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1 <br />' The mathematical formulas and logical flow were programmed exactly as in the original <br />model. Input parameters were entered from the `A' folder of the model by changing the <br />properties associated with the `run' button. For a further description of the model <br />' mechanics, see Appendix 2. <br />Again, based on reviewer comments, three important changes have been made to the <br />current models. First, adult movement is no longer unidirectional. After spawning, <br />' adults return to their original habitat. If that habitat is fully occupied, the fish move up <br />or downstream with equal likelihood until a suitable adult habitat is found. The second <br />' ma'or than a is that mortalit values are now made stochastic b drawin from a <br />J 9 Y Y 9 <br />' lognormal, rather than normal, distribution. As discussed above, this ensures a <br />correlation (0.4-0.6) among age classes within a year and results in 75% of the years <br />being average or below for recruitment (and survivorship). Finally, mortality for >1- <br />year-old fish due to movement is now set at zero. The option still exists to change <br />' mortality associated with movement for all age classes with ease, since each age class <br />has a parameter input function for movement mortality. <br />1 <br /> <br /> <br /> <br /> <br /> ., <br />~ <br />1 <br />