Suppose our fishery has another lake full of bass, that the intrinsic growth rate is dB dt .25 B 1 (1- B 500 tons/year (8.7) and that we are harvesting the bass at a uniform rate of 20 tons/year. 1. Modify equation( 8.7) to account for the harvesting. 2. Suppose B(0) = 150 tons. Draw a graph of this trajectory (curve). What does the model predict about the amount of fish in the lake over a long period of time? 3. Suppose that the amount of harvesting is increased from 20 tons/year to 30 tons/year. What does the model predict now about the amount of fish over a long period of time? Problem #408: 250 (1- Suppose our fishery has another lake full of bass, that the intrinsic growth rate is dB B dt 500 tons/year (8.7) and that we are harvesting the bass at a uniform rate of 20 tons/year. 1. Modify equation( 8.7) to account for the harvesting. 2. Suppose B(0) = 150 tons. Draw a graph of this trajectory (curve). What does the model predict about the amount of fish in the lake over a long period of time? 3. Suppose that the amount of harvesting is increased from 20 tons/year to 30 tons/year. What does the model predict now about the amount of fish over a long period of time?