The 2023 Status of Stocks report illustrates the challenges of managing U.S. fisheries sustainably in an era where climate change is not down the road—it has already arrived. Overfishing remains a persistent issue, and rebuilding efforts continue to fall short of needed progress. To make rebuilding plans effective and restore healthy conditions, NOAA Fisheries must prioritize ecosystem considerations. Adapting management approaches to incorporate the changing climate and shifting ocean conditions is essential for the long-term health of our fisheries. Fishery managers, scientists and the fishing industry must work collaboratively to develop adaptive, ecosystem-based strategies that promote resilience and ensure fishing practices remain sustainable in the face of climate change.
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For many years, the United States has taken pride in its world-class fishery management infrastructure which seeks to maintain sustainable fishing and abundant fish populations that can provide us with food and support businesses, recreation and culture. But a recent report from the agency that manages our marine fisheries reveals that while some progress has been made in the past year, many fish stocks around the country are at concerningly low levels of abundance. Even more alarming is that the steps we are taking to try to rebuild those fish stocks are rarely having an impact. Particularly as climate change disrupts our ocean and puts our fishing communities at risk, fishery managers need to act decisively to reverse these trends.
Too Many Stocks are Still Overfished
NOAA’s Status of Stocks report, which is delivered every year to Congress, serves as a vital health check for U.S. fisheries. The 2023 report focuses on a few key metrics: the fish stocks currently subject to overfishing, the stocks that are overfished and the progress of rebuilding plans intended to bring previously overfished stocks back to healthy population sizes. These figures can give us insight into the effectiveness of existing management and areas where improvements are needed.
Overfishing occurs when fish stocks are fished harder than they can naturally replenish. The report notes that 6% of known stocks are currently experiencing overfishing. That’s an all-time low, which is good news; however, the number hasn’t budged much for a decade. Despite efforts to reduce overfishing, the trend reveals a concerning stagnation, particularly because some stocks, like greater amberjack in the Gulf of Mexico, have remained subject to overfishing for more than 20 years. If continued unchecked, overfishing leads to stocks becoming overfished, which threatens the livelihoods of communities that rely on fishing as well as our sustainable food supply of fish. which threatens our sustainable food supply and the livelihoods of communities that rely on them.
When a stock is declared overfished, it signifies that the population has declined to a level where it can no longer sustainably support fishing in the long term. A primary purpose of managing our fisheries is to avoid creating overfished stocks, not only because of the impact that has to the environment, but also because it can devastate fishing communities. Rebuilding a stock back to a healthy level once it’s overfished is difficult and includes restricting fishing while the population grows, which can take decades. The challenge of rebuilding is exacerbated by climate change, which adds further complexity to the problem. Shifting ocean temperatures, changing currents and acidification are just a few of the impacts that make it even harder for overfished stocks to recover. At the same time, rebuilding stocks is more critical now than ever before because abundant and resilient stocks are better able to handle these climate impacts.
Efforts to Rebuild Stocks are Struggling
When a stock becomes overfished, managers must put a rebuilding plan in place for restoring its size back to target levels. These plans typically involve reducing catch limits and implementing other strategies that allow the stock size to grow. The 2023 Status of Stocks report celebrates a milestone, marking the 50th stock rebuilt since 2000 with the Snohomish coho salmon. However, this figure only tells part of the story. Rebuilding progress has been stalling out—just three stocks have been rebuilt since 2019—and the number of stocks in rebuilding plans has increased and is now up to 48. Furthermore, 11 of the 50 rebuilt stocks being celebrated in the report have since become overfished again, with nine still in the process of rebuilding a second time. This indicates that fishery management is failing to keep stocks at healthy levels and struggling to recover them when they decline into being overfished.
As seen from the figure above, rebuilding progress has tapered off since the early 2010s. Ideally, what we would see is the total number of rebuilt stocks rising, and the number of overfished stocks falling. That had been happening until about 2017, when the number of overfished stocks started rising and the number of rebuilt stocks stayed relatively flat. This pattern is troubling, underscoring a critical need for improvement.
