Saving Seafood

Climate change conflicts are here – and ‘scallop wars’ are just the beginning

September 11, 2018 — As the planet warms, species are moving further north to climate zones which are closer in temperature to what they originally evolved in. The oceans have absorbed most of this temperature increase, and so many marine species, including commercially fished scallops, are under particular stress to migrate northwards to cooler waters.

In the face of this disruption, legal boundaries for fishing fleets could become increasingly irrelevant. As the fish stocks they once contained move out, conflict is likely to arise between countries exploiting neighbouring fishing grounds.

As a result, the ongoing “scallop war“, which has seen tense physical confrontations between French and British fishers over access to these prized molluscs, may be a taste of worse to come.

The habitat ranges and migration patterns of commercial species in the ocean have been carefully studied throughout history, so that fishing fleets can exploit them more efficiently. This understanding has informed the division of fishing grounds according to who has the right to harvest them.

French scallop fishers were incensed over their British counterparts’ alleged pillaging of scallop stocks, as smaller British boats aren’t bound by a French law that prohibits dredging in the Baie de Seine from October 1 through May 15, to allow scallop populations to recover.

While on the surface it might seem that these skirmishes are anchored to specific circumstances – potentially inflamed by existing tensions around Brexit – they highlight the enormous difficulties in clearly mapping and enforcing legal boundaries around natural habitats that are changing rapidly.

Read the full story at PHYS.org

Warming water drawing whales closer to shore

September 10, 2018 — Rising water temperatures have drawn whales closer to shore this year, experts say.

Several humpback whales, and some minke whales, have been seen close to shore, a paddelboarder caught on video just a few feet away from a humpback whale near Salisbury Beach, Mass., a week ago. A humpback was also caught in fishing gear in Rye a couple days before, and footage of close encounters with whales in New England have been posted all over social media and covered in news reports in recent months.

Tony LaCasse, spokesman for the New England Aquarium in Boston, said the higher water temperatures, believed to be brought on by climate change, have led to bait fish called menhaden, locally known as “pogies,” appearing closer to shore.

Pogies, he said, eat plankton that have been growing closer to shore because of the higher water temperatures, and several animals including the whales eat the pogies, following them near land. Drone footage of a whale feeding off the coast of Seabrook over Labor Day weekend went viral this week and made news headlines.

LaCasse said whales have been seen close to shore throughout the region this year with sightings in the mouth of the inner harbor in Boston. New England news stations showed footage recently of a whale in Beverly Harbor in Massachusetts lunge feeding, plowing through a school of fish to gulp a couple hundred pogies in its mouth while sending another hundred or so flying through the air, he said.

“They’re going to be close to shore so long as the menhaden are here,” LaCasse said.

He said the menhaden will migrate from the area when the temperature starts to drop.

Read the full story at Fosters.com

What is the Global Footprint of Fishing?

September 5, 2018 — Thanks to Global Fishing Watch, a new partnership between Oceana, SkyAtlas, and Google, scientists may be getting closer to figuring out how much of the world’s ocean is fished—but discrepancies in the scale of data are producing wildly different answers.

Global Fishing Watch launched in 2016 as a way to track fishing boats around the world. The core data comes from boats’ automatic identification system (AIS), a GPS system that pings out its location every 30 seconds to satellites. Most large boats around the world (not just fishing boats) are required to have AIS onboard for monitoring purposes and safety. Global Fishing Watch collects AIS data on all boats around the world to “determine the type of ship (e.g., cargo, tug, sail, fishing), its size, what kind of fishing gear (e.g. longline, purse seine, trawl) it’s using, and where and when it’s fishing based on its movement patterns.” It is an impressive way to collect fishing data and shows some promise for curbing illegal fishing. You can read more about it here.

One of the first major publications to come out of these AIS data attempted to map the ‘global footprint’ of fishing. It concluded that 55% of the global ocean was fished. However a recent paper, using the exact same data, concluded that only 4% of the global ocean is fished. An order of magnitude difference! What is going on here?

Read the full story at Sustainable Fisheries UW

Climate change, scorching summers bring more Southern fish to Delaware waters

September 4, 2018 — Surrounded by some of the largest coastal estuaries on the East Coast, Delaware sees its fair share of varied marine life from sharks and whales to funky fish and crustaceans.

