Fisheries dictionary

SPAWNING STOCK BIOMASS PER RECRUIT

(SSB/R)
The expected lifetime contribution to the spawning stock biomass for a recruit of a specific age (e.g., per age 2 individual). For a given exploitation pattern, rate of growth, and natural mortality, an expected equilibrium value of SSB/R can be calculated for each level of F. A useful reference point is the level of SSB/R that would be realized if there were no fishing. This is a maximum value for SSB/R, and can be compared to levels of SSB/R generated under different rates of fishing. For example, the maximum SSB/R for Georges Bank haddock is approximately 9 kg for a recruit at age 1.

  1. spawning stock biomass per recruit—the spawning stock biomass divided by the number of recruits to the stock. It is the expected lifetime contribution to the spawning stock biomass for a recruit of a speci...Dictionary of ichthyology