The Fish Stock Sustainability Index is a quarterly index that measures the performance of certain fish stocks. To make sure the index continues to focus on the most important commercial and recreational stocks, we’ve revised the list of included stocks.
The index allows for a quick, clear snapshot of the performance of U.S. fishery management. When the status of a commercially or recreationally important stock improves (e.g., no longer subject to overfishing, not overfished, or rebuilt), the total index score increases.
NOAA Fisheries tracks the status of all international and domestic stocks contained in federal fishery management plans whether or not they meet criteria for inclusion in the index.
When we developed the index in 2005, it included 230 fish stocks and the maximum index score was 920 points. In 2015, we trimmed it to 199 stocks and a maximum score of 1,000.
Determining the Score
Step 1: Assign weighted criteria points for each stock based on the following:
|1. "Overfished" status is known.||0.5|
|2. "Overfishing" status is known.||0.5|
|3. Overfishing is not occurring (for stocks with known "overfishing" status).||1.0|
|4. Stock biomass is above the "overfished" level defined for the stock.||1.0|
|5. Stock biomass is at or above 80% of the biomass that produces maximum sustainable yield (BMSY)*||1.0|
Step 2: Calculate the sum of criteria points for all FSSI stocks.
Step 3: Calculate maximum criteria points possible: multiply number of FSSI stocks (175) x maximum criteria points per stock (4 points).
Step 4: Calculate a raw total point score: divide sum of criteria points / maximum criteria points possible.
Step 5: Convert raw total point score to a 1,000 point scale: total raw point score* 1,000.
Read the history of the index and the stocks included in the index since 2005.