Saving Seafood

USGS Challenges Simple Narrative Linking Menhaden to Osprey Decline

May 5, 2025 — The following was released by the Menhaden Fisheries Coalition:

A letter from the U.S. Geological Survey (USGS) sent last week to the House Natural Resources Committee indicates multiple environmental stressors—not just prey availability—are responsible for recent osprey reproduction issues in the Chesapeake Bay. The USGS’ conclusions challenge narratives pushed by menhaden fishery opponents, including a widely publicized study by Dr. Bryan Watts of the Center for Conservation Biology, which linked a decline in osprey reproduction in Virginia’s Mobjack Bay to reduced availability of menhaden.

Menhaden increase in osprey diets is statistically insignificant

Specifically, the USGS finds that the Watts et al. (2024) study did not demonstrate a biologically significant change in the proportion of menhaden in the osprey diet over time. The agency also noted that menhaden made up a slightly higher portion of the diet in 2021 compared to 2006–07, although the difference is statistically insignificant. “Although the proportion of Menhaden as a percentage of total diet in 2021 is numerically larger than the 2006–07 value, the two values are bounded by overlapping error bars, and are thus not different in a biologically meaningful way,” the letter stated.

“The amount of food delivered to young in a nest can be influenced by many factors, including prey abundance, access to prey, … increased predation risk, parental condition, brood size, and adverse weather conditions,” said the USGS letter, which was delivered on May 2. “Ecological systems such as this are complex and occur at large scales that make it difficult and sometimes not possible to measure and accurately estimate the influence of all contributing factors.”

Chesapeake osprey trends also seen around the country

Following bird conservation measures including the banning of DDT, the Atlantic Coast osprey population increased by nearly 600% between 1966 and 2022. In the Chesapeake Bay, it has increased by about 1800% since 1960. While scientists have observed a leveling off of osprey populations between 2012 and 2022, populations remain high by historical standards. Furthermore, the USGS reports that this trend has been observed in numerous other locations including Florida, South Carolina, North Carolina, and Delaware, as well as the Pacific Coast, raising serious questions about any impact from the menhaden fishery since there is no menhaden fishery in those locations.

Overfished Striped Bass also an important food source for osprey

The USGS also identifies striped bass as an important food source for osprey in parts of the Chesapeake Bay and notes that the status of this stock may influence osprey reproduction. “Preliminary observations made by USGS scientists during a 2024 Osprey nesting study in the vicinity of the Choptank River suggest Menhaden and Striped Bass may be the primary prey type there,” the letter states. It further explains that “the principal contributing factor to poor breeding performance was loss of young due to starvation,” likely caused by “limited prey capture and/or prey delivery to nests.” Additionally, the letter notes that “the USGS has included Striped Bass among the list of prey species captured and consumed by Osprey at some Chesapeake study sites,” and concludes that “many of the factors that affect the status of the Striped Bass stock in the Chesapeake could also have direct or indirect effects on Osprey reproduction.”

The Atlantic States Marine Fisheries Commission (ASMFC) has found that Atlantic striped bass are currently overfished, with spawning stock biomass below the sustainable threshold as of the most recent assessment. Over the past decade, recreational fishing—particularly in the Chesapeake Bay—has been the primary driver of striped bass mortality, accounting for the vast majority of total removals, including substantial losses from catch-and-release mortality¹. The ASMFC has repeatedly cited recreational release mortality as a major factor in the species’ decline² and has responded with new management measures aimed at rebuilding the stock by 2029³.Conversely, the Atlantic menhaden fishery has repeatedly been found to be healthy and sustainably managed. The most recent stock assessment by the Atlantic States Marine Fisheries Commission in 2022 found menhaden is not overfished and overfishing is not occurring. The fishery has been certified sustainable by the Marine Stewardship Council, the gold standard for seafood sustainability, since 2019.

Osprey nesting sites in the Chesapeake are now at a surplus

The USGS scientists reported that the number of breeding pairs in the Chesapeake Bay increased from approximately 1,450 pairs in 1973 to around 10,000 pairs in 2020—an increase of nearly 600 percent. “All estimates indicate that the density of breeding pairs of Osprey in the Chesapeake has grown substantially since the 1970s,” the letter states. It also notes that “there are many natural structures, duck blinds, and manmade platforms suitable for nesting Osprey in the Chesapeake,” and that “Osprey nesting sites in the Chesapeake are now at a surplus and unused platforms are frequently being taken over by Canada Geese.” While the letter does not conclude that the population has exceeded environmental limits, it acknowledges that “as a natural population regulation process,” higher osprey densities increase competition for limited resources such as food and nesting sites, and that “growth usually continues until the population reaches the maximum population size the environment can support.”

VIMS also found no clear relationship with menhaden

Last fall, scientists from the Virginia Institute of Marine Science (VIMS) also found that the Watts study did not “establish a clear relationship with menhaden abundance and availability.” Both the original Watts study⁴ and the VIMS rebuttal⁵ were published in the journal Frontiers in Marine Science.

