Saving Seafood

Is it safe to eat seafood in the Tampa Bay area during Red Tide?

July 16, 2021 — With no end in sight for the Red Tide algal blooms currently plaguing the Tampa Bay area, questions have surfaced concerning the safety of the region’s locally sourced seafood. We spoke with several food safety and marine biology experts about what consumers should know before dining out and how best to avoid fish and seafood that may be contaminated.

Is it safe to eat local seafood during Red Tide?

The short answer is yes. Most of the local seafood sold at markets and restaurants in the Tampa Bay area is fished offshore in the Gulf of Mexico, and the industry is heavily regulated and monitored for safety. Florida grouper and snapper are all fished in areas far offshore nowhere near the coastal algal blooms plaguing the region, said Dr. Steve Murawski, a professor of fishery biology at the University of South Florida’s College of Marine Science.

“Generally, the major seafood components are offshore,” Murawski said. “This particular Red Tide is really restricted to the very near-shore area from north of Port Charlotte up to Pasco County, and in terms of sourcing traditional grouper, snapper, scallops … they wouldn’t be affected by this.”

According to the Florida Fish and Wildlife Conservation Commission, storebought seafood and seafood served at local restaurants can be considered safe to eat because it’s been monitored and tested prior to distribution.

Read the full story at The Tampa Bay Times

Study finds significant liver damage in Gulf of Mexico red snapper

March 17, 2021 — A study completed by researchers from the University of South Florida has revealed almost every red snapper studied in the Gulf of Mexico in the wake of the Deepwater Horizon spill showed signs of liver damage.

Red snapper is the latest Gulf species studied by researchers at the USF College of Marine Science in the wake of the devastating 2010 oil spill. Erin Pulster, a USF researcher and lead author of the study, said the results give “early warning signs of a compromised ecosystem.” Pulster and her team recently had their findings published in Aquatic Toxicology.

Read the full story at Seafood Source

Red Snapper in the Gulf show signs of stress after Gulf oil spill

March 12, 2021 — Nearly 100 percent of the red snapper sampled in the Gulf of Mexico over a six-year period by University of South Florida (USF) marine scientists showed evidence of liver damage, according to a study reported in Aquatic Toxicology.

The study is the first to correlate the concentration of crude oil found in the workhorses of the digestive system — the liver, gall bladder, and bile — with microscopic indicators of disease, such as inflammation, degenerative lesions, and the presence of parasites. The team sampled nearly 570 fish from 72 Gulf locations between 2011 to 2017 in the wake of the historic 2010 Deepwater Horizon oil spill.

“The results add to the list of other species we’ve analyzed indicating early warning signs of a compromised ecosystem,” said Erin Pulster, PhD, first author of the study and researcher at the USF College of Marine Science.

Pulster and the team of researchers studying oil pollution in Gulf of Mexico fishes have previously reported high levels of oil exposure in yellowfin tuna, golden tilefish, and red drum as well.

The Gulf of Mexico not only experiences hundreds of annual oil spills with long-lasting effects such as the historic Deepwater Horizon spill in 2010 but is routinely subject to intense shipping traffic and collects pollutants from faraway places that flow in from coastlines and rivers like the Mighty Mississippi and the Rio Grande.

In this study Pulster and the team looked specifically at the most toxic component of crude oil called polycyclic aromatic compounds, or PAHs. PAH sources include old oil and gas rigs, fuel from boats and airplanes, and natural oil seeps, which are fractures on the seafloor that can add millions of barrels of oil to the Gulf every year.

Read the full story at Science Daily

Red Snapper in the Gulf show signs of stress

March 11, 2021 — Nearly 100 percent of the red snapper sampled in the Gulf of Mexico over a six-year period by University of South Florida (USF) marine scientists showed evidence of liver damage, according to a study reported in Aquatic Toxicology.

The study is the first to correlate the concentration of crude oil found in the workhorses of the digestive system—the liver, gall bladder, and bile—with microscopic indicators of disease, such as inflammation, degenerative lesions, and the presence of parasites. The team sampled nearly 570 fish from 72 Gulf locations between 2011 to 2017 in the wake of the historic 2010 Deepwater Horizon oil spill.

“The results add to the list of other species we’ve analyzed indicating early warning signs of a compromised ecosystem,” said Erin Pulster, Ph.D., first author of the study and researcher at the USF College of Marine Science.

Pulster and the team of researchers studying  in Gulf of Mexico fishes have previously reported high levels of oil exposure in yellowfin tuna, golden tilefish, and red drum as well.

Read the full story at PHYS.org

10 years after the Deepwater Horizon oil spill, oil pollution found in thousands of fish, study says

April 21, 2020 — Oil pollution has been detected in thousands of fish in the Gulf of Mexico, including higher levels in popular seafood choices like yellowfin tuna, tilefish and red drum, according to a new study.

The research was carried out between 2011 and 2018, sampling more than 2,500 individual fish that belonged to 91 species living in 359 different locations in the Gulf. All of them contained oil exposure.

When the Deepwater Horizon explosion occurred 10 years ago, millions of gallons of oil spewed into the Gulf of Mexico’s waters over 87 days. The BP oil spill became the largest accidental oil spill in US history.

After the explosion, researchers, like those at the University of South Florida, raced to study the spill and its environmental effects in real time.

Weeks later, BP made a 10-year, $500 million commitment to fund research. While the funding comes to a close this year, research done over the last 10 years is being released.

Read the full story at CNN

USF researchers sampled more than 2,000 fish in the Gulf of Mexico. They found oil pollution in every one.

April 16, 2020 — In the decade since the Deepwater Horizon oil spill, researchers from the University of South Florida have circled the Gulf of Mexico, catching fish and cutting them open in search of toxic pollution.

