Schematic of paired release-recapture study. Schematic of the paired release-recapture design simulated under the null hypothesis of homogeneity with associated release sizes (R), survival (S), detection (P), and the joint probability of survival and detection in the last reach (λ). Detection probabilities P
11 = P
12 = . . . = P
14 = P
24 were varied at values of 0.10, 0.20, . . ., 0.90, 0.95, and 0.98.