Why are precautionary buffers used when setting ACLs?

• A. To account for uncertainty in assessment data and model
• B. To increase catch authority for fishers
• C. To reduce the need for stock assessments
• D. To allocate more funding for research

Answer: (A)

Precautionary buffers are a safety margin built into ACLs to account for the unknowns in stock assessments and the models behind them. In fisheries, we rarely know the exact state of a population—the data have sampling error, there’s natural year-to-year variability in recruitment and growth, and the models we use to translate those data into catch limits rely on assumptions that may not be perfect. If ACLs were set exactly at the best-estimate catch without a buffer, a small overestimate or a bit more variability could push the stock toward overfishing. The precautionary buffer lowers the allowable catch to absorb that risk, helping ensure the stock remains healthy even when data or model predictions are uncertain. That’s why the answer is about accounting for uncertainty in assessment data and the model. The other options don’t capture that protective purpose—buffers aren’t about increasing fishing authority, eliminating the need for stock assessments, or directing funding for research.