Saving Seafood

Chesapeake Bay Shows Signs Of Health, Despite Historic Rains And Climate Change

April 3, 2019 — There’s good news for the Chesapeake Bay this year. Underwater grasses are at the highest level on record — an important sign of water quality. Blue crabs are being harvested at a sustainable level — meaning there are enough to feed hungry Marylanders while still leaving plenty in the water to reproduce. More than a million acres of land in the Chesapeake watershed have been permanently protected from development since 2010 — preventing the polluted runoff associated with building houses, roads and shopping centers.

The latest barometer of the Chesapeake’s health, released today, shows that by many indicators, the bay is on track to reach restoration goals. Those goals were set by a 2014 agreement between the Environmental Protection Agency and the six states (plus D.C.!) that make up the watershed. The region is supposed to meet the goals by 2025.

“Over the last year, we’ve seen records broken,” said Dana Aunkst, director of the EPA’s Chesapeake Bay Program, which released the annual report. He cited the record 100,000-acres-plus of underwater grasses in the bay — the most, since records began 30 years ago. He also pointed to data showing overall water quality at its highest level recorded.

But by some metrics there is a long ways to go toward full restoration, according to the report. Plus, there are factors working against bay restoration. Top among them: climate change. For the first time, the bay barometer report includes a section on climate.

Read the full story at WAMU

 

Could Prize-Based Competitions Help Pacific Northwest Shellfish Cope With Acidic Seawater?

April 1, 2019 — As human activities continue to add greenhouse gases to the planet’s atmosphere, the oceans absorb nearly one-third of all CO2 emissions. Through a series of chemical reactions, increasing CO2 levels in the ocean have caused seawater to become 30% more acidic over the past century. This process, termed “ocean acidification“,  can disrupt animals’ abilities to smell, regulate their metabolism, and build their shells.

The Pacific Northwest region of the United States, where many economically and culturally valuable fisheries and shellfish farms exist, is especially vulnerable to ocean acidification. The shoreline that stretches from northern California to Alaska is the final destination for globally circulating seawater that accumulates nearly 1,000 years worth of CO2 from the respiration and decomposition of flora and fauna. Seasonal “upwelling” of these millennium-aged deep sea waters and additional CO2 from human activities makes them particularly acidic. Thus, understanding how these acidic waters affect the $220 million Dungeness crab fishery and the $9.4 billion mussel, clam and oyster farming industries in Washington (among many other potentially susceptible operations) is becoming increasingly urgent.

Earlier this week, four United States Congressmembers from Washington, Oregon and Alaska reintroduced a bill called the “Ocean Acidification Innovation Act”. Just like its predecessor from 2017, this bill would allow federal agencies to run prize-based competitions that would increase capacity for studying ocean acidification and mitigating its impacts.

“Our coastal communities depend on a healthy shellfish and fishing industry,” says one of the bill’s co-sponsors Rep. Herrera Beutler (WA-3), while another co-sponsor, Rep. Derek Kilmer (WA-6) added, “There are generations of folks in our coastal communities who have worked in fishing and shellfish growing, but that’s endangered if we don’t maintain a healthy Pacific Ocean.”

Read the full story at Forbes

New England seeing a huge spike in beached sea turtles

March 28, 2019 — At a sea turtle hospital housed at an old New England shipyard, a biologist leans over a table and uses a needle to draw blood from a sick loggerhead before tagging its flailing flipper.

These were the first tentative steps toward a return to the ocean for this juvenile nicknamed Honey Bun and hundreds of other loggerhead, Kemp’s ridley and green turtles stranded this winter on Cape Cod beaches.

The number of warm water turtles stuck on beaches here has risen dramatically in the past decade, according to the Mass Audubon’s Wellfleet Bay Wildlife Sanctuary. This year, volunteers recovered 829 helpless turtles washed up on the sand — about half of them dead including some frozen solid. That’s nearly twice what they found in 2016 and 10 times more than in 2008.

Cape Cod is believed to have one of the largest annual turtle strandings in the world. There are occasional strandings in Florida, Texas and as far north as the Chesapeake Bay. But those tend to be isolated events connected to cold snaps involving a few dozen to a couple of thousand turtles.

Some experts think New England’s spike in cold-stunned turtles is a climate change story with a twist: the hook-like projection of Cape Cod into the Atlantic helps trap turtles drawn there by warming waters but weakened when the ocean cools down. Most rescued turtles suffer from compromised immune systems and pneumonia due to hypothermia. Exposed to cold water for prolonged periods, they become lethargic and can’t move or eat. The ones that survive take months to recover.

