Saving Seafood

Eating Fish May Protect the Brain From Pollutants

July 15, 2020 — Eating fish could help protect the brain against the detrimental effects of air pollution, a new study suggests.

Previous studies have shown that exposure to the smallest particles of air pollution, called PM 2.5, is associated with decreases in brain volume, which may increase the risk of memory and thinking problems as we age. This new study, published in Neurology, included 1,315 women ages 65 to 80 who underwent brain M.R.I. imaging to determine brain volume.

The participants filled out questionnaires on their fish consumption and had blood tests to determine their levels of omega-3s, the healthy unsaturated fatty acids found in fish. Using data from the Environmental Protection Agency, the researchers tracked three-year levels of air pollution at the women’s addresses.

Read the full story at The New York Times

The Complicated Role of Iron in Ocean Health and Climate Change

January 6, 2020 — One brisk day in April 2013, as he drove with colleagues along the southern coast of Patagonia, Mike Kaplan spotted a geologist’s treasure trove—an active gravel pit with freshly exposed walls. He pulled over, grabbed the backpack full of digging tools stowed in the car trunk and walked into the large hole.

To Kaplan’s south lay the Southern Ocean, stretching toward Antarctica. Strewn around him was evidence of Earth’s most recent ice age: heaps of crushed rock and gravel released by one of the many glaciers that had once covered North and South America. Standing in the pit, Kaplan spotted what he was looking for: a layer of fine gray silt deposited by ice sheets roughly 20,000 years ago.

A geologist at Columbia University in New York, Kaplan has spent over a decade collecting the sediments that make dust, and studying how that dust, launched from earth to air to sea, influences Earth’s climate, past and present. Dozens of intriguing samples have made their way home with him, stowed in his suitcase or shipped in a duct-taped cardboard box. As he scraped the dark gray sediment into a plastic bag, he felt a rush of anticipation. Given the sample’s location, he thought that it might be just what he needed to test an aspect of a controversial idea known as the iron hypothesis.

Read the full story at the Smithsonian Magazine

EEZs deter unauthorized fishing – but only in high-value fisheries

November 8, 2019 — Exclusive economic zones (EEZs) deter unauthorized fishing by foreign vessels, but only in a handful of countries where the value of the fishery surpasses steep enforcement costs.

A new study finds that unauthorized fishing is 81 percent lower just inside the 200-mile EEZ boundaries compared to just outside them, an indication that assigning nations fishing property rights could lead to protecting fisheries from unauthorized fishing.

Read the full story at Seafood Source

Lionfish ear-bones reveal a more mobile invasion

July 19, 2019 — Just as lions are apex predators on land, lionfish in Florida are an underwater force to be reckoned with. The biggest threat they pose, however, is not their venomous spines. It is the alarming speed and ferocity with which they invade new waters, eating prey that have not evolved to recognize them as a predator, stealing food from important commercial fish like snapper and grouper, and spawning baby lionfish at incredible rates.

In the 1980s, lionfish (native to the South Pacific and Indian Ocean) were introduced to Floridian waters, possibly by humans who bought them as exotic pets and later released them to the ocean. Over the next decades they spread rapidly, and today they have thoroughly invaded their preferred warm waters in the Atlantic, Gulf of Mexico, and Caribbean, damaging the native coral reef systems and food webs.

“The destructive nature of the lionfish invasion is partly to blame on their reproductive success,” says Montana Airey, a masters student at Columbia University who studies lionfish. “They can produce thousands of eggs every week, which after hatching can spread widely on ocean currents. Also, since they are invaders, their prey don’t recognize them as dangers, so they can eat without much effort.”

As adults, lionfish tend to be slow-moving and stay local, not straying far from their settled reef home. The invasiveness of lionfish is therefore thought to happen when they are small, larval fish being carried to new places by currents. However, researchers have little information about how grown lionfish might invade or move to new waters because tracking small marine organisms poses difficulties.

One way to investigate their movements, though, is to study their ear-bones.

Read the full story at Science Daily

We Know Plastic Is Harming Marine Life. What About Us?

May 16, 2018 — In a laboratory at Columbia University’s Lamont-Doherty Earth Observatory, in Palisades, New York, Debra Lee Magadini positions a slide under a microscope and flicks on an ultraviolet light. Scrutinizing the liquefied digestive tract of a shrimp she bought at a fish market, she makes a tsk-ing sound. After examining every millimeter of the slide, she blurts, “This shrimp is fiber city!” Inside its gut, seven squiggles of plastic, dyed with Nile red stain, fluoresce.

All over the world, researchers like Magadini are staring through microscopes at tiny pieces of plastic—fibers, fragments, or microbeads—that have made their way into marine and freshwater species, both wild caught and farmed. Scientists have found microplastics in 114 aquatic species, and more than half of those end up on our dinner plates. Now they are trying to determine what that means for human health.

