Saving Seafood

Late-season Arctic research cruise reveals warm ocean temperatures, active ecosystem

November 12, 2020 — Arctic researchers Jacqueline Grebmeier and Lee Cooper have been visiting the Bering and Chukchi seas off Alaska for nearly 30 years, collecting information about the biological diversity of the watery world under the sea ice to understand how marine ecosystems are responding to environmental changes. This year, a late-season research cruise in October revealed a surprise. At a time of year when an ice-breaking ship is usually required to get them to some of the data-gathering outposts, scientists found nothing but open water and an unusually active ecosystem.

“The water and air temperatures were warmer, and we had ecosystem activity that normally doesn’t occur late in the season,” said University of Maryland Center for Environmental Science Research Professor Jacqueline Grebmeier, chief scientist on the research cruise and a national and international leader in Arctic research.

Grebmeier and Cooper were part of a small team of researchers from the University of Maryland Center for Environmental Science, the University of Alaska Fairbanks, and Clark University that completed an unusual late-season Arctic research cruise due travel challenges presented by COVID-19 pandemic. They found an ecosystem—expected to be powering down to low-level winter activity with sea ice forming—to be still active, likely due to unseasonably warm ocean temperatures. Sea ice formation was still a number of weeks away.

“2020 turned out to be the second lowest minimum sea ice extent, meaning that sea ice retreated back closer to the North Pole,” Grebmeier said. “We had warming water up to 3 degrees Celsius higher than typical all the way through . That means you can’t cool it down that quickly to build ice.”

Read the full story at PHYS.org

U.S. coral reefs’ health assessed for the first time on a national scale

November 11, 2020 — The following was released by NOAA:

Coral reefs in both the Pacific and Atlantic oceans received a “fair” score in the first-ever condition status report for U.S. coral reefs released by NOAA and the University of Maryland Center for Environmental Science (UMCES) today. While the overall scores were “fair,” the report highlights coral reefs are vulnerable and declining. This is the first time coral reefs in all U.S. states and territories have been assessed using standardized monitoring data, creating datasets that offer a baseline of coral health on a national scale.

The U.S. Coral Reef Condition Status Report was developed by NOAA’s National Coral Reef Monitoring Program and UMCES’s Integration and Application Networkoffsite link using data collected between 2012 and 2018. The scores are denoted as “very good,” “good,” “fair,” “impaired,” and “critical.” The report was based on four categories when assigning a score: corals and algae abundance, reef fish populations, influence of climate on coral reefs, and human connections to reefs.

“Considering the more than $3.4 billion in annual economic benefits of coral reefs, these reports and the policy actions that they will inform are critical to our American Blue Economy,” said retired Navy Rear Adm. Tim Gallaudet, Ph.D., assistant secretary of commerce for oceans and atmosphere and deputy NOAA administrator.

Coral reefs near higher density human populations are degraded, which is likely due to local stressors including land-based sources of pollution and damaging impacts from fishing.

“To conserve and restore coral reefs, we need to understand the overall condition of these  ecosystems,” said Jennifer Koss, director of NOAA’s Coral Reef Conservation Program. “This report represents a snapshot of reef condition and is a great resource for communities and decision-makers throughout the nation. We hope the report starts a dialogue about the various factors and potential solutions to the threats affecting coral reefs.”

Greatest among the threats to coral reefs is climate change, according to the report. Warmer, more acidic seawater is negatively affecting coral reefs globally, no matter how remote they are.

“These status reports clearly show the impacts people are having on coral reef ecosystems,” said Heath Kelsey, director of UMCES’s Integration and Application Network. “Our work in the Pacific and Atlantic Oceans shows a dire outlook for coral reef ecosystem health, from warming ocean waters, fishing, disease, and pollution from the land. Of all of these, climate change is the single biggest threat to shallow water coral reefs in the U.S., and worldwide.”

Read the full release here

Study: Bay Rockfish Die at Twice the Rate of Those in Atlantic

May 18, 2020 — Striped bass that stay year-round in the Chesapeake Bay are dying at nearly twice the rate of those that migrate each year to the Atlantic Ocean, a new study has found. The cause or causes aren’t clear, but the lead researcher said that it needs to be addressed to right a troubling decline in the prized finfish.

An electronic tagging study led by scientists from the University of Maryland Center for Environmental Science found that large mature striped bass leave the Bay every year to roam coastal waters until the next spring. Those smaller, younger fish that remain in the Chesapeake died off at the rate of 70% a year.

“The mortality rate is alarming,” said Dave Secor, a professor at the UMCES Chesapeake Biological Laboratory in Solomons. “If fish are dying at greater than 50% or 60% a year, that’s a problem.”

The study, published Thursday in the journal PLOS One, appears likely to draw further attention to disease and overfishing, two suspects in the decline of striped bass, also known as rockfish, which are among the most sought-after fish in the Chesapeake and along the Atlantic coast.