Read the full story at the Associated Press

How Cities Can Protect Themselves from Rising Waters

March 28, 2019 — Across the U.S., policymakers are scrambling to protect their communities from the effects of climate change.

In January, Massachusetts Governor Charlie Baker proposed real-estate tax increases to fund dam and drainage system upgrades, which would help residents cope with future floods and storms. Meanwhile, a few months earlier, officials from several Florida counties agreed to work together to minimize the damage caused by rising sea levels.

Adaptation efforts like these are crucial. Four in 10 Americans live in coastal areas. and this population will surge in the coming years. Sustained flooding can cripple homes and infrastructure like roads, bridges, subways and wastewater treatment plants.

Policymakers have limited time and resources, so they should rely on the latest computer modeling and other technologies to identify and implement the most efficient adaptation strategies.

Rising water levels have already wrought havoc across the country. From 2000 to 2015, coastal “sunny day flooding,” or flooding caused by high tides rather than storms, more than doubled on the Southeast’s Atlantic coast, according to the National Oceanic and Atmospheric Association. And it increased 75 percent on the Northeast’s coast.

Climate change is also making storms more destructive and frequent by heating up ocean waters, increasing flooding. The United States experienced its most expensive hurricane season in history in 2017; storms caused more than $300 billion in damages. Flooding and other damage from Hurricane Harvey alone forced 37,000 Texans into shelters in September 2017. Last year, Hurricane Michael caused at least 45 deaths and more than $12 billion in losses.

Read the full story at Scientific American

Climate Change Is Already Reshaping Commercial Fishing

March 26, 2019 — The ocean has been steadily warming over the past 100 years, absorbing most of the heat trapped by atmospheric greenhouse gases. Unless we swiftly and dramatically reduce greenhouse gas emissions, the ocean could warm by as much as 4°C in the next 80 years. This puts fish and the people they feed and employ in hot water. Half of the planet relies on fish as a vital source of protein, and the fishing industry employs more than 56 million people worldwide.

Understanding where and why fisheries have been impacted by warming is necessary to ensure that the ocean remains a source of both nutrition and prosperity. In a study published in Science, I, along with colleagues from Rutgers University and the U.S. National Oceanic and Atmospheric Administration, show that ocean warming has already hurt fisheries’ ability to provide food and support livelihoods around the globe.

Fisheries are like a bank account, where we live off the interest. If fishing reduces the principal too much, the interest is lowered. Similarly, if the environment reduces the interest rate, the interest is also lowered. We combined maps of historical ocean temperature with estimates of historical fish abundance to see how warming has affected the interest rate and returns from the global fisheries bank account.

Fish don’t want their water too hot or too cold. As the ocean warms, they move poleward and into deeper water to follow their preferred temperatures. The impacts of these shifts are complicated; depending on the species, ocean warming and its knock-on effects can either increase or decrease the habitat available to fish. This can either increase or decrease the availability of important species in the food chain. Thus, ocean warming might benefit some fish populations while hurting others.

This is what we found in our research. Although warming has benefited some fisheries, it has hurt others. The losers outweighed the winners, resulting in a net 4% decline in sustainable catch potential over the last 80 years. Four percent might sound small, but it represents a loss of 1.4 million metric tons previously available for food and income.

Some regions have been hit especially hard. The North Sea, which supports large commercial fisheries for species like Atlantic cod, haddock, and herring, has experienced a 35% loss in sustainable catch potential since 1930. The waters of East Asia, neighbored by some of the fastest growing human populations in the world, have seen losses of 8% to 35% across three seas.

Read the full story at Baron’s

Warming oceans cast a chill over New England’s sea turtles

March 26, 2019 — If we ignore the dangerously shifting global climate system, there will be consequences: more extreme rainfall, more intense hurricanes, drier and longer wildfire seasons, and continued sea level rise all loom on the horizon. In fact, extreme weather changes are already being seen around the globe.

But one of the lesser known, already visible impacts of climate change is on sea turtles. A recent paper, led by UMass Amherst doctoral candidate Lucas Griffin, links a rapidly warming Gulf of Maine to increased sea turtle strandings on Cape Cod.