They found that the gulf is a “greasy place,” said Steve Murawski, a USF fisheries biologist. All of the 2,503 fish they studied showed traces of oil exposure, not to the level of being unsafe to eat but enough to raise questions about species’ long-term health, according to the study just published in Nature Scientific Reports.

The scientists looked for evidence of toxic hydrocarbons — compounds found in crude oil — and did not connect their results to the disaster specifically. Oil leaks into the gulf for many reasons, from natural seeps to river runoff and boating discharges. That makes it nearly impossible to track pollution in fish to a specific cause. But some findings suggest the spill had an effect, Murawski said.

Read the full story at the Tampa Bay Times

Florida researchers team to map entire Florida coast, wildlife habitats

July 24, 2018 — The USF College of Marine Science is teaming up with the Florida Institute of Oceanography to map the entire Florida coast, as well as gather data on fish spawning areas in the state’s coastal waters.

  • Researchers developing maps of essential sealife habitats
  • Florida Coastal Mapping Program capturing high resolution maps of coast
  • Less than 20 percent of Florida’s coastal waters have been mapped

Researchers from the two schools are pushing forward a number of projects while working onboard the Weatherbird II research vessel in the Gulf of Mexico.

One of those projects involved gathering HD video of the sea bottom to count the number of Red Snapper in the gulf utilizing an instrument called a “C-BASS.” The Weatherbird tows the C-BASS about six feet off the bottom of the ocean floor and utilizes lights and cameras to capture all the action.

It’s all part of the C-SCAMP project, which is also developing high-resolution multibeam maps to identify essential habitats on the West Florida shelf.

“It’s really important not only for just finding out what’s there, but also for the management of our natural resources,” said USF Professor Steve Murawski. “So, we’re trying to close this huge gap in terms of our understanding of what’s on the sea floor and how valuable it is.”

Read the full story at Spectrum News 13

Map Of Gulf Of Mexico Fisheries Prepares For Future Disasters

July 10, 2018 — A study seven years in the making by University of South Florida researchers has created a map of how many species live in the Gulf of Mexico. This will give experts an idea of how much damage would take place from a future oil spill.

The study took so long to complete because 12 separate expeditions were needed to cover the entire Gulf, including the waters off Mexico and Cuba. USF biologist and professor Steve Murawski said this information will be priceless.

“One of the criticisms of the Deepwater Horizon episode is before the spill, we had no environmental baseline for many of the things that are of interest and importance, and understanding the environment,” he said, “and now we have that baseline.”

Surprisingly, Murawski said researchers didn’t see a significant dropoff in the numbers of fish around the oil spill site, except for red snapper and hake.

Read the full story at WLRN

USF-led study discovers what lives in the gulf after BP disaster

July 6, 2018 — Eight years ago, when the Deepwater Horizon rig exploded and sank off Louisiana, one of the big problems facing scientists trying to assess the damage caused by the oil spill was that no one knew much about what lives in the Gulf of Mexico.

That’s no longer a problem, according to the University of South Florida’s College of Marine Sciences.

Partially funded by money that BP had to pay in the wake of the 2010 disaster, USF scientists joined with colleagues from three other universities to put together the first-ever comprehensive look at what fish and other wildlife call the gulf their home.

Compiling the data for their study, just published in the scientific journal Marine and Coastal Fisheries, required 12 separate voyages over seven years on the USF research ship R/V Weatherbird II. That included two trips to Mexico and one to Cuba, according to lead research scientist Steve Murawski of USF.

During those voyages the scientists caught 15,000 fish of 166 species from 343 locations. They tested the specimens for oil residues and other pollutants. Overall, the degree of oil contamination of fish from the northern gulf continues to decline, the report said, but none of the areas assessed so far have been free of oil.

One surprise in their findings, Murawski said, was that the part of the gulf with the lowest diversity of fish species is the area of the gulf with the greatest number of offshore oil rigs.

“They’ve had 50 to 60 years of oil development there,” he said. “So that may be one of the at-risk areas” in case of a future oil spill. A disaster like Deepwater Horizon could more easily wipe out the fish living there to the point where they could not bounce back, he explained.

Read the full story at the Tampa Bay Times

University of South Florida to study how commercial fishermen were affected economically by BP oil spill

December 27, 2016 — ST. PETERSBURG, Fla. — Six years ago, when the Deepwater Horizon disaster forced the federal government to close off vast tracts of the Gulf of Mexico to fishing, some commercial fisherman weighed anchor and tried their luck elsewhere. Others quit fishing to work for BP on the cleanup.

But exactly how many did which, and what impact that had on their finances, has never been gauged.

Now, thanks to a $1 million grant, marine scientists from the University of South Florida, the University of Miami and University of California will try to figure that out. They will examine data that they expect will help them understand how the oil spill affected fishermen economically.

The researchers hope to learn how many tried a new fishing area and how many worked on the cleanup, and which paid better.

The grant from the National Academies of Science would then allow them to create a computer model to calculate how future oil spills might hurt the fishing industry in other areas, said Steve Murawski, a USF fisheries biologist who has overseen numerous projects related to the 2010 Deepwater Horizon disaster.

“Say five years from now there’s a proposal for drilling off Florida,” Murawski said. “We could make a projection that if there’s a spill, what would be the impact on the counties there.”

The Deepwater Horizon disaster began in April 2010 with an explosion that killed 11 crew members. The rig sank 5,000 feet to the bottom of the gulf and began gushing oil.

Because the leak happened so far from the surface, BP could not immediately shut it off. Underwater robots sent down to monitor the spill broadcast live footage of the oil gushing from the rig, footage shown around the world.

Read the full story at the Tampa Bay Times