Every year, fisheries managers are asked a deceptively simple question: How many fish are out there? It sounds straightforward until you consider the challenge. Fish live underwater, move constantly, and can spread across thousands of square miles of estuaries, rivers, sounds, and ocean waters. Unlike people, they don't fill out census forms. Yet management decisions depend on having an answer. That's where stock assessments come in. A stock assessment is the scientific process used to estimate the size, health, and trajectory of a fish population by bringing together decades of information from dozens of sources.
Think of it as a giant puzzle. No single piece provides the answer. Instead, assessment scientists gather clues from across the coast and fit them together to create the clearest picture possible.
The first clue comes from what fishermen catch. Commercial landings, recreational harvest, and released fish all help scientists understand what's being removed from a population each year. In North Carolina, commercial harvest information comes through the state's Trip Ticket Program, while recreational catch estimates come from coastwide angler surveys. But catch data alone can't tell the whole story. If anglers catch fewer fish this year than last, is the population declining, or did fewer people go fishing?
The second clue comes from long-running survey programs conducted at the same locations year after year using standardized sampling methods. These surveys provide an independent measure of whether fish populations are increasing, decreasing, or remaining stable over time, regardless of changing fishing habits, weather, or angler participation.
The final set of clues comes from the fish themselves. A fish's age, length, weight, reproductive condition, and even its diet reveal how fast it grows, when it begins reproducing, and how well the population can replace fish lost to harvest and natural mortality.
Together, these three streams of information begin to tell the story of a fish population, and gathering clues is only the beginning. Assessment scientists still have to combine all this information into sophisticated population models that estimate how many fish are in the water today and where the population may be headed tomorrow.
Turning Clues into Answers: From Model to Management Tool
By the time assessment scientists finish gathering catch records, survey results, and biological information, they've accumulated thousands of pieces of evidence. Their next challenge is turning those clues into answers. To do that, they build statistical population models that track fish throughout their lives, from the time they enter the population until they die from harvest or natural causes. The goal isn't simply to count fish, it's to understand how an entire population functions.
Using all of the available information, these models estimate several measures that scientists cannot observe directly, including total population size, biomass, recruitment of young fish, and fishing mortality. One of the most important is spawning stock biomass, the portion of the population made up of mature fish capable of reproducing. In many ways, it serves as the engine that drives the next generation of fish.
A stock assessment doesn't rely on just one measurement. Instead, it builds a comprehensive picture of a fish population using multiple indicators. Is the stock healthy? Is it growing? Is it declining? Is harvest occurring at a sustainable level? Much like a physician considers blood pressure, heart rate, cholesterol, and other health indicators before making a diagnosis, assessment scientists evaluate many different measures before drawing conclusions about the condition of a fish population.
No stock assessment is perfect. Fish live in a constantly changing environment, and every assessment depends on the quality of the information available. New data are collected every year, survey methods improve, and better computer models are continually developed. As our understanding of fish populations evolves, assessments must evolve with them. That's why it is critical that they're updated regularly, ensuring management decisions reflect the best science available rather than yesterday's understanding.
Of course, producing a stock assessment is only part of the story. By the time a management decision reaches the public, it's often supported by decades of field observations and the work of countless biologists, technicians, and assessment scientists. Strengthening these scientific foundations is one of the most important investments we can make for North Carolina's fisheries. That means improving the data that feeds stock assessments, developing new assessment techniques, and retaining the scientific talent needed to keep pace with changing fisheries.
Better science doesn't guarantee easy decisions, but it gives us the best chance of making the right ones.
From Science to Action: What Happens After the Assessment
Once scientists understand where a fish population stands, the next challenge is deciding what, if anything, should happen next. That's where North Carolina's fishery management process begins.
