Pollock Length-Frequency by Season

A season before June 20; B season June 20 and later

This is an exploratory analysis of seasonal and spatial patterns in the observed pollock length-frequency samples. It is intended to identify patterns that may warrant further investigation, not to serve as a formal test of an assessment-model configuration.

Explore sex-ratio and growth patterns

The figures show pollock (SPECIES = 201) observations as proportions within each year. A season includes samples before June 20; B season begins June 20. Only 1991 and later are included, and observations below 20 cm are excluded. Fish 65 cm and longer are accumulated in the 65 cm plus group. Each ridge is normalized over the displayed bins. Earlier years are shown at the top.

A and B seasons

Figure 1: Pollock length-frequency proportions by season. The left panel shows samples before June 20; the right panel shows samples from June 20 onward.

Combined seasons

Figure 2: Pollock length-frequency proportions across both seasons.

B season by NMFS area

Figure 3: B-season pollock length-frequency proportions by NMFS area group. B-season samples are from June 20 onward. The left panel represents samples west of 170°W, and the right panel represents samples east of 170°W—approximately the areas west and east of the Pribilof Islands.