Time of divergence of growth groups between potential 1+ and 2+ smolts among sibling Atlantic salmon

Abstract

Development of bimodality in the length frequency distributions of sibling juvenile Atlantic salmon, Salmo salar L., was observed in three experiments, using eight families in 25 tank populations. Divergence between the groups became evident in late summer or early autumn. The time of divergence, and the size offish at which this change took place differed between families.