How many Salmon are Enough Salmon? Objective Students will be able to calculate rates of escapement of salmon and draw conclusions based on population trends. Students will be able to compare different sets of data based on graphs. Students will be able to explain the importance of maintaining a balance in the environment and show the importance of individuals within an ecosystem. Background Lake Clark National Park and Preserve is a major spawning ground for the sockeye salmon. Park biologists study salmon populations in the Newhalen River. Over thirty years of data from that study helps us u Duration: 90 Minutes Additional Standards: NGSS HS-LS2: Use mathematical representations to support and revise explanations based on evidence about factors affecting biodiversity and populations in ecosystems of different scales CCSS.MATH.CONTENT.HSS.IC.A.1, .HSS.IC.B.3, .HSS.IC.B.4, .HSS.IC.B.6 Essential Que.