Patterns of Linear Growth and Annulus Formation on Scales of Pacific Herring in the Peter the Great Bay

Abstract

Based on long-term data on Pacific herring in the Peter the Great Bay, it has been established that the growth zone on scales begins in April and May, whereas the annuli form between October and January. The phenological season of active somatic growth starts in April and May for herring in this area, the largest body length gains are detected in late summer and early autumn, and active growth ends by November and December. Size diversity for young fish depends on starting conditions for growth in the first year of life and the timing of puberty. Size diversity increases in adult fish because of the accelerated growth for the fish dwelling in local favorable habitats with longer growth seasons or internal reserves of the body.