Biology 1st Edition by Jerome Krueger, Kendra Hill, Robert Noyd

تمرين 19

In the early 1970s, the U.S. government made a major effort to increase salmon populations through fish hatchery production and release. This artificial means of increasing the fish population was considered critical to preventing the extinction of salmon throughout much of their range. Does the graph indicate evidence that this program has had any impact on salmon counts in the Lemhi River?