The USGS findings make clear that osprey reproduction is shaped by a wide array of environmental factors—and that no single fishery can shoulder the blame. The letter shows that blaming the menhaden fishery for complex ecological trends in osprey populations oversimplifies the science and misleads the public. Moreover, the overfished status of striped bass—driven largely by recreational fishing—may also be a contributing factor.

Footnotes

¹ Atlantic States Marine Fisheries Commission. Atlantic Striped Bass Stock Assessment Update. October 2022.

² Atlantic States Marine Fisheries Commission. Amendment 7 to the Atlantic Striped Bass Interstate Fishery Management Plan. May 2022.

³ Atlantic States Marine Fisheries Commission. Addendum II to Amendment 7. January 2024.

⁴ Watts Bryan D. , Stinson Christine H. , McLean Peter K. , Glass K. Andrew , Academia Michael H. , Byrd Mitchell A. (2023). Prey provisioning and diet of Osprey in lower Chesapeake Bay: A comparative study. Frontiers in Marine Science.
https://www.frontiersin.org/articles/10.3389/fmars.2023.1284462/full

⁵ Latour Robert J. , Gartland James , Ralph Gina M. (2024). Commentary: Prey provisioning and diet of Osprey in lower Chesapeake Bay: A comparative study. Frontiers in Marine Science.
https://www.frontiersin.org/articles/10.3389/fmars.2024.1416687/full

Harmful algal blooms can be lethal for humans. Scientists wonder if they cause seabird die-offs, too

July 29, 2021 — Paralytic shellfish poisoning, caused by eating seafood contaminated with toxins from harmful algal blooms, can be deadly to humans. Now, using marine samples from Unalaska, scientists are trying to understand if those harmful algal blooms could also be responsible for seabird die-offs.

There’s not much data on how saxitoxin — a harmful compound produced by algal blooms that cause PSP — spreads through the larger food web. But in July, a group of biologists with the United States Geological Survey visited Unalaska to collect samples of plants and animals in hopes of learning more about how saxitoxin levels magnify and diminish as they move through the food chain, from phytoplankton to mussels and up to seabirds.

“We don’t really know how this toxin moves through the food web,” said Sarah Schoen, a USGS wildlife biologist that recently collected marine samples in Unalaska. “There’s still a lot of unknowns, but the more information we can collect about it, the more we’ll understand it.”

Schoen said the project started about five years ago when a major heat wave, known as “the blob,” hit the ocean. Around the same time, there was a die-off of an estimated million common murres — a northern seabird — from Alaska down to California.

Read the full story at KTOO

Federal Shutdown Halts Some Environmental Conservation Efforts, Slows Others

January 9, 2019 — Federal researchers in western Massachusetts study ways to protect migrating fish, backyard birds and urban trees. The government shutdown is keeping them home and away from their research.

The researchers work for agencies like the USDA Forest Service and the U.S. Geological Survey.

Curt Griffin heads the UMass Amherst Department of Environmental Conservation, where some of the scientists are based.

“It’s a very, very unfortunate event that our federal colleagues are caught up in this mess,” Griffin said. “And it’s not fair to them. It’s not fair to the public that they provide important services to. So it’s just a very broken system, and they’re caught in the middle.”

Read the full story at New England Public Radio

Trump Administration Wants to Cut Budget for NOAA, But Congress Unlikely to Accept

February 20, 2018 — SEAFOOD NEWS — Seafood News Editor’s Note: The story below lays out known facts about the cuts to the federal budget made by the Trump Administration. However, it is unlikely that Congress will accept these cuts.

The Trump Administration’s $4.4 trillion federal budget for next year takes some mean whacks to programs that affect fisheries.

Off the top, the spending plan unveiled on February 12 cuts the budget for the National Oceanic and Atmospheric Administration (NOAA) by 20 percent to $4.6 billion. Among other things, NOAA manages the nation’s fisheries in waters from three to 200 miles offshore, which produce the bulk of Alaska’s seafood landings.

It’s the cuts within the cuts that reveal the most.

NOAA Fisheries is facing a $110.4 million drop to $837.3 million, a 14 percent budget cut. That includes a $17.7 million decrease in fisheries science and management, a $5 million cut in data collection needed for stock assessments, a $5.1 million reduction in funding for catch share programs and a $2.9 million cut to cooperative research programs.

The proposals for NOAA law enforcement are even more severe – a decline of $17.8 million is a 25 percent budget reduction.

“The entire law enforcement reduction is coming from the agency’s cooperative enforcement program and will eliminate funding for joint enforcement agreements with law enforcement partners from 28 states and U.S. territories,” reported the Gloucester Times.

The National Weather Service, also under NOAA’s umbrella, is facing a $75 million slice off its $1 billion budget. It will axe 355 jobs, more than a quarter of the NWS staff, including 248 forecasters.

Trump also wants to cut $4.8 million from habitat and conservation programs, wiping out funding and grants for NOAA’s fisheries habitat restoration projects.

The Trump plan proposes gutting $40 million from NOAA climate change programs, which would eliminate competitive grants for research and end studies on global warming in the Arctic, including predictions of sea-ice and fisheries in a changing climate.

The national Sea Grant College Program, which conducts research, training and education at more than 30 U.S. universities, is again on the chopping block.

