What does SSB stand for and what does it indicate in stock assessments?

• A. Spawning Stock Biomass; indicates reproductive capacity and guides rebuilding plans.
• B. Stock Health Indicator; used to set annual quotas.
• C. Recruitment Potential; forecasts future population growth.
• D. Total Allowable Catch Benchmark; determines limit setting.

Answer: (A)

SSB stands for Spawning Stock Biomass. It represents the total biomass of sexually mature fish in the stock, the part capable of reproducing. Because reproduction drives future recruitment and population sustainability, SSB is a direct signal of the stock’s reproductive capacity and is used to set rebuilding targets and reference points when management actions are needed. The other terms describe different ideas—recruitment potential focuses on future offspring, a general health indicator isn’t specific to spawning biomass, and a total allowable catch benchmark relates to catch limits, not reproductive capacity.