Research Article

Life History Tactics in Cohorts of a Partial Migratory Brown Trout (Salmo trutta L.) Population

Figure 1

The percentage (%) of brown trout with low (<1.6, white bars) and high (>1.6, black bars) levels of plasma 11-ketotestosterone (11-kt) in the downstream section (D) and the upstream section (U) in Greåna River. Low levels of 11-kt corresponded to females and immature males, whereas high levels corresponded to mature males.
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