Ospreys and Menhaden: A Shared History of Abundance and Decline

Osprey in flight with a large adult menhaden fish.
Osprey carrying a large adult menhaden. Long Beach Island. August 14, 2016. Photo by Jim Verhagen.

Over the past twenty years, I’ve had the privilege of watching New Jersey’s osprey population more than double—from roughly 400 nesting pairs to over 800. While our work to protect and expand nesting habitat has played a role in their comeback, the true foundation of their recovery has been a healthy marine ecosystem and an abundance of prey.

In recent years, however, that picture has shifted. Brood reduction and declining productivity are becoming increasingly common, tied directly to the reduced availability of Atlantic menhaden in nearshore waters. Menhaden have a long history of heavy exploitation, and their scarcity today is once again testing the resilience of ospreys.

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Honoring Powerful Voices in Conservation: 2025 Women & Wildlife Awards

Collage of Women + Wildlife Awardees over past 15 years.

Since 2006, the Women & Wildlife Awards have honored powerful voices in conservation—from scientists and educators to policy advocates—who have helped restore bald eagles, brook trout, golden-winged warblers, and more across New Jersey. These leaders have preserved thousands of acres, launched statewide education initiatives, and inspired countless others to act.

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Photo from the Field: Starving at the Shore

 

A young osprey stands in its nest with a dead nestling behind it.
A six week old osprey nestling, emaciated with no adults present, stands next to its dead sibling (two fish left at nest during nest check). July 25.

Since my last post on June 25, where I said this year was shaping up to be a “terrible one” for ospreys in New Jersey has held true. Since then I’ve watched as nestlings are abandoned and left to starve by their parents and die from starvation via live streaming cameras. It is heartbreaking. We’re seeing nest failure rates higher than they have ever been in most coastal colonies. Even worse, many others monitoring ospreys in surrounding states are reporting similar outcomes. Atlantic menhaden—typically a staple in the osprey’s diet—are far less abundant this season.

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Ensuring More Terrapins Live to See Tomorrow

2025 Great Bay Terrapin Project Volunteer Student Intern Maxwell Ferrelli carefully measures an adult female terrapin.

Northern diamondback terrapin nesting season may be coming to end, but Conserve Wildlife Foundation’s Great Bay Terrapin Project volunteers are still hard at work. During the peak of their nesting season, in June and July, they drive up and down Great Bay Boulevard in Little Egg Harbor Township in search of terrapins crossing the road. 

Summertime is peak terrapin crossing season, with females coming to shore to lay their eggs in early to mid-summer and hatchlings finding their way back home in August. The problem is, they often end up on the road, where they run the risk of being crushed by passing vehicles. On Great Bay Boulevard, a coastal road with few speed limit signs and a great number of terrapins, this is especially troublesome. 

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Photo from the Field: Grim Outlook for Ospreys This Summer

A hatchling osprey with two unhatched eggs. June 13, 2025.

This year is shaping up to be a terrible one for ospreys in New Jersey. Early season surveys, which we began to conduct more of in recent years, after nor’easters and shortages of prey caused nesting pairs fail to produce young. These early surveys provide valuable data on the outcomes of nests and insight on nest failures.

This spring and early summer, we have observed a high number of nest failures in an area around Long Beach Island on Barnegat Bay. This has also been observed directly through live streaming osprey cams from Cape May to Oceanville and reported by some of our dedicated volunteers in other areas. Right now all signs point to lack of food, which either caused adults to abandon incubation or starvation of their young.

A crucial prey item for ospreys is Atlantic menhaden, a forage fish that is found in the ocean and estuaries. They are found all along the Atlantic coast and are widely considered to be the most important fish in the sea. Not only are they filter feeders but they are food for a very wide variety of wildlife, from humpback whales and dolphins to ospreys, loons, tuna and striped bass, etc. They are also a very valuable fish that is used as whole bait, meal (solids, mainly for use in aquaculture as food for farm raised fish) and oils. In 2016, over 323 million pounds of menhaden was landed in Virginia alone. In coastal Virginia, osprey populations have collapsed and the likely culprit is lack of prey. 

This spring adult menhaden were not very plentiful, especially after a nor’easter impacted the coast in late May. Observations of ospreys showed some were still catching menhaden but much smaller fish. Since then it has been a cascading effect of adult male ospreys not being able to find enough food to feed their mates and their young. When they can’t find food, they spend more time and energy searching and hunting and less time at their nests, leaving their mates to do more incubation and often times starving. This is when incubating females have to leave their nests and then their eggs or young are exposed to predators or harsh environmental conditions like extreme heat, which results in nest failure. There are still plenty of fish available to ospreys but fewer adult menhaden, which ospreys are more dependent upon, especially during this time of year when they are foraging more frequently to provide for their families. As a bioindicator species, ospreys showing us the shortage of menhaden in real time through the lens of their failed reproduction.

We hope learn the full extent of food stress on ospreys this year during upcoming nest surveys. For those who watch a nest or have a pair that nest near your home, you are encouraged to report osprey nesting activity online, via Osprey Watch. Since ospreys were recently upgraded to stable as their conservation status, we are concerned about their long term stability in a rapidly changing world. Your support to help us monitor ospreys during this time is crucial, as we do not receive any state or federal funding to carry out this important fieldwork.

Biologists on the Trail of Beach-Nesting Birds

The team observing nests through their scopes.

Only a short boat ride off the coast of Little Egg Harbor Township lies an undisturbed haven for endangered beach-nesting birds. The shorelines of Horseshoe Island and Holgate are fully-stocked with piping plovers, black skimmers, and many signs warning boaters not to land on the protected islands. Members of the public are not allowed into these highly-restricted areas, and the only people allowed to step foot there are a small group of biologists.

