Introduction to stock assessment
Unit 3.1: Outputs
Model-based stock assessments can often be used to project how stocks could react to different management actions. Projections are usually short-term (for example, 2 to 4 years), but can also be long-term (for example, 20 to 40 years). The farther into the future projections look, the greater uncertainty becomes. Long-term projections are more useful for evaluating overall management strategies than for making short-term decisions.
Long description
Historical (black) and projected (red) spawning biomass for various catch levels. The length of each bar indicates the amount of uncertainty for each year. Note that as projections progress in years, uncertainty increases.
The results of projections can change as assumptions change (for example, about environmental factors or catch levels).
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