So far science lacks evidence that microplastics—pieces smaller than one-fifth of an inch—are affecting fish at the population level. Our food supply doesn’t seem to be under threat—at least as far as we know. But enough research has been done now to show that the fish and shellfish we enjoy are suffering from the omnipresence of this plastic. Every year five million to 14 million tons flow into our oceans from coastal areas. Sunlight, wind, waves, and heat break down that material into smaller bits that look—to plankton, bivalves, fish, and even whales—a lot like food.

Read the full story at National Geographic

 

Scott Pruitt pushes back on finding that would restrict pesticides’ use to protect fish

February 5, 2018 — For months, chemical companies have waged a campaign to reverse findings by federal fisheries scientists that could curb the use of pesticides based on the threat they pose to endangered species. They scored a major victory this week, when Environmental Protection Agency Administrator Scott Pruitt announced he would press another federal agency to revisit a recent opinion triggering such restrictions.

The struggle over an arcane provision of the Endangered Species Act, in which the EPA must affirm that the pesticides it oversees do not put species’ survival in jeopardy, has become the latest front in the battle over a broad-spectrum insecticide known as chlorpyrifos. Pruitt denied a petition to ban its agricultural use after questioning EPA scientists’ conclusions that exposure impedes brain development in infants and fetuses.

Speaking to the National Association of State Departments of Agriculture on Wednesday, Pruitt said he plans to inform the National Oceanic and Atmospheric Administration’s Marine Fisheries Service “that there needs to be a consultation because we have usage data, frankly, that wasn’t considered.”

NOAA Fisheries issued a Biological Opinion on Dec. 29, which was publicly released Jan. 9 by the environmental law firm Earthjustice, finding that the current use of chlorpyrifos and malathion “is likely to jeopardize the continued existence” of 38 species of salmon and other fish in the Pacific Northwest and destroy or harm the designated critical habitat of 37 of those species. It found another pesticide, diazinon, could jeopardize the continued existence of 25 listed fish species and could harm critical habitat for 18 of them.

In allowing chlorpyrifos to stay on the market — the product is already prohibited for household products — Pruitt cited concerns raised by the Department of Agriculture, pesticide industry groups and an EPA scientific review panel about studies the agency used to conclude that the pesticide poses a serious enough neurological risk to ban its use on dozens of crops. One study, by researchers at Columbia University, found a connection between higher exposure levels to chlorpyrifos and learning and memory problems among farmworkers and children.

Read the full story at the Washington Post

 

Cod and climate: North Atlantic Oscillation factor in decline

July 28, 2016 — In recent decades, the plight of Atlantic cod off the coast of New England has been front-page news. Since the 1980s in particular, the once-seemingly inexhaustible stocks of Gadus morhua — one of the most important fisheries in North America — have declined dramatically.

In 2008, a formal assessment forecasted that stocks would rebound, but by 2012, they were once again on the verge of collapse. Two years later, the National Oceanic and Atmospheric Administration instituted an unprecedented six-month closure of the entire Gulf of Maine cod fishery to allow stocks to recover.

While overfishing is one known culprit, a new study co-authored by researchers at UC Santa Barbara and Columbia University finds that the climatological phenomenon known as the North Atlantic Oscillation (NAO) is also a factor. And it contributes in a predictable way that may enable fishery managers to protect cod stocks from future collapse. The group’s findings appear in the journal PLOS ONE.

“In the 1980s, the North Atlantic was stuck in a positive phase of NAO,” said lead author Kyle Meng, an economist at UCSB’s Bren School of Environmental Science & Management. “We show not only that positive NAO conditions diminish a few consecutive cohorts of cod larvae but also that this effect follows a cohort as it matures.”

Read the full story at Science Daily

Overfishing Not Solely to Blame for New England Cod Collapse

July 28, 2016 — Overfishing is a known culprit of the decline of Atlantic cod off the coast of New England but now, a new study co-authored by researchers at UC Santa Barbara and Columbia University has found that the climatological phenomenon known as the North Atlantic Oscillation (NAO) is also a factor. And it contributes in a predictable way that may enable fishery managers to protect cod stocks from future collapse.

“In the 1980s, the North Atlantic was stuck in a positive phase of NAO,” said lead author Kyle Meng, an economist at UCSB’s Bren School of Environmental Science & Management.

“We show not only that positive NAO conditions diminish a few consecutive cohorts of cod larvae but also that this effect follows a cohort as it matures.”

The NAO is a periodic climatic phenomenon that, like El Niño, causes changes in water temperatures, although the mechanism is different and the NAO affects the North Atlantic rather than the Pacific.

Also like El Niño, the NAO may be affected in terms of both strength and frequency by climate change. The researchers found that, since 1980, NAO conditions have accounted for up to 17 per cent of the decline in New England cod stocks.

“The Atlantic cod fishery has been the poster child of fishery science and challenges in the field,” said co-author Kimberly Oremus of Columbia University’s School of International and Public Affairs.

Read the full story at The Fish Site