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The Blog Aquatic

News, opinions, photos and facts from Ocean Conservancy

BP Oil Marring Deep-Water Corals 13 Miles Out

Posted On July 31, 2014 by

Photo: Fisher lab, Penn State University

Deep-water corals keep good records, which come in handy in the case of the BP Deepwater Horizon oil disaster. Researchers from Penn State University discovered this week that the impact of the BP oil disaster on corals living in the cold waters at the Gulf of Mexico seafloor is bigger than predicted.

This study joins dozens of others on fish, dolphins and birds as part of the ongoing Natural Resource Damage Assessment, a legal process that’s critical for tracking the damage that started four years ago at the bottom of the Gulf. Scientists first discovered corals coated in a brown substance only 7 miles from the now-defunct BP well in late 2010. The oil left over from the disaster is more difficult to find in the deep sea (in contrast to the coastline, where the occasional 1,000-pound tar mat washes up on shore), so scientists must look to corals for clues on how the marine environment was impacted. “One of the keys to coral’s usefulness as an indicator species is that the coral skeleton retains evidence of the damage long after the oil that caused the damage is gone,” said lead researcher Charles Fisher.

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Fishermen and Scientists Work Together to Track Sick Fish

Posted On July 21, 2014 by

University of South Florida Professor Steven Murawski began studying diseases in fin fishes after the 2010 Deepwater Horizon oil spill when Gulf of Mexico fishermen began reporting a surge in fish with visible lesions. Credit: C-Image. Caption from phys.org

Fishermen are on the water every day, which means they are often the first to notice when something changes. After the BP Deepwater Horizon oil disaster, we heard reports from fishermen that they were catching more fish with lesions than they had ever seen before. Immediately after hearing these reports, Dr. Jim Cowan at LSU began investigating the frequency, location and cause of the reported lesions. Many other scientists have collected data on this same issue, and last week a group from the University of South Florida published the first round of results in a scientific journal.

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A Victory for Gulf Sea Turtles

Posted On July 14, 2014 by

Blair Witherington

Last September, we asked you to help us protect the Gulf’s sea turtles and today, I have some wonderful news to share. Thanks to more than 5,000 of our supporters, 685 miles of beaches and nearly 200,000 square miles of the Atlantic Ocean and Gulf of Mexico have now been declared critical habitat for threatened loggerhead sea turtles. The newly protected areas include floating Sargassum mats, where young sea turtles live and grow.

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Troubling News for Mahi-mahi in the Gulf

Posted On June 20, 2014 by

Photo: Kelly the Deluded via Flickr Creative Commons

As we watched the BP Deepwater Horizon oil disaster unfold on beaches and in bays of the Gulf of Mexico four years ago, we wondered, too, about the impacts beyond what we could see on shore. Some of the answers to that troubling question are rolling in. We previously learned about damage to fish embryos, and the latest news involves mahi-mahi, or dolphinfish. These fast-growing, colorful predators are a favorite target of recreational fishermen and restaurant-goers alike across the Gulf, and despite their savage speed, it seems they could not outrun the impacts of BP’s oil.

A new study from the University of Miami last week demonstrated that even “relatively brief, low-level exposure to oil harms the swimming capabilities of mahi-mahi, and likely other large pelagic fish, during the early life stages.” And while it’s troubling to hear that oil reduces the fish’s ability to swim fast – a necessity for finding food and evading predators –the more disturbing revelation is how little oil exposure it takes to cause this damage to such an economically important fish.

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800,000 and Counting: The Soaring Deepwater Horizon Bird Death Count

Posted On May 22, 2014 by


According to a new study, scientists estimate that between 600,000 and 800,000 coastal seabirds died because of the BP Deepwater Horizon oil disaster, a number far greater than any previous estimate. Understanding the ripple effect of 800,000 coastal birds dying in the Gulf of Mexico is critical to the recovery of this special place. These findings come from a study to be released this summer in Marine Ecology Progress Series, which was recently reported in the New York Times.

This new estimate for bird deaths in the Gulf is unprecedented for an oil disaster. For context, the estimate of dead birds following the Exxon Valdez Oil Spill was around 300,000.

What are the ecosystem effects of 800,000 birds dying?

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Interview with Marine Mammal Researcher Dr. Ruth H. Carmichael on the Stranding of Dolphins, Manatees and Whales

Posted On April 15, 2014 by

This blog is part of a series of interviews with scientists who are championing marine research in the Gulf of Mexico.

We know there was a very significant increase in the number of marine mammal strandings observed following the BP Deepwater Horizon oil disaster. Dr. Ruth H. Carmichael talks to Ocean Conservancy about her work to respond to strandings when they occur, collect data to better understand these strandings and put together public outreach programs to prevent them in the future.

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Potential Threats from BP Oil to Bluefin and Yellowfin Tuna, Swordfish and Amberjack

Posted On April 8, 2014 by

© Cheryl Gerber

A new study published last month reveals how the 2010 BP Deepwater Horizon oil disaster likely caused life-threatening heart deformities and irregular function in the fish embryos of yellowfin tuna, bluefin tuna, amberjack and swordfish.

If you’re thinking that this sounds like another study we reported on last month, then you’re right. A number of different studies have been conducted on fish hearts, and each of them is an important piece of the puzzle that scientists are assembling to understand the impacts of the BP Deepwater Horizon oil disaster.

This latest study conducted by Dr. John Incardona and others clarifies how the oil from the BP oil disaster affects the embryos of large predatory fish living in the open ocean (or pelagic zone) of the Gulf of Mexico. Previous studies have determined that crude oil can be toxic or have delayed fatal effects on fish living in cold Arctic waters, such as pink salmon, or in warm freshwaters, such as zebrafish. We’ve also recently learned that Gulf killifish living in oiled areas of coastal Louisiana are suffering from deformed hearts and reduced chances of survival; another study helped us better understood the mechanism by which crude oil affects tuna hearts. Collectively, this research allowed scientists to make assumptions about how oil might affect fish living in the warm offshore waters of the Gulf.

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