Saving Seafood

New study reveals hidden ocean chemistry

April 8, 2026 — Scientists have found a new way to detect subtle chemical signatures in seawater—revealing previously invisible details about the ocean’s chemistry from data continuously collected by thousands of autonomous robotic floats drifting across the seas.

A University of Miami Rosenstiel School for Marine, Atmospheric, and Earth Science-led research team applied a new approach they developed to detect subtle chemical signatures in seawater, revealing that nitrogen cycling in parts of the ocean with very little oxygen, known as oxygen-deficient zones, is far more dynamic than previously thought.

“Understanding when and where nitrogen loss occurs is critical because it governs ocean productivity, the global carbon cycle, and even atmospheric greenhouse gas balance.” said the study’s lead author Mariana Bif, an assistant professor in the Department of Ocean Sciences at the Rosenstiel School.

Using the new method, the team extracted previously unresolved chemical signals in seawater—specifically nitrite and thiosulfate—from ultraviolet (UV) spectra collected by nitrate sensors on Biogeochemical-Argo (BGC-Argo) floats. This approach enables the detection of these key intermediates molecules from datasets originally developed to detect only nitrate.

The float recorded vertical profiles of oxygen, nitrate, pH, and bio-optical properties about every ten days in waters of the Eastern Tropical North Pacific. By reconstructing nitrite concentrations from the UV spectra and combining them with the other measurements in a biochemical model, the researchers were able to resolve how nitrogen cycling pathways varied over time and depth. The model also enabled quantification of the relative contributions of different microbial processes in low-oxygen waters.

Read the full article at University of Miami

Severe U.S. drought undermined Gulf fisheries, raising food security concerns

March 18, 2026 — A severe and prolonged U.S. drought in the late 1980s played a central role in one of the largest fisheries declines ever recorded in the Gulf of Mexico, according to a new study published in Nature Communications.

The research, led by scientists at the University of Haifa and co-authored by Ben Kirtman, a climate scientist and dean of the University of Miami Rosenstiel School of Marine, Atmospheric and Earth Science, found that drought-driven reductions in Mississippi River flow sharply limited nutrient delivery to coastal waters.

“Our findings show that the fisheries collapse was not driven by fishing pressure alone,” said Igal Berenshtein, head of the Marine Ecology and Ocean Health Laboratory at the University of Haifa, and the study’s lead author. “The prolonged drought reduced river discharge and nutrient input to the Gulf, weakening phytoplankton production and primary productivity at the base of the food web. That disruption cascaded through the ecosystem, ultimately reducing fish biomass and fisheries yields.”

The study documented a roughly 42 percent drop in total fish biomass and a 34 percent decline in fisheries catch following the drought period. Nearly 90 percent of species groups examined showed decreases in biomass.

Read the full article at The University of Miami

Study suggests wind power development would have little impact on Gulf shrimping

December 5, 2025 — A study from the University of Miami found that the installation of wind power infrastructure in the Gulf of Mexico, currently referred to as the Gulf of America by the U.S. government, is unlikely to impact commercial shrimping operations.

The development of offshore wind projects in the United States has been contentious for much of the commercial fishing industry, with fishers claiming turbines in the ocean block them from accessing valued fishing grounds and disrupt the ecosystem. Wind turbines have also posed a problem for NOAA Fisheries, forcing the agency to reconsider how it conducts fisheries surveys as its traditional research vessels can’t navigate too close to the structures.

Read the full article at SeafoodSource

New study links red tides and dead zones off west coast of Florida

April 26, 2022 — A new study found that when red tides began in early summer and continued into the fall, low oxygen areas—or dead zones— were more likely to also occur. This study by scientists at the University of Miami Rosenstiel School of Marine and Atmospheric Science, and NOAA collaborators is the first study to link low oxygen—or hypoxia—to red tides across the west coast of Florida and offers new information to better understand the conditions favorable for combined events as they are expected to increase as Earth continues to warm.

Red tides are becoming a near annual occurrence off the west coast of Florida, which are caused by massive blooms of the algae Karenia brevis fueled in part by excess nutrients in the ocean. These  turn the  red and produce toxins that are harmful to marine mammals, sharks, seabirds and humans causing a range of issues from respiratory irritation, localized fish kills to large-scale massive mortalities to . Hypoxic areas are typically referred to as ‘dead zones’.

Read the full story at Phys.org

 

New research shows that 85% of coral reef fish studied are overfished

February 10, 2022 — A new study led by scientists at the University of Miami (UM) Rosenstiel School of Marine and Atmospheric Science has found concrete evidence that more than 85 percent of the grouper and snapper studied are overfished as a direct result of increasing human demand for seafood.

The research team analyzed 30 years of population data for 15 coral reef fish species central to South Florida’s commercial and  using their length-based risk analysis (LBRA) framework.

They found that three out of the five grouper species, all eight snapper species, and two grunts analyzed were below the 40 percent minimum spawning potential ratio, a regulation necessary to sustain fish populations.

