understand why the extra freshwater threatens to have such a negative impact on the humble oyster, one must take a brief lesson in the biology of the mollusk.

bloggers 27 380x253 After Season of Flooding, Louisiana Oysters Struggle for Long Term Survival

Oysterman Anthony Slavich unloads a catch of oysters in Hopedale.

Oyster blood needs to stay in "osmotic equilibrium," explains Dr. Bryan P. Piazza of The Nature Conservancy. When the water trying to enter an oyster has a lower salinity than what's inside, the mollusk literally tries to "clam up" in order to maintain its delicate balance, constricting its valve or even shutting its shell tight.

If this occurs, the oyster can't filter water or feed effectively, and gas exchange is compromised. Basically, the oyster starves.

Making survival more difficult is the fact that, in this case, the arrival of freshwater coincided with the higher temperatures of summer. When temperatures are high, oysters need to feed more than usual. If they've clammed up to maintain equilibrium, they can starve at an even faster rate.

Piazza underscores that oysters do need some freshwater. "Freshwater is not the enemy," he says.

Floods from the freshwater rivers are what helped Louisiana's rich oyster beds develop in the first place, says Banks. Floods are a natural part of the cycle.

Unlike other species with mobility, however, oysters can't move when their environment becomes too extreme for survival.

2 Million Acres of Reefs to Work With

Banks's and Piazza's prognosis may sound doomsday-ish, until you remember that Louisiana has around two million acres of oyster-harvesting grounds to work with.

"Our harvest will be reduced some because of the floods, but two million acres of oyster-harvesting grounds in Louisiana will be able to provide oysters for buyers, without any risk of overfishing," says Greg Voisin, director of marketing and sales for oyster-processing company Motivatit Seafoods.

Tasked with ensuring that oysters aren't overfished, the Louisiana Department of Wildlife and Fisheries and the state's Department of Natural Resources regularly sample and monitor the 1.5 acres of oyster reefs owned by the state.

"They've closed areas when they've felt like they needed to be closed for spawning," says Voisin.

The other half-million acres of oyster reefs are privately owned and are neither monitored nor certified by the state. Even so, says Voisin, the economics of oyster harvesting practically ensure that the reefs are sustainably harvested.

Harvesting With Sustainability in Mind

Oysters are typically left in the water until they're at least three inches long, he explains, because there's no market for them. That means the younger oysters are left intact. That gives them time to reach the age of spawning, which occurs twice a year, when the water drops to 70 degrees.

"If you brought two-inch oysters into a shucking house, they'd tell you to turn your truck around," says Voisin. Oysters that small are "almost humanly impossible" to open. Besides, he says, shuckers get paid by the sack. Why shuck 600 small oysters when you could shuck 280 big ones for the same pay?

People may have the impression that, after the natural and manmade disasters of the past few years, oyster beds are being perilously overfished. But that isn't the case, he says.

Each oyster of spawning age can lay up to one million eggs a year. "We obviously don't get 100 percent of that yield," he says. "If they spawn even three percent of that, we have more oysters than we know what to do with."

As the seventh generation of Voisins to work in Louisiana's seafood industry, Greg puts a premium on managing the coast's natural resources wisely. After Hurricane Katrina, he and other seafood industry workers spent countless hours pulling away trash from the reefs that the turbulent ocean had washed up.

"If we don't have healthy reefs, we go out of business," he says. "We're the biggest environmentalists out there."

 

 

Tuesday, April 19, 2011

One year later - BP Oilspill

84 bills were introduced in Congress related to the BP oilspill. Two passed the house. None passed the Senate. None

from PewEnvironment.org/OffshoreEnergyReform

Total barrels of oil spilled into the Gulf of Mexico by the Deepwater Horizon blowout: 4,900,000

Equivalent of that in Exxon Valdez oil spills: 19

Barrels of oil per day BP claimed in its 2009 emergency response plan it could
skim and store in response to a spill in the Gulf: 491,721

Average barrels per day BP actually captured, burned and chemically “dispersed”: 19,251

Gallons of chemical dispersant dumped into the Gulf to try to break down the oil: 1,843,786

Projected three-year loss of tourism revenue for Gulf Coast communities as a result of the spill: $22,700,000,000

Number of active offshore oil platforms in the Gulf: 3,395

Number of them in deepwater (more than 1,000 feet): 64

Underwater depth of the Deepwater Horizon well, in feet: 4,994

Number of Gulf oil platforms in water deeper than that: 11


Underwater depth of the deepest of those, in feet: 8,062
Number of U.S. offshore oil well “incidents” (including fatalities, injuries, fires, and spills)

reported by federal regulators from 2006 through 2009: 3,282

Number of those that included “a loss of well control”: 23

Ratio of government inspectors to oil platforms in the Gulf of Mexico: 1 to 54

Percentage of those inspectors who believe they did not receive adequate training: 50

Percent of increase in U.S. offshore oil and gas leasing since 1982: 200

Percent of decrease in staffing resources for federal offshore regulation since 1983: 36

Number of bills introduced in Congress since the Deepwater Horizon blowout that
would reform offshore drilling and/or improve spill response: 84

Number of those bills that have passed the House: 2

Number that have passed the Senate: 0

Figures are the most recently available as of October 26, 2010. Sources at this link

SOMEBODY STOP THIS

 wearing sunglasses inside and following an event where he at times had a hard time speaking coherently, Elon Musk walks off the CPAC stage ...