Todd Pover, Senior Wildlife Biologist at CWF, and his team travel to these islands throughout the nesting season to keep an eye on nests and collect data on them. They work in partnership with New Jersey Fish and Wildlife and Edwin B. Forsythe National Wildlife Refuge to get access to the refuge and record information. 

A day in the field starts with a visit to Horseshoe Island, a new and unique addition to the New Jersey off-shore landscape. What started as a small sandbar less than a decade ago has become a half-mile island that has been growing every year. While the new space is great for birds looking to start a family, the best part of the deal is that the island is free of mammalian predators like foxes, which are common nest destroyers. 

The walk around the island takes the team a few hours to complete, even after dividing up the work. They venture from point to point, stopping where nests and mating pairs had previously been observed. Most of the focus for this trip is on American oystercatchers, a special concern beach-nesting species, and piping plovers, which are endangered. At each stop, the researchers look for eggs and chicks at the nesting sites so they can be logged and development can be tracked. Sometimes the nests are destroyed or the chicks don’t survive, and that is also recorded. All of this data is stored in a database so that the success of each generation can be measured over time.

American Oystercatcher on Horseshoe Island.

Occasionally, the team will find a new nest, but the process is tricky. Sometimes, they’ll get lucky and the parents will be nearby, leading them right to the site, but other times, they have to follow tiny, sandy tracks to find the divots in the sand that beach-nesting birds scrape out for nests. 

“It’s like being a detective,” said Madison Patterson, one of the biologists.

One of the joys of the work for the crew is finding that a previously unsuccessful pair of birds had renested. Many of the individuals on the island are banded, especially the American oystercatchers, so it makes it easier to identify which bird is which. For the plovers, not only do they get bands, but names, too. On Horseshoe, a male named Secretariat seems to enjoy scurrying around the island, using his camouflage to hide from the researchers. But, the professionals that they are, they find him anyway and add him to their logs.

By noon, it’s time to get back on the boat and head to the next stop: Holgate, a Unit of the Edwin B. Forsythe NWR. Unlike Horseshoe Island, this location does have mammalian predators, as well as a large population of endangered least terns. It also has the largest number of piping plover pairs in New Jersey. 

Royal tern eggs.

All across the island, tern, skimmer, and plover eggs abound. Each step must be taken with the utmost care, as one wrong move can destroy a nest and take a toll on the next generation’s population size. That’s pretty serious: these species have been classified as endangered in the state for decades and the constant threat of habitat loss due to human activity makes it even harder for these birds to bounce back.

In the mid afternoon, the team finishes up their final bits of data collection and gathers back on the boat. As they return to the mainland, the sounds of squawking soften and the islands vanish into the distance. But they would not be gone long, for tomorrow would bring a new day, new trails, and new lives for the team to document.

For more information on CWF’s beach nesting birds project, visit our project page.

Investing in our Future [Terrapin] Stewards

Tiny terrapins, most only measuring a few inches in length, were introduced to their new marshy homes this May thanks to the Little Egg Harbor School District and Conserve Wildlife Foundation of New Jersey. For a few months, teachers and their students cared for the young turtles and, in doing so, gave them the extra boost that they needed to face life in the wild. 

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Photo from the Field: Union County Courthouse Falcons Banded

Earlier today, we joined our partners from Union County and NJDEP Fish & Wildlife to band the four young peregrine falcons produced at the Union County Courthouse in downtown Elizabeth. The four eyases are right around four weeks old and prime age for banding. After ascending to the roof, viewers of the live stream on YouTube watched as we carefully bagged each nestling and brought them inside the building.

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One, Two, Three, FOUR! Fluffy Peregrines

We’re thrilled to see the fourth and final peregrine falcon egg hatch atop the Union County Courthouse in Elizabeth via the Union County Falcon Cam. The nest is now bustling with activity as proud parents Frida and Mango care for their four fluffy eyases.

The first three chicks, now nearly a week old, are growing rapidly—peregrine falcon chicks can double their weight within just six days of hatching. The newest hatchling, only a day old, is already being attentively brooded and fed by the adult. At this early stage, the chicks are covered in soft white down and rely entirely on their parents for warmth and nourishment.

Over the coming weeks, these eyases will continue to grow quickly, developing juvenile feathers and strengthening their muscles in preparation for fledging. Typically, peregrine falcons fledge around 6 to 7 weeks of age, so we can expect these chicks to take their first flights in early to mid-June.

Stay tuned to the Union County Falcon Cam to witness these remarkable developments in real-time. It’s a fascinating glimpse into the life cycle of one of nature’s most formidable aerial predators!

Duke is Back! A New Chapter Begins at the Barnegat Light Osprey Cam

Exciting news for osprey watchers—Duke has returned! This morning, the longtime male of our Barnegat Light Osprey Cam returned to his home on Long Beach Island after an incredible journey south for the winter. After months of migration, crossing thousands of miles between New Jersey and the tropics, Duke is back to reclaim his territory. But this year, there’s a twist—a new female is waiting for him!

His previous mate, Daisy, has not yet been spotted, and while we don’t know much about this new female (since she’s unbanded), we’ll be closely observing her iris and feather patterns to track her identity. Today, Duke wasted no time settling in—he was seen feeding on his perch, interacting with the newcomer, and lounging in the nest bowl (classic Duke). If Daisy doesn’t return, he will likely form a new pair bond with this female, marking a fresh chapter in his long and successful life.

At 19 years old, Duke is the oldest known nesting osprey in New Jersey—a testament to how far conservation efforts have come. Ospreys are living longer, healthier lives, a reflection of improved environmental policies and protections. Stay tuned as we watch this season’s drama unfold—will Daisy return, or will Duke start anew?