Read the full story at Phys.org

 

Here’s why Miami shark researchers are concerned about a potential COVID-19 vaccine

October 28, 2020 — Science’s steady march to find a vaccine capable of ending the coronavirus pandemic may come at the expense of another species: sharks.

Miami shark researchers say they’re concerned about a key ingredient used to make vaccines more effective, squalene — an oily substance found in plants and even human skin — but is particularly concentrated in shark livers.

The practice of using shark-derived squalene as a booster to stimulate a stronger immune response to a vaccine is not unique to the coronavirus vaccine. The compound has been shown to be safe and effective in millions of doses of vaccines, primarily in Europe, said Liza Merly, a shark immunologist at the University of Miami’s Rosenstiel School of Marine and Atmospheric Science.

Read the full story at the Miami Herald

‘Invisible oil’ from 2010 Deepwater Horizon spill reached Florida Keys

February 18, 2020 —  Florida Keys residents may not have seen massive tar balls and fish kills after the 2010 Deepwater Horizon oil spill, but small concentrations of toxic crude were still reaching the islands and potentially harming marine life, as the extent of the deadly disaster in the Gulf of Mexico was worse than originally thought, according to a University of Miami study.

Nearly a decade after the worst offshore oil spill in U.S. history killed 11 people and dumped 200 million gallons of crude into the ocean, researchers found discrepancies in the satellite footprint that was used to establish fisheries closures and data from sampling and field tests. They concluded that the real extent of the BP oil spill may have been 30 percent larger than originally estimated. After methane seeped into the rig and triggered an explosion on April 20, 2010, oil gushed from a pipe more than 4,000 feet below the ocean’s surface for 87 days.

Looking at water and sediment measurements, oil transport models and satellite imagery, the team of researchers concluded that what appeared on the two-dimensional images provided by the National Environmental Satellite, Data and Information Service – areas that were determined to be contaminated and closed off to fishing – didn’t match what in-site data was showing.

Oil was flowing beyond the rig’s location off the coast of Louisiana toward the west, reaching the Texas shores, and to the other side toward the West Florida Shelf, the study said. It was also present in the Loop Current that carries water from the Gulf around the southern tip of Florida through the Keys and up toward Miami.

Read the full story at the Portland Press Herald

The toxic reach of Deepwater Horizon’s oil spill was much larger — and deadlier — than previous estimates, a new study says

February 13, 2020 — The spread of oil from the Deepwater Horizon disaster in the Gulf of Mexico was far worse than previously believed, new research has found.

As the worst offshore oil spill in U.S. history approaches its 10th anniversary in April, a study by two University of Miami researchers shows that a significant amount of oil and its toxic footprint moved beyond fishery closures where it was thought to be contained and escaped detection by satellites as it flowed near the Texas shore, west Florida shore and within a loop current that carries Gulf water around Florida’s southern tip up toward Miami.

In their study, published Wednesday in Science, the researchers dubbed it “invisible oil,” concentrated below the water’s surface and toxic enough to destroy 50 percent of the marine life it encountered. Current estimates show the 210 million gallons of oil released by the damaged BP Deepwater Horizon Macondo well spread out over the equivalent of 92,500 miles.

Read the full story at The Washington Post

The Fight Over Shark Fins in Florida

August 6, 2019 — The fight for sharks is converging on Florida.

With the new legislative session next in September, conservation groups are pushing for measures at both the state and federal level to ban one of the largest threats to the shark population – the fin trade.

Between 100 million and 200 million sharks are killed every year. An estimated 73 million of those are killed for their fins.

“The shark fin trade is a global market for shark fins,” Trish Albano, a shark researcher at the University of Miami’s Rosensteil School of Marine and Atmospheric Science, told NBC 6 South Florida. “The shark fin is being used to make shark fin soup.”

Read the full story at NBC 6

U.S., Cuban marine biologists put an end to ‘academic embargo’

October 22, 2018 — There are no borders that separate the water, reefs and marine life off the coasts of Cuba and Florida, and that’s why scientists in both countries say they need to get along and collaborate.

During the recent MarCuba conference in Havana, U.S. scientific institutions were well represented and researchers also used the conference to highlight research collaborations and a milestone edition of the Bulletin of Marine Science, a respected marine science journal published by the University of Miami’s Rosenstiel School of Marine and Atmospheric Science.

The Bulletin devoted its entire spring issue to marine science research in Cuba, carried out by both U.S. and Cuban scientists.

“Science plays an excellent role in diplomacy,” said Joe Roman, a conservation biologist at the University of Vermont and the guest editor of the special Cuba edition. What better area for collaboration than one with shared ocean systems, fisheries and conservation efforts, he said.

In a Bulletin editorial, Roman wrote that the Cuba edition “celebrates Cuban marine science and conservation efforts, while recognizing that improved relations and increased tourism and trade could put some natural areas at risk. Joint research shows promise that Cuba, the U.S., and other countries can work together on regional conservation efforts.”

“It’s time for Cuban researchers to reach a wider audience,” Roman said.

Read the full story at the Miami Herald