a) The von Bertalanffy model -calculated average length at maturity (age 2, L2) and fecundity (female eggs) estimates for different vendace populations put in the order of their location from north to south. The bars show the minimum and maximum annual values. b) The constant survival estimates for mature (2 yr and older, mS) vendace. The symbols + and – show the averages for abundant and sparse population regimes, respectively, in Lake S. Konnevesi and Puruvesi.