Every major coastal fishery is guided by a Fishery Management Plan, a long-term roadmap that blends science, public input, and management strategies to help ensure healthy fisheries for generations to come. The starting point is surprisingly straightforward. Scientists compare the results of a stock assessment against biological reference points, benchmarks that define whether a fish population is meeting its long-term management goals. While the science behind those benchmarks is complex, the conclusions often come down to two familiar terms: overfished and overfishing.
Although they sound similar, they describe two very different things. A stock is considered overfished when the population has fallen below the level needed to sustain itself. Overfishing, on the other hand, describes what's happening right now—fish are being removed faster than the population can replace them. A fishery can experience overfishing without yet being overfished, while an overfished population may require years to recover even after harvest has been reduced.
Those findings trigger a well-defined management process. When overfishing is occurring, state law requires managers to reduce fishing pressure. When a stock is declared overfished, a rebuilding plan with measurable goals and timelines must be developed. The specific management tools vary from one fishery to another and may include changes to seasons, size limits, bag limits, fishing gear, or harvest areas. Throughout the process, assessment results are reviewed, management options are developed, stakeholders provide input, and final decisions are made through a public process. Science provides the foundation, but management determines how those findings are put into practice.
For most people, that process remains hidden behind technical reports, unfamiliar terminology, and regulatory language. The science may be sound, but if the public can't understand what it means, it's difficult to have meaningful conversations about the future of our fisheries. Our Foundation believes good science should also be understandable. That belief inspired one of our most ambitious educational efforts: demystifying stock assessments and making the health of North Carolina's fisheries something everyone can understand.
From Assessment to Answer: FINDEX
Stock assessments were designed for scientists and fishery managers. For everyone else, they can be difficult to interpret. Take the terms overfished and overfishing. They have precise scientific definitions, yet they're often misunderstood. When people hear that a fish population is overfished, many assume fishermen are currently catching too many fish. When they hear overfishing is occurring, they often assume the population has already collapsed. In reality, neither conclusion is necessarily true. The terminology is scientifically accurate, but it isn't always intuitive.
Imagine bringing home a report card that simply said "passing" or "failing," with no grades attached. Most parents would want to know much more. Was the student barely passing or earning straight A's? Our fisheries deserve that same clarity. That's exactly why we created FINDEX®.
Several years ago, our Foundation asked a simple question: If a stock assessment tells us how a fish population is doing, why shouldn't everyone be able to understand the answer? That question became the springboard for our fisheries status index, which builds upon stock assessments rather than replacing them. Every FINDEX score begins with the same science used by fisheries managers, then translates those findings into a format anyone can grasp.
Rather than asking readers to interpret technical measures such as spawning stock biomass or fishing mortality, FINDEX compares each species against the biological targets established through the stock assessment process and reports the result as a simple percentage. Instead of wondering whether a fish population is "overfished," readers can immediately see how close that population is to where science says it should be. Whether the answer is 42 percent, 87 percent, or 118 percent, the meaning is instantly clear.
Traditional fisheries management is built around minimum standards. Is the stock overfished? Is overfishing occurring? Those questions are essential because they help prevent collapse, but they don't tell us what exceptional looks like. FINDEX asks a different question: What would it take to build world-class fisheries?
Perhaps most importantly, FINDEX defines what "world-class" actually means. The phrase is often used to describe exceptional fisheries, but it's rarely measured. FINDEX sets that benchmark by identifying fish populations that exceed their biological targets by more than 200 percent. It transforms "world-class" from an aspiration into a measurable standard, while recognizing every stage of progress along the way, from Depleted to Rebuilding, Stable, Robust, and ultimately World-Class.
Our goal wasn't to simplify the science. It was to simplify the conversation. For decades, fisheries science has been exceptionally good at identifying when populations fall below acceptable limits. FINDEX complements that science by measuring something equally important: how close we are to achieving the full potential of our fisheries. Good decisions begin with good information. Stock assessments provide the science, and FINDEX makes it understandable. Instead of asking whether a fish population has avoided failure, FINDEX asks how close it is to achieving excellence.