5. Risk Assessment of a Proposed Introduction of Pacific Salmon
71
Figure 5.5. Year-specific distribution functions for the maximum number of Coho Salmon
strays per stream (males and females combined).
returns, and thus all the strays, are males. The expected return in the peak year is
480 fish, of which 28 would be strays. The model indicates a 99% probability of
60 or fewer strays (35 or fewer females; Fig. 5.6) in a single stream.
The Steelhead Trout simulations produced intermediate stray densities (Fig.
5.7). The stray density CDFs display a large amount of annual variation as a
Figure 5.6. Year-specific distribution functions for the maximum number of Coho Salmon
strays per stream (females only).