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Accurately measuring the sizes of marine fish populations is challenging because predation, reproduction, and fishing are constantly affecting those populations' numbers. To avoid overfishing, many commercial fishers rely on complex computer models that estimate current and historical fish population sizes. These models incorporate various biological factors, such as fish size, age distribution, and reproductive rates. Recently, a team of researchers examined decades of modeled predictions for 230 major commercially fished species. They discovered that the models often overestimated fish population sizes. And contrary to their expectations, the researchers found that accuracy did not improve as the data grew overtime. The team's discovery most directly suggests that ______