U.S. Dept Commerce/NOAA/NMFS/NWFSC/Publications
Figure 42
Figure 42. Changes over a 25-year period in the duration of return and spawning timing for coho salmon from five Washington hatcheries. (Reproduced from Flagg et al. 1995).
Figure 43

Figure 43. Schematic diagram of mixing of naturally and hatchery produced fish in natural habitat. Ovals represent the total spawning in natural habitat in successive generations (Gen. 1-3). This total is composed of naturally produced (N) and hatchery produced (H) offspring of individuals in the previous generation.