Rebuilding is Critical to Build Resilience to Climate Change
The reality is that rebuilding is becoming both increasingly important and increasingly difficult. A changing climate complicates traditional management approaches, which rely on the assumption that the future will look (roughly) like the past. Yet, climate change doesn’t change the reality that managers, scientists and fishermen must still work together to bring stocks back to target population sizes when they are overfished. And climate change is far from the only factor that can explain shortcomings in rebuilding progress. Fishery managers need to do more to end overfishing on overfished stocks and put plans in place that are robust enough actually to rebuild successfully.
These conditions highlight the urgency of improving data collection and incorporating climate and ecosystem considerations into management measures. Yet, despite this need, only 8% of 2022 stock assessments—the primary vehicle by which a stock’s health is determined—included ecosystem measures. Furthermore, a report by the GAO found that only a quarter of fishery management plans considered “climate-related information.” This lack of climate-change preparedness impedes rebuilding efforts, as strategies that don’t account for climate-related impacts risk further stagnation of and decline in the health of our fisheries. These concerns are compounded by the fact that, of the 506 stocks managed by NOAA, we only know the overfishing status of 72% and the overfished status of 52% of them. That means that, in addition to inadequate climate data, there is significant uncertainty regarding the baseline health of hundreds of our fish stocks.
The post Navigating Troubled Waters: Breaking Down the 2023 Status of Stocks Report appeared first on Ocean Conservancy.
Navigating Troubled Waters: Breaking Down the 2023 Status of Stocks Report
Ocean Acidification
Dr Heidarzadeh’s TV interview with SkyNews on the massive M7.7 Panama earthquake on 9 October 2026
Dr Heidarzadeh’s TV interview with SkyNews on the massive M7.7 Panama earthquake on 9 October 2026. Click here for the full story.
Dr Heidarzadeh’s TV interview with SkyNews on the massive M7.7 Panama earthquake on 9 October 2026
Our ocean is an incredibly vast and mysterious place. And there is no place where that is more evident than the deepest ocean area in the world: the legendary Mariana Trench. Located east of the Philippines, the Mariana Trench lies in the Mariana Archipelago in the western portion of the North Pacific. The greater area of the Mariana Trench Marine National Monument is made up of more than 95,000 square miles of ocean. Beneath these waters lie incredibly complex aggregations of submerged islands and volcanoes … and of course, an astoundingly massive trench.
Dive in with us to have your biggest questions answered about the famed Mariana Trench.
How deep is the Mariana Trench?
The deepest part of the Mariana Trench, known as Challenger Deep, is almost 36,000 feet below the ocean’s surface. For context, Mount Everest is about 29,000 feet above sea level, so the Mariana Trench is about 7,000 feet deeper than Mount Everest is tall. For one more comparison, the RMS Titanic lies at a depth of about 12,500 feet below sea level. The Challenger Deep is in waters nearly three times deeper than this ship’s final resting place.
Due to its enormous size, the Mariana Trench has at times been affectionately nicknamed the Grand Canyon of the ocean. This is certainly a picturesque image, but don’t let the mammoth size of this U.S. national terrestrial park fool you into thinking the Mariana Trench matches its size. The trench’s footprint is estimated to be 120 times larger than the Grand Canyon’s, and to reach the bottom of Challenger Deep, you’d need to descend through almost six Grand Canyons stacked on top of each other before you’d reach the seafloor.
Oh … and did we mention it’s five times wider than it is deep? It’s about 43 miles wide!
What is Challenger Deep, and how long would it take to reach it?
Challenger Deep is the deepest point of the Mariana Trench. Fewer than 30 people have ever journeyed to this area. The trek below the surface is long, dark and time-consuming, and it’s not an expedition considered lightly by scientists and explorers.
The first people to descend into the depths of this area in 1960 were oceanographers Jacques Piccard and Don Walsh, and it took them close to five hours to reach Challenger Deep. Since then, more advanced submersibles have been created, but it still takes two to four hours for modern vessels to reach such depths. For example, explorer and filmmaker James Cameron reached the seafloor in a little more than 2.5 hours in the first documented solo submarine dive to the area, and it took oceanographer Dr. Dawn Wright about four hours in 2022. It is crucial that these submersibles descend slowly and steadily beneath the surface, as the immense water pressure compounds with every mile a submersible descends. Speaking of pressure …
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What is the water pressure at the bottom of the Mariana Trench?