UMCES scientists implanted acoustic transmitters in 100 striped bass from the Potomac River and tracked their movements over four years. Signals emitted by their tags were picked up as they swam by receivers stationed in the Bay and along the coast — a kind of E-Z Pass network for fish, as Secor described it.

Read the full story at the Chesapeake Bay Magazine

Large rockfish leave Chesapeake Bay to become ocean migrators

May 15, 2020 — A new electronic tagging study of 100 Potomac River striped bass sheds light on rockfish migration in Chesapeake Bay and the Atlantic Coast. University of Maryland Center for Environmental Science researchers found that when rockfish reach 32 inches in length they leave Chesapeake Bay and become ocean migrators. Small fish stayed in the Bay had higher mortality rates than those that undertook ocean migrations.

“Knowing the size at which they leave, we can do improved management that is tailored better to commercial and  sectors those related to catch and size limits,” said study author and Professor Dave Secor of the University of Maryland Center for Environmental Science. “It allows us to bring different parts of the fishery into an assessment model to evaluate stock health and test how effective regulations will be.”

Chesapeake Bay striped , also known as rockfish, (Morone saxatilis) were implanted with two-inch acoustic transmitters and their coastal shelf migrations recorded over a four-year period by telemetry receivers throughout the Mid-Atlantic shelf waters and southern New England. Researchers found that only large striped bass from the Chesapeake Bay migrate to ocean waters when they reach 32 inches in length, and smaller fish remain resident to the Chesapeake Bay, regardless of sex.

Read the full story at PHYS.org

MARYLAND: Override of Hogan veto sets new course for MD oyster management

February 3, 2020 — Overriding a veto by Gov. Larry Hogan, Maryland lawmakers enacted legislation Thursday requiring a more consensus-based approach to managing the state’s beleaguered oyster population.

The new law is the latest round in a years-long tug of war between the Hogan administration and legislators over oyster management. It directs the Department of Natural Resources to work with scientists, mediators and an expanded roster of stakeholders to seek agreement where little has existed to date on how to increase the abundance and sustainability of the Chesapeake Bay’s keystone species.

The bill cleared the House by a vote of 95 to 43. That was a few votes less than it got when originally passed last year but still more than the three-fifths majority needed for a veto override. The Senate quickly followed suit, voting 31-15 to make it law despite the governor’s objections.

Supporters of the measure said it was needed to direct the DNR to revamp the oyster management plan it had adopted last year. Environmentalists and their allies in the General Assembly have complained that the administration has favored watermen’s interests in seeking to open oyster sanctuaries to harvest and is not moving forcefully enough to end the overfishing found in a 2018 scientific assessment.

Read the full story at the Bay Journal

Report: Pennsylvania must do more to help Chesapeake Bay

May 29, 2019 — A nonprofit that tracks pollution in the Chesapeake Bay lambasted Pennsylvania on Tuesday, saying that the state is failing to protect the nation’s largest estuary from farm manure and dirty stormwater.

The Chesapeake Bay Foundation released a report saying Pennsylvania’s plan to reduce pollution from farms and cities is “woefully inadequate” and underfunded by about $250 million a year.

The foundation also warned that the Environmental Protection Agency has failed to keep Pennsylvania on track. It’s one of six states, along with the District of Columbia, federally required to significantly reduce bay pollution by 2025.

“If EPA does not hold Pennsylvania accountable, CBF and others must consider legal action,” foundation President William C. Baker warned in a news release.

Pennsylvania officials said the foundation’s assessment is inaccurate and failed to account for all of the state’s efforts. The EPA said in its own statement that Pennsylvania has made “significant” progress.

The foundation’s report is the latest note of caution about the Chesapeake Bay’s health, which appears to be improving after decades of unbridled pollution.

In recent years, the story of the 200-mile-long (325-kilometer-long) bay has mostly been about signs of recovery. Underwater grasses are spreading. Oxygen dead zones are shrinking. The latest survey of blue crabs showed the highest estimates in seven years.

But environmentalists say more work is needed and threats like climate change still loom. Last year, a punishing cycle of downpours led to increased pollution in the bay, according to a recent report from the University of Maryland Center for Environmental Science.

Read the full story at the Associated Press

UMCES report: Low health scores rain on Chesapeake Bay’s recovery

May 23, 2019 — A year of historically heavy rainfall strained the Chesapeake Bay’s ecosystem — but not past the breaking point, according to a wide-ranging assessment released Tuesday.

The estuary’s overall health score in 2018 dropped from 54% to 46% but retained its “C” grade for a seventh consecutive year, according to the University of Maryland Center for Environmental Science’s latest report card.

It marked the lowest grade since 2013 and reversed a streak of four years of improving or steady scores.

“We don’t have as good of news to report because of some record rainfall,” said Bill Dennison, UMCES vice president for science application. “The good news is it took a hit, but it did not crash.”

