ca = .303
        cb = -0.275
        cq = 5
        cto = 15
        ctm = 18
        ctl = 24
        ck1 = 0.36
        ck4 = 0.01
        
        ka = (.36 * l1) / (1+.36(l1-1))
        kb = (.01*l2)/(1+.01(l2-1))
        ra = .00264
        rb = -0.217
        rq = 0.06818
        rto = 0.0234
        rtm = 0
        rtl = 25
        rk1 = 27.5
        rk4 = 0.13
        act = 9.7
        bact = 0.405
        sda = 0.172
        fa = 0.212
        fb = -0.222
        fg = 0.631
        ua = 0.0314
        ub = 0.58
        ug = -0.299
        alpha = 5764
        beta = 0.9862
        dy = 5250

        The user selects dr (prey energy density) and
        p (proportion of maximum consumption)

We assume no differences in bioenergetics of juvenile and adult chinook once the fish become fry and have absorbed their yolk sac completely. Although is is possible that the fish can begin eating prior to this point, the overall contribution to growth is small.

Growth in the river is terminated by one of three methods:

• The fish reaches a certain size (and migrates)
• A certain day of the year marks the end of growth (could be day 365, of course)
• The river temperatures reach a certain value (and fish stop feeding). This assumes rising temperatures through the spring and summer and attainment of the temperature in the system, otherwise it will grow to the end of the year.