Saving Seafood

What happens to fish and other sea creatures underwater during a hurricane

October 18, 2018 — Hurricanes can be just as deadly for marine life, sometimes stranding them on land or far out at sea. But sometimes marine life benefits or even thrives after these extreme weather events.

Normally when a hurricane is headed for us, we run the other way. But not Isla. She’s a leatherback turtle who was meandering off the coast of Virginia when she accidentally swam straight into Hurricane Florence. Scientists were worried she’d get caught up in the worst of the storm but Isla managed to survive by swimming toward deeper waters.

Turns out, there’s a part of hurricanes we don’t often think about: What happens under the surface. And Isla is just one example.

Far out at sea, fish that live near the surface might feel some turbulence as a storm passes. But most sea creatures — including dolphins, whales, and sharks — avoid the rough surface water and swim to calmer seas. But it’s a different story near shore.

Changes in water temperature and salinity can be catastrophic for marine life. Hurricanes can generate massive waves. Which mix warm surface water with colder, saltier water below generating currents that extend up to 91 meters below the surface. These currents are so strong that they can sweep manatees inland to canals and ponds or away from the coastal waters they prefer, and out into the open ocean. Where they can become disorientated, and even die.

Hurricanes also bring heavy rain, so freshwater often floods coastal regions. And because freshwater is less dense than salt water, it sits on top of the sea water like oil on vinegar. Where it can prevent oxygen from reaching the salty layer below. And disrupt the salinity levels, which can lead to sores, lesions, and ultimately death in whales, dolphins, and porpoises.

Hurricanes also kick up dirt and sand in shallow seas. Which can kill fish by clogging their gills. Experts think this is probably one of the factors that killed an estimated 9.4 million saltwater fish in 1992, during Hurricane Andrew. The dirty, murky water also blocks sunlight from reaching corals and seagrass. In fact, scientists found that coral cover in the Caribbean decreases by 17% in just one year after a hurricane strikes. And that’s in addition to the stress coral already face from human interference.

But it’s not always so bad for sea life. After Hurricane Katrina damaged or destroyed almost 90% of fishing boats in the Mississippi Sound scientists observed a huge increase in dolphin births. Without the fishing boats, dolphins suddenly found themselves with more available prey which helped their populations thrive.

Read the full story at Business Insider

Scallop fishery may be imperiled by acidic seas

October 16, 2018 — Increasingly acidic seas pose a serious threat to the sea scallop fishery, a recent collaborative study by the University of Virginia, the Ocean Conservancy, the NOAA Northeast Fisheries Science Center, and the Woods Hole Oceanographic Institution (WHOI) concluded.

“As levels of carbon dioxide increase in Earth’s atmosphere, the oceans become increasingly acidic — a condition that could reduce the sea scallop population by more than 50 percent in the next 100 years under a worst-case scenario,” the study states. Models from the study, which were published recently in the journal PLOS One, combine existing data with several factors that impact the fishery: “future climate change scenarios, ocean acidification impacts, fisheries management policies, and fuel costs for fishermen.” Those factors were modeled out into 256 different possibilities.

Oceans absorb vast quantities of carbon dioxide. Fossil fuel emissions exacerbate what the oceans take in, further acidifying the water. “That acidity can corrode the calcium carbonate shells that are made by shellfish like clams, oysters, and scallops, and even prevent their larvae from forming shells in the first place,” the study states.

“[The scallop fishery is] healthy and valuable today in part because it is very well managed,” says Scott Doney, a co-author from WHOI and the University of Virginia. “We also used the model to ask whether management approaches could offset the negative impacts of ocean acidification.”

It couldn’t. In every scenario, elevated carbon dioxide levels created acidiferous ocean water. The culprit, the study concluded, was “unabated carbon emissions.”

Read the full story at the MV Times

9 countries and the EU protected the Arctic Ocean before the ice melts

October 12, 2018 —  It’s easy to miss the truly historic nature of the moment.

Last week, nine countries—the U.S., Canada, Russia, Norway, Greenland/Denmark, China, Japan, Iceland, South Korea, and the European Union (which includes 28 member states)—signed a treaty to hold off on commercial fishing in the high seas of the Arctic Ocean for at least 16 years while scientists study the potential impacts on wildlife in the far north. It was an extraordinary act of conservation—the rare case where major governments around the world proceeded with caution before racing into a new frontier to haul up sea life with boats and nets. They set aside 1.1 million square miles of ocean, an area larger than the Mediterranean Sea.

But to really grasp the significance of this milestone, consider why such a step was even possible, and what that says about our world today. For more than 100,000 years the central Arctic Ocean has been so thoroughly covered in ice that the very idea of fishing would have seemed ludicrous.

That remained true as recently as 20 years ago. But as human fossil-fuel emissions warmed the globe, the top of the world has melted faster than almost everywhere else. Now, in some years, up to 40 percent of the central Arctic Ocean—the area outside each surrounding nation’s 200-nautical-mile exclusive economic zone—is open water in summer. That hasn’t yet been enough to make fishing attractive. But it is enough that boats may be lured in soon.

