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Fig. 5. Plasma levels of follicle-stimulating hormone (FSH), testosterone (T),
11-ketotestosterone (11KT) and estradiol (E2) in chum salmon in the central
Bering Sea and the NW Pacific Ocean, 2001–2003. Fish were divided into
immature fish and maturing adult I and II, as shown in the inset in
Fig. 3. Values are means
± s.e.m. n.d., not determined. Significant differences among groups are
identified with different letters (P<0.05 one-way ANOVA and
Tukey's test). See Table 1 for
the number of fish.