Table 1.

RRS (relative number of adult offspring per parent) of two types of captive-reared fish, C[C×W] versus C[W×W]. RRS is given as an unbiased estimate (19, 20). P values were calculated by a one-tailed permutation test. Statistical power represents the minimum effect size (displayed as RRS) detectable with 80% and 95% power. [See (19) and footnote of table S1 for details.] When all parents were compared, overall RRS was estimated using weighted geometric means. The P values were calculated on the basis of Fisher's combined probability (19). For single cohorts, only 3-year-old C[C×W] and C[W×W] were compared. *P < 0.05, **P < 0.01

Run-yearN [offspring assigned]RRSP valueStatistical power (80%/95%)
From all parents
[Male]
    1998 79 0.341 0.035* 0.626/0.341
    1999 26 0.577 0.239 0.462/0.296
    2000 79 0.856 0.381 0.701/0.540
    Overall male 0.545 0.074
[Female]
    1998 74 0.504 0.238 0.384/0.156
    1999 25 0.212 0.007** 0.468/0.321
    2000 72 0.828 0.319 0.706/0.567
    Overall female 0.547 0.020*
Overall both sexes 0.546 0.009**
From single cohorts
[Male]
    1998 48 0.361 0.044* 0.582/0.361
    1999 25 0.502 0.171 0.502/0.324
    2000 77 0.862 0.390 0.705/0.543
    Overall male 0.596 0.070
[Female]
    1998 22 0.985 0.591 0.257/0.075
    1999 15 0.137 0.036* 0.351/0.137
    2000 56 0.798 0.319 0.641/0.480
    Overall female 0.631 0.125
Overall both sexes 0.609 0.042*