Saving Seafood

Endangered status of Atlantic sturgeon up for review

March 27, 2018 — Federal fishing regulators say they are conducting a five-year review of threatened and endangered populations of Atlantic sturgeon.

Populations of sturgeon are listed as threatened in the Gulf of Maine and endangered in New York Bight, the Chesapeake Bay and off the Carolinas and South Atlantic.

The National Oceanic and Atmospheric Administration says the Endangered Species Act requires the agency to conduct the review to ensure the listings are still accurate. The listings are intended to be based on the best available scientific data.

The Atlantic States Marine Fisheries Commission said last year that a sturgeon stock assessment indicated the population is still very low compared to its historical abundance. They face threats such as climate change, ship strikes and fishing.

Sturgeon suffered overfishing in the 20th century when it was harvested for eggs for caviar.

Shortnose sturgeon are listed under the Endangered Species Act (ESA) as an endangered species throughout their range. Atlantic sturgeon are listed as five distinct population segments with those that hatch out in Gulf of Maine rivers listed as threatened, and those that hatch out in other U.S. rivers listedas endangered.

Once thought to number less than 100 in the Merrimack, the river’s shortnose sturgeon population has been on the rebound, researchers have said. Atlantic sturgeon are also found in the Merrimack, up to the Essex Dam in Lawrence.

Two distinct groups of adults, numbering more than 2,000, inhabit the river. One group includes fish born in Haverhill’s spawning grounds, while the other consists of fish born in Maine rivers such as the Kennebec and Androscoggin, which migrate to the Merrimack.

Researchers say that for much of the year, sturgeon are looking for food in the lower part of the Merrimack — from Amesbury to the Joppa Flats in Newburyport — and live there from November to March.

Haverhill is the only place in the river where sturgeon lay their eggs, and that happens in the spring.

Read the full story at the Gloucester Times

 

Warming world will affect fish size and fisheries

March 26, 2018 — Current fishery targets may become unachievable as the planet warms.

A new study, led by Plymouth Marine Laboratory (PML), has found that the proportion of large  in the North Sea may decrease as climate change unfolds, by as much as 60% in some areas. The effects of warmer waters and ocean acidification may mean proposed fisheries management targets based on fish size could be unachievable if the effects of  on fish size are not considered.

Using state-of-the-art modelling and comparison with real-life surveys, the researchers demonstrated they can simulate how fish size is changing in our marine environment, under the pressures of fishing and environmental factors. This form of modelling, combining important indicators and environmental change, can help with sustainable exploitation of fished stocks by helping policy makers consider how wild populations are impacted by changing, warmer and more acidic oceans into the future.

Indicators based on fish size are widely used in the study and management of wild populations exploited by commercial fishing. The Large Fish Indicator (LFI) is one such example, determining the biomass of fish above a certain size in a community, and used to inform policy and guide the .

While widely used, however, these types of indicators have not previously been used alongside predictions of future conditions in line with expected climate change. Fish size closely reflects the environment, and a warming world will change the conditions in which fish live. It has been suggested that rising water temperatures in the North Sea, for example, are driving down fish size in key species. By modelling North Sea fish populations alongside predicted  for LFI, scientists have shown how  may affect fish communities, and what it may mean for fisheries.

Read the full story at PHYS

 

Climate change threatens coastal life as we know it

March 9, 2018 — The Gulf of Maine is getting warm — quick. From 2004–2013, sea temperatures there rose faster than almost any other location on Earth.

Why it matters: The Gulf is home to a number of endangered species, and the fisheries there bring in several billion dollars per year to the U.S. and Canada, but the Gulf’s future hangs in the balance. Researchers are scrambling to understand what the warming water means for the people and animals who rely on the ecosystem, particularly as the changes there provide a glimpse into the future of coastlines around the world.

Why it’s warming

The Gulf of Maine lies at the intersection of several major ocean currents, including the Atlantic meridional overturning circulation, which moves dense, cold water down and toward the equator. Fresh water from melting sea ice seems to be weakening this current, which could be causing the Gulf to warm faster than other regions.

A combination of cold winters, warm summers, and dramatic tides make the Gulf one of the most productive ecosystems in the ocean. It’s a critical habitat for right whales, seabirds like puffins, humpback whales, bluefin tuna and other species.

Read the full story at Axios

 

These Chinook almost went extinct during California’s drought. Can this $100 million plan save them?

March 9, 2018 — During the worst of California’s five-year drought, thousands of eggs and newly spawned salmon baked to death along a short stretch of the Sacramento River below Shasta Dam.

The winter-run Chinook, already hanging by a thread, nearly went extinct.