The federal government and the states within the 64,000-square-mile Bay watershed are working on a plan to reduce nutrient and sediment pollution under an agreement signed in 2010. The effort faces a 2025 deadline.

The resilience of that recovery faced one of its biggest tests last year. About 72 inches of rain inundated the Baltimore area during 2018, about 30 inches more than normal, according to the report.

From a scientific perspective, the deluge offered a glimpse of how the recovering ecosystem may respond as climate change leads to increasingly erratic weather, Dennison said.

Many scientists predicted that last year’s rains would dampen the restoration gains. The UMCES report bears out those projections, showing reductions in the scores for water clarity, nitrogen, phosphorus and aquatic grasses.

Read the full story at the Bay Journal

Chesapeake Bay health dips, but still rates a C in annual report card

May 22, 2019 — Bay health took a hit from record rainfall last year, but experts claim the Chesapeake’s growing resilience managed to keep a bad situation from getting worse.

The 2018 Chesapeake Bay Report Card was released by the University of Maryland Center for Environmental Science, one of several groups that assess the bay’s health each year. It put the bay’s overall score at 46% — a drop from the previous year’s 54%, but still a C on its 20-point grading scale.

Bay resilience is critical because very wet years may no longer be an anomaly. Climate models predict an increase in weather extremes, and local marine experts are seeing some evidence of that.

“We’re encouraged that, in spite of the fact that we had a major insult to the bay with all the runoff and rainfall in 2018, that we took a dip but we didn’t crash,” said Bill Dennison, vice president for science applications at the center.

“Many of the living resources appear to be fairly resilient,” said Mark Luckenbach, associate director for research and advisory services at the Virginia Institute of Marine Science. “But we need to understand that that’s likely to become more frequent — these really high rainfall events.”

VIMS, affiliated with the College of William and Mary, collected much of the data used to compile the report, particularly for bay-wide seagrass, Virginia fish and blue crabs.

Read the full story at The Daily Press

Healthy fisheries and aquatic grasses fuel Chesapeake Bay recovery

June 19, 2018 — Booming aquatic grasses and bellwether fisheries are driving sustained progress in Chesapeake Bay health, which experts say is finally showing “significant” overall improvement.

The 2017 Chesapeake Bay Report Card issued by Virginia and Maryland rates the estuary a C for the third straight year as recovery holds steady or improves in five of seven indicators, the James River nails a B- for the first time and the fisheries index scores its first-ever A+.

Experts call their assessment “important evidence that the positive trend in ecosystem health is real” and that cleanup efforts across the watershed are working.

“It is the first time that the … scores are significantly trending in the right direction,” said Bill Dennison at the University of Maryland Center for Environmental Science in a statement Friday. “We have seen individual regions improving before, but not the entire Chesapeake Bay.”

The UMCES compiled the report card along with the Virginia Institute of Marine Science in Gloucester Point, the Virginia Department of Environmental Quality and other governmental agencies and academic groups both in this state and Maryland. This is the 12th year of its release.

The fisheries index is comprised of the average score for blue crab, striped bass and bay anchovy indicators. These species are considered ecologically, economically and socially important to the bay.

Last year’s fisheries index was 90 percent. This year, it rose to 95 percent, the highest ever recorded for the annual reports — the average of 100 percent for striped bass and blue crab, and 84 percent for bay anchovy.

Read the full story at the Daily Press

 

Big decision looms over little oily fish that feeds so many others

Fishery managers eye whether to weigh ecological role of Atlantic menhaden in setting harvest limits

October 12, 2017 — If you were to round up all of the menhaden swimming along the Atlantic coast and somehow put them on a scale, they’d weigh in at about 1.2 million metric tons.

To visualize that, imagine 220,000 Asian elephants stampeding along the coast — about five times more than exist in the world. For menhaden, though, that equates to tens of billions of tiny fish. This fall, fishery managers will tackle the question of whether that’s enough.

An update on the status of Atlantic menhaden released in August found the population robust. The current biomass, combining their number and weight, is the greatest that scientists have estimated in the last four years — and more than was seen anytime from 1992 through 2007.

Menhaden are not overfished, the report concluded — fewer than 200,000 metric tons were caught last year.

But critics, including some scientists and many conservation groups, say those figures only tell part of the story. Menhaden should not be looked at in isolation, they say, but as part of the broader marine ecosystem, where the small, oily fish is an important food for other fish, whales, sea birds and a host of other species.

“We’re probably not going to damage the menhaden stock all that much by continued heavy fishing. It seems to be in reasonably good shape,” said Ed Houde, a fisheries scientist with the University of Maryland Center for Environmental Science. “But what happens to the rest of the ecosystem? That’s the question mark.”

In November, the Atlantic States Marine Fisheries Commission, a panel of state fishery managers that regulates catches of migratory fish along the coast, will grapple with whether it should continue to manage menhaden as a single species — or begin considering its value to the ecosystem as well.

Read the full story at the Bay Journal