In elementary school, we learned through basic math that 1 + 1 = 2 and 2 x 2 = 4. As we grew up, math became more complicated with different variables and formulas, but we always knew that 1 + 1 = 2 and 2 x 2 = 4. Fisheries math is not all that different.
Each year, scientists at the National Oceanic and Atmospheric Administration use fishery math and science to determine how many fish can be removed from fisheries in a sustainable manner, and the number of fish that can be removed is called the annual catch limit (ACL). If species fall below a level that is sustainable, managers put in a rebuilding plan – a roadmap to rebuild the stock to a healthy level.