Hoping to avoid a repeat of that dire scenario, fisheries officials announced Thursday the launch of a plan — nearly 20 years and $100 million in the making — they say would expand the spawning range of the fish to include a cold-water stream called Battle Creek. The idea is that the stream could keep the fragile winter-run alive as California’s rivers get hotter because of a warming climate.

The stakes are high and go well beyond the fate of the fish. Concerns about this run of salmon have a major impact on how water is distributed to farms and cities across California.

During the drought, for example, farmers experienced cuts to their water supply as dam managers held water in Shasta, the state’s largest reservoir, in a frantic effort to ward off extinction of the Chinook.

Read the full story at the Sacramento Bee

Climate change draws invasive species to the Arctic

February 27, 2018 — The Arctic is changing. Temperatures are increasing twice as fast as the global average and sea ice is retreating quicker than predicted.

It is now just a question of time before the Arctic becomes ice free in summer.

But while we humans react slowly to the problem at hand, evidence suggests that animals are on the move- on land, sea, and in the air. And in the cold Arctic, invasive species are drawn to regions where they could not previously have survived.

But invasive species pose a big problem for native animals, whose numbers can decline to the point of collapse. They also pose a threat to fisheries, with economic consequences on both a local and global scale.

In fact, our recent study showed that blue mussels have become much more common in the Arctic in recent years, just like other exotic species of bluefin tuna and killer whales.

Read the full story at Phys.org

 

To get good credit, Alaska’s fishing towns may have to factor in climate change

February 15, 2018 — Late last year one of the world’s largest credit rating agencies announced that climate change would have an economic impact on the U.S.

Moody’s suggested that climate risks could become credit risks for some U.S. states.

Even though Alaska is warming nearly twice as fast as the rest of the U.S., its credit rating doesn’t seem to be in danger. But take a closer look at some of the state’s coastal communities and the story changes, especially when Alaska’s fishing towns consider adding climate risks to their balance sheets.

Frank Kelty is the mayor of the Unalaska, a tiny town is on an island sandwiched between the Bering Sea and the Gulf of Alaska, near some of the richest fishing grounds in the world.

Kelty has been there for 45 years, and lately, he’s seen a lot of changes.

“We’ve had a huge increase in humpback whales coming right into the inner harbor by the road system. Just hundreds of them hanging around,” he said.

People have been pulling off of the road to watch what he calls the “whale show.”

Read the full story at KTOO

 

Ocean Acidification Threatens Our Shellfish

February 2, 2018 — The Massachusetts legislature is current considering a number of bills regarding ocean acidification. If passed into law, the bills will establish a special commission or task force to study the effects of coastal and ocean acidification on coastal communities, fishing and aquaculture industries, and local commercially-harvested species. These bills come at a very critical time when what we do or don’t do next to address the effects of ocean acidification could very well alter the Commonwealth’s culture and economy.

What is ocean acidification?

Excess carbon dioxide in our atmosphere from the burning of fossil fuels is driving climate change and along for the ride is increased global temperatures, rising sea levels, and increased storm intensity. We hear about it almost daily. But on a planet that’s 70 percent ocean, what’s happening below the waves? They call it global warming’s evil twin: ocean acidification.

Much like the atmosphere, the ocean is absorbing more and more carbon dioxide. As a result, ocean temperatures are not only rising, but the actual chemistry of the ocean is changing. Research estimates that the ocean has become 30 percent more acidic since the Industrial Revolution. In particular, the Gulf of Maine is especially vulnerable because its colder waters can absorb more carbon dioxide than other ocean areas. Massachusetts’ bays and sounds are among those waters impacted by ocean acidification.

Why do we need to act?

Ocean acidification should be very alarming to Massachusetts and its legislators because it poses a grave threat to the Commonwealth’s shellfish fisheries – the most valuable in the Commonwealth. Increased ocean acidity interferes with the ability of shell-forming organisms such as clams, mussels, and oysters to build and maintain their calcium carbonate shells. The planktonic larval stages of many species are also vulnerable, a concern for hatcheries and wild populations of shellfish.

Read the full story at TalkingFish

 

GLOUCESTER TIMES: Lobster industry’s discipline staves off collapse

February 1, 2018 — Conservation pays off.

For years, lobstermen in the Gulf of Maine have been returning large and egg-bearing females to the water, instead of selling them for a short-term profit. The long-held practice, called “v-notching” because the females’ tails are marked to alert other lobstermen of their fertility, has kept the lobster stock healthy. A 5-pound lobster can produce another thousand lobsters in its lifetime, fisheries scientists say. A 1.5-pound lobster produces about 100. The last several years have been some of the most profitable in the industry’s history.

Now, it looks like those years of self-restraint are going to help the industry weather a new challenge — climate change.

In a report released late last month, scientists predicted the Gulf of Maine lobster population will drop as much as 62 percent over the next 30 years. The change is coming as the waters warm, making it more difficult for baby lobsters to survive. That’s the bad news.