“We were surprised the results suggested this increase was linked with warmer sea surface temperatures,” Griffin says. The scientists originally thought the strandings might be associated with how many young sea turtles hatched. But turtles, it turns out, are just one of many Gulf of Maine species “exhibiting a similar shift in both habitat distribution and in phenology patterns.”

The Gulf of Maine is in crisis: The region is warming faster than 99 percent of the global ocean. Fish stocks are moving north, key food web events like the spring plankton bloom are occurring earlier in the year, and regional waters are staying warmer for longer. Griffin’s team used both machine learning and Bayesian statistical methods—using existing data and probability to quantify uncertainty in inferences—to analyze the relationship between water temperatures and the number of cold-stunned turtles, the potentially lethal turtle equivalent of hypothermia. The innovative approach confirmed what local naturalists and wildlife biologists had been observing for years: Warmer waters in the region actually lead to an increased threat of cold-stunning.

Read the full story at Massive Science

Federal regulators scramble as SC fish start to range north for cooler seas

March 25, 2019 — Shrimp boats from North Carolina pulled up to the McClellanville dock last week, loaded down with catch.

They had been trawling unrestricted ocean waters along the North Carolina-Virginia state line — in other words, hauling in shrimp that spawned in the Chesapeake Bay.

Until a few years ago that was unheard of: The bay just didn’t produce shrimp. It’s too far north.

But fish species are shifting their range as seas warm — four times faster than land species, according to a recent study.

The concerns are for a lot more than shrimp. It’s deep-water finfish as well as surface roamers, species like wahoo, snapper, grouper and cobia. Those are among the most sought after game and seafood fish, and the rules for all of them are under review.

As the waters warm this spring, the near-shore shrimping grounds will open. More of the half-million licensed recreational anglers in South Carolina will crank up boat motors and head out. Commercial boats are out there already. While the pressure on species from overfishing is a long-recognized and long-regulated issue, now there is a new one: How long will this fish even be there?

Anxiety is starting to churn in fishing communities over what will happen to their livelihoods or hobbies. The value to South Carolina of its rich shrimp and finfish waters has been estimated at $44 billion per year for both recreational and commercial fishing combined.

Read the full story at The Post and Courier

Will Large Protected Areas Save the Oceans or Politicize Them?

March 25, 2019 — How can we save the oceans? They cover two-thirds of the planet, but none are safe from fishing fleets, minerals prospectors, or the insidious influences of global warming and ocean acidification.

In the past decade, there has been a push to create giant new Marine Protected Areas (MPAs). They now cover nearly 9.7 million square miles, equivalent to more than the land area of North America. Cristiana Pașca Palmer, executive secretary of the UN Convention on Biological Diversity, says the world is on course reach the convention’s target of having a tenth of the oceans protected by next year.

But questions are being raised. The growth has been driven by the formation of giant MPAs bigger than many countries, often in remote regions where the threat to biodiversity is lower. So, critics are asking, are countries creating big distant MPAs to distract attention from the harder task of protecting trashed coastal ecosystems closer to home? And is there a geopolitical game afoot, a stealth rush to control the oceans for political ends? And does that explain why half of the ocean waters covered by MPAs are in the hands of the United States and two former European colonial powers, Britain and France?

Most ocean scientists see the rush to create vast MPAs as a boon to marine conservation. They are cost-effective, connect different marine ecosystems, and encompass larger parts of the ranges of migrating species such as whales and tuna, protecting “corridors of connectivity among habitats in ways not afforded by smaller MPAs,” says Bethan O’Leary, a marine scientist at the University of York in England.

Read the full story at Yale Environment 360

Now we know how much global warming is reducing the world’s seafood harvest

March 14, 2019 — Among all the knotted problems in the global food supply, it’s hard to think of one that has received more focused attention than global fisheries and the challenges of overexploitation, ecological intricacy, regulatory responses, and failures.

And yet, after decades of international treaties and sustainability studies and harvest limits  — some of the latter volunteered by industry  — a majority of the world’s most important fishing stocks continue to decline.

Overfishing remains the key driver; other factors include pollution and habitat destruction. A typical status report will mention climate change, too, always as an afterthought, an emerging force whose impact cannot yet be calculated.

That changed at the end of February with publication in the journal Science of groundbreaking research that filtered out all other factors, then measured the influence of a warming ocean all on its own. Its unusual approach was to generate a “hindcast,” looking backward through nearly a century of data on seawater temperature and laying these against a standard measure of abundance for fish and shellfish  — maximum sustainable yield  — that has been in use since 1930.

Read the full story at MinnPost