If you thought the depth of the Mariana Trench was its only jaw-dropping feature, think again. Water pressure is one of the most important factors affecting deep-sea life. In the ocean, pressure increases by one atmosphere for every 33 feet (10 meters) of depth. One atmosphere (a unit of measurement for pressure equivalent to average air pressure at sea level) is equal to about 14.7 pounds per square inch (PSI), which is the approximate standard atmospheric pressure at sea level. If you were to convert atmospheric pressure into weight, one atmosphere is about the weight of a bowling ball. Stay with me, friends.
If a vessel were to dive 2,000 feet below the surface, the pressure would equal that of 60 bowling balls stacked atop every square inch of that submersible. But 60 bowling balls is simply nothing compared to the pressure in the Mariana Trench. The atmospheric pressure at the depths of Challenger Deep is equal to about 16,000 PSI. That pressure is about the same as the weight of an entire full-grown elephant on every square inch of a submersible!
Need a more extreme comparison? If a human were to be placed at the bottom of the Mariana Trench, the pressure would be equal to that of 50 jumbo jets piled on top of a person!
Do any animals live in the Mariana Trench?
The depths of the Mariana Trench come with immense pressure and extreme darkness, but somehow, life finds a way to survive. Organisms that live at an extreme depth, like that of Challenger Deep, have to be highly adapted to low temperatures (typically just above freezing), high pressure and virtually no light at all.
Species found in the depths of the Mariana Trench might look vastly different from animals from other ocean depths because their anatomy has been refined to thrive in harsh conditions. At such great depths, these animals typically depend on chemosynthesis (using nutrient-rich waters being pumped out of hydrothermal vents) or descending detritus (dead matter that has fallen from higher parts of the ocean) for food, such as whale falls. Just a handful of these animals include species of octopuses and squids, sea cucumbers, amphipods, sea jellies, shrimp, sea worms and some wild-looking fish!
In 2025, more than 7,000 new species were discovered in the Mariana Trench, including the hadal snailfish (Pseudoliparis swirei). This is the deepest-dwelling fish currently known to science. Now, the fish has been dubbed “the Mariana snailfish.”
How was the Mariana Trench formed?
The process by which the Mariana Trench was created is a geologically fascinating one known as subduction. On the Earth’s surface, there are thin plates that cover the planet’s mantle, which is made of molten rock. If two of these plates collide, one pushes down into the Earth’s mantle while the other is pushed over the bottom plate. When this happens, a trench is formed from the drag of the bottom plate. This process can sometimes create incredibly strong earthquakes. The plates that forged the Mariana Trench’s creation are estimated to be up to approximately 180 million years old.
This trench was unknown to scientists until 1875. It was then that a team of explorers on the HMS Challenger measured the depth of the sea by simply lowering a weighted rope into the water. They were baffled when they measured that first portion of the seafloor to be five miles below the surface. And so was born the origin of some of the most daring deep-sea explorations known to mankind to date.
Is the Mariana Trench protected?
The Mariana Trench is in waters off Guam and the Mariana Islands. The region is protected from some human activities under its status as a marine monument. The creation of the Mariana Trench Marine National Monument signified that international, national and local leaders all recognize the importance of protecting this area.
However, just because the region is protected does not mean it’s not vulnerable to modern threats to ocean health. Plastic bags have been spotted in the Mariana Trench during several expeditions, highlighting the far-reaching impact of the marine debris problem. No corner of our ocean is safe from the ever-present threat of plastic pollution. The reality of a changing climate makes the future well-being of wondrous places like the Mariana Trench uncertain. What’s more: More than 70% of the global ocean has yet to be mapped. And what we don’t yet know about, we cannot wisely work to protect.
It’s up to us to work together to defend our ocean, from the sandy shores of our favorite beaches to the deepest, darkest parts of the sea. Together, we can work to protect our ocean as a whole, which ultimately helps protect treasured places like Challenger Deep.
Find out how you can join Ocean Conservancy’s wave of momentum to secure a healthy ocean and a thriving planet, forever and for everyone!
The post The Mysteries of the Mariana Trench appeared first on Ocean Conservancy.