Table 2. Mean representation (number of fish in the sample divided by the initial number of eggs planted out/retained in hatchery) and mean LF for each group for the 1993, 1994 and 1998 cohorts.
| Cohort | Sample |
Representation |
Fork length (LF) |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| WW | WF | FW | FF | WW | WF | FW | FF | ||||
| 1993 | Electrofishing August 1993 0+parr | 0.005 (1.00) | 0.01 (1.97)a | 0.003 (0.61) | 0.002 (0.49) | 54.50±0.96 (1.00) | 57.43±0.58 (1.05)a | 54.78±1.00 (1.01) | 59.24±0.92 (1.09)b | ||
| 1994 | Electrofishing August 1994 0+parr | 0.016 (1.00) | 0.012 (0.76)c | 0.010 (0.65)d | 0.008 (0.48)d | 54.13±0.33 (1.00) | 55.67±0.43 (1.03)a | 56.89±0.43 (1.05)a | 57.41±0.52 (1.06)b | ||
| 1994 | Electrofishing June 1995 1+parr | 0.019 (1.00) | 0.014 (0.74) | 0.016 (0.84) | 0.011 (0.58)b | 94.02±0.71 (1.00) | 96.46±0.69 (1.03) | 98.09±0.66 (1.04)a | 98.69±0.78 (1.05)b | ||
| 1993 | Trapped parr May 1993–May 1994 | 0.017 (1.00) | 0.014 (0.82) | 0.008 (0.47)b | 0.005 (0.29)d | ||||||
| 1993 | Trapped pre-smolts+smolts September 1994–April 1995 | 0.007 (1.00) | 0.006 (0.86) | 0.003 (0.43)c | 0.003 (0.43)c | ||||||
| 1994 | Trapped parr May 1994–May 1995 | 0.023 (1.00) | 0.011 (0.48)b | 0.012 (0.52)b | 0.005 (0.22)d | ||||||
| 1994 | Trapped pre-smolts+smolts September 1995–April 1996 | 0.003 (1.00) | 0.002 (0.67) | 0.003 (1.00) | 0.002 (0.67) | ||||||
| 1993 | Hatchery controls 0+parr August 1993 | 0.013 (1.00) | 0.012 (0.92) | 0.009 (0.69) | 0.01 (0.77) | 106.14±2.72 (1.00) | 114.09±2.23 (1.07)a | 109.64±2.28 (1.03) | 111.41±1.54 (1.05)a | ||
| 1993 | Hatchery controls mature 0+parr November 1993 | 0.018 (1.00) | 0.006 (0.33)a | 0.011 (0.61) | 0.005 (0.28)a | 133.78±1.77 (1.00) | 135.89±5.07 (1.02) | 137.81±3.18 (1.03) | 133.47±2.48 (0.99) | ||
| 1993 | Hatchery controls smolts March 1994 | 0.023 (1.00) | 0.013 (0.57) | 0.019 (0.83) | 0.019 (0.83) | 170.35±1.72 (1.00) | 168.16±2.03 (0.99) | 173.21±1.73 (1.02) | 178.56±1.68 (1.05)a | ||
| 1994 | Hatchery controls smolts March 1995 | 0.015 (1.00) | 0.014 (0.93) | 0.013 (0.87) | 0.014 (0.93) | 136.34±5.29 (1.00) | 162.80±2.44 (1.19)d | 156.14±±3.11 (1.15)b | 170.20±3.61 (1.25)d | ||
| WW | BC1W | F2Hy | BC1F | FF | WW | BC1W | F2Hy | BC1F | FF | ||
| 1998 | Electrofishing August 1998 0+parr | 0.008 (1.00) | 0.005 (0.65)a | 0.006 (0.81)c | 0.005 (0.66)c | 0.003 (0.44)d | 64.60±0.61 (1.00) | 66.91±0.63 (1.04) | 69.99±0.91 (1.08)a | 70.49±0.73 (1.09)b | 73.77±0.74 (1.14) |
| 1998 | Trapped parr May 1998–May 1999 | 0.011 (1.00) | 0.007 (0.64)a | 0.002 (0.18)d | 0.001 (0.09)d | 0.001 (0.09)d | |||||
| 1998 | Trapped pre-smolts+smolts 1998 cohort | 0.003 (1.00) | 0.003 (1.00) | 0.005 (1.67) | 0.004 (1.33) | 0.003 (1.00) | |||||
Abbreviations: FF, pure farm group; GLMM, generalised linear mixed effects model; LF, fork length; LMM, linear mixed effects model; WW, pure wild group.
Also shown in parentheses are the means expressed relative to (divided by) the means for the WW reference group, and whether groups differ significantly (based on the GLMM for representation and the LMM for LF, both of which control for egg size variation) from the WW group: P-value bands.
a
P-value band: 0.05–0.01.
b
P-value band: 0.01–0.001.
c
P-value band: 0.1–0.05.
d
P-value band: <0.001.