But rising temperatures on land and sea are starting to mix things up even more.

Some species previously known to frequent Florida, others that rarely traveled beyond the Chesapeake Bay and tropical fish that look like they came from a fancy aquarium instead of First State waters are catching the attention of fishermen and scientists along the coast.

“There is an issue with climate change, or whatever you want to call it,” said Rich King, an avid fisherman, Sussex County resident and the mind behind DelawareSurfFishing.com. “It’s affecting the fish stocks because they’re changing migration patterns.”

On King’s website, which chronicles the ins-and-outs of fishing along the Delaware coast, reports outline everything from tropical Portuguese men-o-war washing ashore to foot-long Florida pompano to fancy butterfly fish caught in crab traps.

Read the full story at the Delaware News Journal

Melting ice poses fleeting ecological advantage but sustained global threat, Stanford scientist says

August 31, 2018 — From collecting field samples inside the ocean’s frozen ice pack to analyzing satellite images in the comfort of his Stanford office, Kevin Arrigo has been trying to figure out how the world’s rapidly thinning ice impacts polar food chains. Arrigo, a professor of Earth system science at Stanford School of Earth, Energy & Environmental Sciences, found that while melting ice threatens to amplify environmental issues globally, ice sheet retreat can provide much-needed food in local ecosystems.

Through this work, Arrigo discovered that thinning ice at the poles can alleviate polar food deserts by extending phytoplankton blooms. However, the silver lining associated with melting ice cannot make up for imminent threats, such as rising sea levels, associated with unchecked glacial shrinkage.

Arrigo, who is also the Donald and Donald M. Steel Professor in Earth Sciences, spoke with Stanford Report about his work on polar phytoplankton blooms and discussed whether recent news about sea ice breaking up suggests we’ve reached a tipping point.

What have you learned about how glacial melt impacts food chains in the extreme environments of the poles?

It turns out that when glaciers form, they accumulate particles and dust that contain essential nutrients like iron, on which all living things depend for survival. As glaciers melt, they add nutrients to the ocean and fertilize the local ecosystem. In Greenland and Antarctica, the ocean is short on iron, so melting glaciers make up for the lack of iron.

Read the full story at Stanford News

 

Waters off New England in midst of record year for warmth

August 31, 2018 — The waters off of New England are already warming faster than most of the world’s oceans, and they are nearing the end of one of the hottest summers in their history.

That is the takeaway from an analysis of summer sea surface temperatures in the Gulf of Maine by a marine scientist with the Gulf of Maine Research Institute in Portland. The average sea surface temperature in the gulf was nearly 5 degrees Fahrenheit above the long-term average during one 10-day stretch in August, said the scientist, Andy Pershing, who released the work Thursday.

Aug. 8 was the second warmest day in recorded history in the gulf, and there were other sustained stretches this summer that were a few degrees higher than the average from 1982 to 2011, Pershing said. He characterized this year as “especially warm” even for a body of water that he and other scientists previously identified as warming faster than 99 percent of the global ocean.

Read the full story from the Associated Press at ABC News

Global fisheries could still become more profitable despite global warming

August 30, 2018 — Researchers from Japan’s Hokkaido University, the University of California, Santa Barbara (UCSB), National Center for Ecological Analysis and Synthesis, and Environmental Defense Fund  (EDF) found that harvesting sustainable amounts of seafood globally over the next 75 years can lead to higher total food production and profits, even taking into consideration the fish populations which are projected to decline as the ocean warms and habitats change.

This is because, under what has been determined as the best management scenario, some major fish and shellfish stocks that are commercially harvested, broadly referred to as fisheries, will grow and become more profitable, offsetting the many others projected to shrink or even disappear. On a global average, profitability could rise by 14 billion USD and harvest by 217 million metric tons above today’s levels, according to the study.

There is a catch. In the model, the growth was achieved under the projected moderate warming of 2.2°C (3.9°F) above average global temperatures by 2100. But if temperatures rise further, global fish harvest and profits are expected to decline below today’s levels even with the best management in place.

The researchers say their study, published in Science Advances, conveys an important message: the oceans can continue to be a source of healthy seafood and sustainable livelihoods for billions of people, but only if action is taken to manage the stocks well and limit the carbon emissions that drive climate change.

