Spawning stock biomass (SSB) or total biomass (B) that existed, or that would exist, for a stock that has not yet been fished, or if it had not been fished (also called the “unexploited” biomass or unfished level). This may refer to an estimated historical biomass level before fishing commenced, or the current biomass that would have existed had no fishing occurred.
Synonyms:
Unexploited biomass, Unfished level