The good news is that the conservation efforts used over the past several decades by lobstermen from Rockport and Gloucester to the state of Maine fostered exponential growth in the lobster population. Ironically, the warming waters also helped, until the temperature rose past a healthy level for young lobsters.

Read the full editorial at the Gloucester Times

 

Study: Warming Gulf of Maine endangering lobster stock

January 24, 2018 — Is the lobster boom on the decline in the Gulf of Maine because of warming waters? A newly released study by a Maine-based marine research group suggests that is the case.

The study, released Monday by the Gulf of Maine Research Institute, touched on many of the same climate issues that have left researchers and lobster stakeholders anxious about the future.

“In the Gulf of Maine, the lobster fishery is vulnerable to future temperature increases,” GMRI said in the statement released with the study. “The researchers’ population projections suggest that lobster productivity will decrease as temperatures continue to warm, but continued conservation efforts can mitigate the impacts of future warming.”

The study, compiled with the University of Maine and NOAA Fisheries, said the anticipated decline highlights the need for vigilant conservation within the Gulf of Maine lobster fishery, especially since scientists say the gulf’s waters are warming faster than 99 percent of the rest of the world’s oceans.

Researchers said they expect the lobster population to decline from recent highs — GMRI pegs the peak year at 2010, when it estimated the Gulf of Maine lobster stock contained 518 million lobsters — to levels more in keeping with traditional lobstering years.

It estimates the population could shrink to about 261 million lobsters in 2050.

“The 30-year outlook for the Gulf of Maine fishery looks positive if conservation practices continue,” GMRI said. “In their 30-year projection, the researchers anticipate average populations similar to those in the early 2000s.”

Beth Casoni, executive director of the Massachusetts Lobstermen’s Association, said lobster stock assessments in the Gulf of Maine have shown the annual settlement of young lobsters — when they transition from floating in open waters as plankton to settling on the bottom to begin the seven- to eight-year stretch it requires to mature — has declined from previous assessments.

Read the full story at the Gloucester Times

 

Dr. Malin Pinsky: Changing ocean temps and what they mean for fish and people

WASHINGTON (Saving Seafood) — January 17, 2018 — Last Thursday, Dr. Malin Pinsky, a professor of ecology, evolution and natural resources at Rutgers University, gave a Bevan Series lecture on how fish have adapted to changing ocean temperatures, and the implications for fisheries and people. “Fish and Fisheries in Hot Water: (How) Do We Adapt?” was the second of ten planned lectures in the 2018 Bevan Series, which features experts discussing fishery and marine conservation issues. The series is hosted at the University of Washington in Seattle.

Read more about the Bevan Series here

Watch Dr. Pinsky’s lecture here

See more Saving Seafood coverage of the Bevan Series here

A description of Dr. Pinsky’s lecture is below:

The same ecological and evolutionary processes operate in marine and terrestrial environments, and yet ocean life thrives in a fluid environment that is dramatically different from what we experience in air. The ocean is, in effect, a 1.3 sextillion liter water bath with muted thermal variation through time and space and limited oxygen. In this talk, I will trace what I see as some of the important consequences for fish and fisheries, including a number of striking contrasts and similarities to patterns on land. Most marine animals have evolved narrow thermal tolerances and live close to their upper thermal limits, which makes them surprisingly sensitive to even small changes in temperature. I will show that fish and other marine animals have responded rapidly and often quite predictably to temperature change and temperature trends, across time-scales from seasons to decades. Finally, I will link these rapid ocean changes to their impacts on fisheries and on people. The tight feedbacks and lagged responses between fisheries and ocean dynamics create both immediate impacts and complex dynamics that can complicate management efforts. The magnitude and extent of climate impacts on fisheries imply the need for a new era of climate-ready management more fully informed by environmental dynamics and long-term trends.

Malin Pinsky, Ph.D., is an Assistant Professor in the Department of Ecology, Evolution, and Natural Resources and an Alfred P. Sloan Fellow in Ocean Sciences at Rutgers University. There, he leads a research group studying the ecology and evolution of global change in the ocean, including conservation and management solutions. He developed and maintains the OceanAdapt website to document shifting ocean animals in North America, a resource used by governments and NGOs for climate adaptation planning. He has published articles in Science, Proceedings of the National Academy of Sciences, Current Biology, and other international journal, and his research has received extensive coverage in the press, including the New York Times, Wall Street Journal, BBC, CBC, and National Public Radio. He has received early career awards and fellowships from the National Academy of Sciences, American Society of Naturalists, and the International Council for the Exploration of the Sea. Previously, he was a David H. Smith Conservation Research Fellow at Princeton University. He has a Ph.D. from Stanford University, an A.B. from Williams College, and roots along the coast of Maine.