Read the full story at Science Daily

Fish populations could rise in warming climate with better management

August 30, 2018 — Better management of fisheries and fishing rights around the world could increase profits and leave more fish in the sea as long as measures to meet climate obligations are taken, new research has found.

Even if temperatures rise by as much as 4C above pre-industrial levels – in the upper range of current forecasts – the damaging effects on fishing can be reduced through improving how stocks are fished and managed.

Governments are meeting from 4 September in New York for the first round of talks on a new global treaty of the high seas, which would aim to conserve overfished stocks and make access to key fisheries more equitable. Any agreement is likely to take several years to negotiateand longer to come into force, but scientists say there is no time to be lost, given the magnitude of the threat to the world’s marine ecosystems.

Climate change is already causing the movement of some species as their traditional habitats grow warmer, and overfishing is wreaking heavy damage on stocks. However, by adapting fisheries management to a warming climate, and instituting better systems such as monitoring of fleets, the global catch can be increased despite these factors, according to the paper published on Wednesday in the journal Science Advances.

“This is a positive message amid the doom and gloom,” said Kristin Kleisner, one of the authors of the study and a senior scientist at the US Environmental Defense Fund. “We can control how we manage our fisheries. We will have severe effects [from climate change] but this shows what we can do as humans to control that.”

Read the full story The Guardian

Climate Change Impacts On Cold Water Fishing

August 23, 2018 — Each year, more than 49 million Americans fish recreationally in freshwater rivers and lakes. Some fish to relax, and some for the thrill. But in a changing climate, a new generation of anglers will have to get used to conditions far different from those of their parents and grandparents. Warming water in streams, rivers, and lakes is changing the habitats and behavior of fish, and resulting in a wide range of impacts in different parts of the U.S.

Cold water fish, like trout and salmon, struggle in warmer water. The amount of dissolved oxygen in the water drops as the water warms, causing the fish to become less active. For these fish, that critical temperature is about 70°F. In the Northwest, a general decline in snowpack has led to lower streamflows and warmer water in spring and summer, meaning that the 70°F threshold is exceeded more often. Montana has recently closed some rivers to recreational fishing, even for catch-and-release, because of physical stress on the fish.

Although smallmouth and largemouth bass do just fine at water temperatures above 70°F, which are more common in the Southeast, the warmer water creates a more active breeding ground for bacterial infections and parasites. In the Northeast, a 2005 die-off of smallmouth bass in the Susquehanna River was traced to a bacterial disease called Columnaris, which becomes more contagious at higher water temperatures. And in the Great Lakes, warmer water has increased the size and feeding rates of the parasitic sea lamprey, which latches onto and devastates trout, salmon, perch and catfish. Just one sea lamprey can kill 40 pounds of fish during its 12-18 month feeding period.

The best time of the year for fishing is also changing in a warming climate, which has an economic impact on communities across the country. Bass, salmon, and shad in the Pacific Northwest and trout in New England are migrating or spawning earlier in the year. Anglers who plan vacations based on the best time year to fish may find the peak of the season has passed by the time they arrive. In addition to the disappointment, this mistiming can affect everything from businesses selling fishing equipment and operating field guides to housing and hospitality revenues. All told, freshwater fishing contributed $41.9 billion to the to the U.S. economy in 2016.

Read the full story at KBZK

MAINE: Odds may be bad for winter shrimp fishery

August 22, 2018 — Scientists gathered at a downtown hotel last week for a three-day “peer review” of the latest Northern Shrimp Benchmark Stock Assessment from by the Atlantic States Marine Fisheries Commission.

The assessment evaluates the condition of the Gulf of Maine northern shrimp resource and provides regulators with the information they need to manage the fishery.

The sessions were mostly open to the public but, as of Tuesday morning, the ASMFC had yet to publish a summary of the proceedings.

Whatever happened, the odds are against the fisheries managers allowing any shrimp fishing this coming winter.

Last year’s stock report showed that stock abundance and biomass between 2012 and 2017 were the lowest on record during the 34 years records have been kept. The 2017 numbers were the lowest ever observed.

Recruitment — the number of animals entering the fishery — has been poor since 2011 and includes the four smallest year classes on record.

There is little to suggest those numbers are likely to improve.

Recruitment of northern shrimp is related to both spawning biomass and ocean temperatures, with higher spawning biomass and colder temperatures producing stronger recruitment.

Read the full story at The Ellsworth American