Funding for programs under the U.S. Geological Survey (USGS) that monitor earthquakes and volcanoes would each drop by 21 percent. The USGS water-resources program, which includes the national stream-gauge network, would be reduced 23 percent.

Trump proposes to cut the Environmental Protection Agency’s budget to $6.1 billion in 2019, its lowest level since the early 1990s and about 25 percent below the current mark.

The EPA budget also eliminates funding for climate-change research while providing $502 million for fossil energy research, an increase of nearly 24 percent.

Seafood sales also could be badly hurt by proposed deep cuts to food stamps, or Supplemental Nutrition Assistance Program (SNAP). Instead of shopping at grocery stores, under Trump’s plan recipients would receive boxes of shelf-stable commodity items such as powdered milk, juices, pasta, peanut butter, and canned meats, fruits and vegetables.

“Seafood is the only major food group that is not considered a USDA commodity. If the new food delivery platform is going to put an emphasis on commodity goods, then that will leave out lean, heart-healthy seafood,” said Linda Cornish, president of the Seafood Nutrition Partnership.

Closer to home, Trump also plans to stop federal funding for the Denali Commission, introduced by Congress in 1998 as an independent agency to provide critical utilities, infrastructure and economic support throughout Alaska.  The plan calls for a $10 million cut out of $17 million, with the difference going to an “orderly closure.”

The White House says that any state that can afford to pay its residents an annual dividend doesn’t need a “unique and additional federal subsidy” such as the commission, wrote longtime Alaska journalist Dermot Cole. Trump added that “the commissions’ effectiveness at improving overall economic conditions remains unproven.”

The FY19 budget, which goes into effect on October 1, now goes before Congress.

This story originally appeared on Seafoodnews.com, a subscription site. It is reprinted with permission.

 

NOAA, USGS and partners predict third largest Gulf of Mexico summer ‘dead zone’ ever

June 20, 2017 — Federal scientists forecast that this summer’s Gulf of Mexico dead zone – an area of low to no oxygen that can kill fish and other marine life – will be approximately 8,185 square miles, or about the size of New Jersey.

This would be the third largest dead zone recorded since monitoring began 32 years ago – the average Gulf dead zone since then has been 5,309 square miles.

The Gulf’s hypoxic (low oxygen) and anoxic (oxygen-free) zones are caused by excess nutrient pollution, primarily from human activities such as agriculture and wastewater. The excess nutrients stimulate an overgrowth of algae, which then sinks and decomposes in the water. The resulting low oxygen levels are insufficient to support most marine life and habitats in near-bottom waters, threatening the Gulf’s fisheries.

The Gulf dead zone may also slow shrimp growth, leading to fewer large shrimp, according to a NOAA-funded study led by Duke University. This could mean higher costs of large shrimp at the marketplace and an economic ripple effect on the Gulf shrimp fisheries.

“The Gulf’s summer hypoxic zone continues to put important habitats and valuable fisheries under intense stress,” said Rob Magnien, director of NOAA’s Center for Sponsored Coastal Ocean Research. “Although there is some progress in reducing nutrients, the effects of the dead zone may further threaten the region’s coastal economies if current levels remain.”

This NOAA-sponsored forecast is based on nutrient runoff and river discharge data from the U.S. Geological Survey. The forecast assumes typical weather conditions, and the actual dead zone could be disrupted by hurricanes and tropical storms.

This year’s predicted large size is due mainly to heavy May stream flows, which were about 34 percent above the long-term average and had higher-than-average nutrient loads. The USGS estimates that 165,000 metric tons of nitrate – about 2,800 train cars of fertilizer – and 22,600 metric tons of phosphorus flowed down the Mississippi and Atchafalaya rivers into the Gulf of Mexico in May.

Read the full story at the U.S. Geological Survey

These fish started life as boys. Now scientists aren’t sure what sex they are.

For male smallmouth bass, sex change is increasingly not an option. In the chemical-laced Chesapeake Bay watershed and in rivers up through New England, it comes with the territory.

Based on the latest U.S. Geological Survey on intersex fish, 85 percent of male smallmouth bass in waters in and around national wildlife refuges in the Northeast have developed “characteristics of the opposite sex.” That’s in addition to 90 percent of the species in some West Virginia waters and 50 percent to 100 percent in the southern stretch of the Potomac River. All of the affected fish had eggs where their testes should be, according to previous studies.

Why this is happening remains a mystery, says the lead author of a new study, despite the problem being detected more than a decade ago. “It is not clear what the specific cause of intersex is in these fish,” said Luke Iwanowicz, a USGS research biologist. “This study was designed to identify locations that may warrant further investigation.”

Read the full story from the Washington Post

UMass and USGS: Climate Change Affecting Fish And Wildlife In New England

June 30, 2015 — A new environmental report from UMass and the U.S. Geological Survey warns that climate change continues to affect New England fish and wildlife.

USGS ecologist Michelle Staudinger says the study confirms previous findings – that temperatures are going up in all seasons, and especially winter. That means there’s more rain and less snow, which changes the flow of streams in the spring.

Read the full story and listen to the audio from New England Public Radio