I went to Brooks Falls in the Katmai National Park and Preserve in Alaska for an exam review with my favorite student. We decided to stay the entire month of July to study the prey- predator dynamics of Grizzly bears and salmon. From June to September each year, the salmon swim upriver to get to their spawning sites. This is when grizzly bears gather to feed on them. Grizzlies feed only on salmon during this time and follow Lotka-Volterra dynamics. The mortality rate of grizzlies in the absence of salmon is 0.3 per week, and the intrinsic growth rate of salmon in the absence of predation is 0.2 per week. The capture efficiency is 0.004, and the efficiency at which salmon biomass is converted into grizzly biomass is 0.3. If there are initially 15 grizzlies and 400 salmon, the overall rate of change in the salmon population will be a per week. Round your answer to the nearest whole number