So, for perhaps the first time in human history, the nations of the world set aside and protected fishing habitat that, for the moment, does not even yet exist. The foresight is certainly something to applaud. But it’s hard to escape the fact that the international accord is a tacit acknowledgment—including by the United States, which is moving to back out of the Paris climate accords—that we are headed, quite literally, into uncharted waters.

“The Arctic is in a transient state—it’s not stable,” Rafe Pomerance, a former State Department official who once worked on Arctic issues and now chairs a network of Arctic scientists from nongovernmental organizations and serves on the polar research board of the National Academy of Sciences, said last year.

Read the full story at National Geographic

In Changing Climate, Endangered Right Whales Find New Feeding Grounds

October 10, 2018 — Amy Knowlton pilots the 29-foot research vessel Nereid out of Lubec harbor and into the waters of the Bay of Fundy, off of easternmost Maine. A scientist with the New England Aquarium’s Anderson Cabot Center for Ocean Life Knowlton points to harbor porpoises chasing fish in the wind-swept waters on a recent morning.

Then something much larger appears off the stern.

“Whale behind us,” Knowlton says, steering closer. “It’s probably a humpback or fin whale, we’ll get a better look.”

It turns out to be two humpback whales — a cool sighting, but not the kind she is after.

Knowlton is hoping to find the endangered North Atlantic right whales that she and her colleagues have been studying in these waters since 1980.

Right whales are large cetaceans, with big heads and no dorsal fins. Researchers used to count as many as 200 foraging here in late summer. But the whales became scarce starting in 2010, and their range shifted dramatically. Many more are now summering hundreds of miles north, off Canadian shores in the Gulf of Saint Lawrence. More than 130 have been spotted there in recent months.

Marianna Hagbloom, a research assistant on Knowlton’s team, surveyed that area in August and said it was nothing like the Bay of Fundy.

“We had days where we were seeing about 50 individuals,” Hagbloom says. “Just right whales popping up left and right. It’s a beautiful thing to see.”

Read the full story at NPR

Wide-scale US wind power could cause significant warming

October 5, 2018 — It’s expanded 35-fold since 2000 and now provides 8% of the nation’s electricity. The US Department of Energy expects wind turbine capacity to more than quadruple again by 2050.

But a new study by a pair of Harvard researchers finds that a high amount of wind power could mean more climate warming, at least regionally and in the immediate decades ahead. The paper raises serious questions about just how much the United States or other nations should look to wind power to clean up electricity systems.

The study, published in the journal Joule, found that if wind power supplied all US electricity demands, it would warm the surface of the continental United States by 0.24 ˚C. That could significantly exceed the reduction in US warming achieved by decarbonizing the nation’s electricity sector this century, which would be around 0.1 ˚C.

“If your perspective is the next 10 years, wind power actually has—in some respects—more climate impact than coal or gas,” coauthor David Keith, a professor of applied physics and public policy at Harvard, said in a statement. “If your perspective is the next thousand years, then wind power is enormously cleaner than coal or gas.”

Specifically, the “avoided warming” achieved by eliminating fossil-fuel sources could surpasses any warming from wind in about a century in the studied scenario, as emissions reductions accumulate.

Keith and lead author Lee Miller, a postdoc at Harvard, stress that the conclusions mean scientists and policymakers should take this side effect of wind power seriously—and carefully consider what role the resource should play in the shift to clean energy.

“Our analysis suggests that—where feasible—it may make sense to push a bit harder on developing solar power and a bit less hard on wind,” Keith said in an e-mail.

Notably, the warming effect from wind in the studied scenario was 10 times greater than the climate effect from solar farms, which can also have a tiny warming effect.

Read the full story at MIT Technology Review

Latest shrimp assessment points to closure of fishery

October 5, 2018 — The shrimp section of the Atlantic States Marine Fisheries Commission voted Thursday to accept the 2018 benchmark assessment for northern shrimp that continues to reflect a stock in free fall and facing a highly uncertain future.

The assessment seems to point to another closure for the fishery that has been shuttered since after the 2013 fishing season because of the dire and deteriorating state of the northern shrimp stock.

The final decision on whether to close the fishery for the sixth consecutive year will come in November, when the shrimp section and its advisory panel are scheduled to meet to set specifications for the 2019 fishing season.

It does not look good.

The assessment, according to the section, indicates the northern shrimp population remains severely depleted, spawning stock biomass remains at the same low levels that have existed since 2013 and recruitment of new shrimp into the fishery continues at historically low numbers.

It also underlines the negative impact of the Gulf of Maine’s warming waters on the northern shrimp stock.

“Warmer water temperatures are generally associated with lower recruitment indices and poorer survival during the first year of life,” the section said in a statement. “Ocean temperatures in the western Gulf of Maine shrimp habitat have increased over the past decade, and temperature is predicted to continue rising as a result of climate change. This suggests an increasingly inhospitable environment for northern shrimp in the Gulf of Maine.”

Read the full story at the Gloucester Daily Times

MASSACHUSETTS: Project to Clean Buzzards Bay Watershed Receives $420K in Grant Funding

October 4, 2018 — The Buzzards Bay Coalition has received nearly $420,000 in grant funding for its effort to expand wastewater treatment to more upper Buzzards Bay watershed communities.

