Fecundity variation in Icelandic summer-spawning herring and implications for reproductive potential

function of L or W (r 2 ¼ 0.84 in either case). Fulton’s condition factor K (¼100WL 3 ) explains a trivial (1.5%) but significant ( p < 0.0001) amount of the residual variation in FP, and appears to have the greatest effect among smaller length classes. RFP is also a function of L (r 2 ¼ 0.56), and oocyte diameter explains 36% of the residual variation ( p < 0.001). Therefore, stock-specific total egg production in herring can diverge from the assumed proportionality between total egg production and spawning-stock biomass through variations in the length structure of the stock, and to a lesser extent through the condition of prespawning herring.