The Southeast New England Program awarded the funding for the Coalition’s partnership that would reduce tens of thousands of pounds of nitrogen each year to help clean several waterways in the watershed that are on the state’s dirty waters list.

The project would expand wasterwater treatment to more upper Bay communities in Wareham, Bourne, Plymouth and Marion.

Wastewater, particularly from traditional home septic systems, is the largest source of nitrogen pollution to the bay.

Nitrogen pollution turns the water cloudy and murky and harms habitat for underwater species like fish, crabs, quahogs, and bay scallops.

The waterways of the upper portion of Buzzards Bay – the Agawam River and Wareham River,Buttermilk Bay and Little Buttermilk Bay, Sippican Harbor,Aucoot Cove, and the Weweantic River– make up one-third of the entire Buzzards Bay watershed. Every single one of these waterways is on the state’s “dirty waters” list.

The first phase of this project, funded with a SNEP grant in 2015, studied whether it would be feasible to move the discharge pipe from the narrow, upstream waters of the Agawam River to the site of the Massachusetts Maritime Academy’s existing wastewater treatment plant discharge pipe at the Cape Cod Canal. Through sound science, the project showed that relocating the Wareham discharge pipe would not harm the upper Bay’s health – in fact, it could reduce approximately 80,000 pounds of nitrogen to the Bay per year.

Read the full story at CapeCod.com

Eastern Maine Skippers event focuses on rapid changes in fishing industry

October 4, 2018 — Commercial fishing is one of Maine’s oldest industries. It is also facing rapid adjustments based on environmental changes and emerging technologies.

More than 100 Downeast area high school students gathered at the Schoodic Institute last week as part of the Eastern Maine Skippers Program to learn about these changes.

The event was the first of four “cohort” days for the program, in which students from the participating high schools meet one another, hear from industry leaders and begin shaping projects they will work on during the coming school year.

“This brings in kids from all these different communities and they get to know each other work together,” said Mike Thalhauser, a fisheries science and leadership advisor with the Maine Center for Coastal Fisheries.

The Eastern Maine Skippers Program started in 2012. Since then it has expanded to over 120 students and nine schools. New this year is Sumner Memorial High School in Sullivan, which has eight students participating.

“The students will spend the next couple of months figuring out what they want to work on for the year,” said Sumner science teacher Morgan Forni, who is supervising the program at the school. “There’s a really broad range of interests for the students.

The theme for this year is technology. Over the course of the year students will look at how technology contributes to a safe and healthy fishing industry, to sustainable fishing practices, to a better future understanding of fisheries and to a thriving local fisheries economy.

In addition to the cohort meetings, participating students work on individual or group projects based on applying technology to a safe and sustainable fishing industry.

Read the full story at The Ellsworth American

US, Russia, China, others to sign agreement preventing illegal fishing in Arctic

October 3, 2018 — The United States is set to join nine other countries and organizations in a first-of-its kind agreement to protect Arctic Ocean waters from commercial fishing.

The pact, scheduled to be signed Wednesday, 3 October in Ilslissat, Greenland, comes after two years of negotiations between countries with coastlines on the Arctic as well as other major fishing powers. Those nations concluded talks last November.

The agreement comes as polar melting has reduced the Arctic ice cap and open new areas in the central part of the ocean for vessels. That means commercial fishing may be viable in those areas.

However, nine years ago, the U.S. closed its exclusive economic zone in the Arctic off the northern Alaskan coast to commercial fishing operations until government officials learned more about the region’s ecosystem. Alaska fishermen have expressed fears that the melting could lead to foreign vessels fishing in U.S. waters.

In a statement released 1 October, the U.S. State Department said the Greenland agreement cuts down chances of illegal fishing taking place in U.S. waters currently off limits to American fishermen.

Under terms of the agreement, the participating nations must create plan to study the Arctic’s ecosystem and not just for fishing purposes.

Michael Byers, an international law professor at the University of British Columbia, praised the countries for their forward thinking on the matter in a Canadian Press article.

Read the full story at Seafood Source

New Study Shows Climate Change Could Reduce Scallop Population

October 3, 2018 — Researchers in Massachusetts say under the worst case scenario, climate change could reduce the scallop population by more than 50 percent in just a few decades, which could be bad news for New Bedford’s lucrative fishing port.

In 2016, commercial fishermen landed more than $300 million worth of fish at the Port of New Bedford, and 85 percent of that value came from scallops.

A new study from Woods Hole Oceanographic Institution shows as carbon emissions in the atmosphere increase, so does the acidity in the ocean.

Jennie Rheuban, lead author of the report, said that could affect how well scallops can grow.

“Adults may actually be growing slower and calcifying less quickly under these acidified conditions because it’s more difficult for them to lay down calcium carbonate as a shell,” Rheuban said.

Rheuban said ocean acidification could also cause scallops to become more vulnerable.

“They aren’t able to swim quite as well when they’re experiencing acidified conditions, and so we hypothesize that under acidification, scallops may be more susceptible to predation,” she said.

Read the full story at Rhode Island Public Radio