With trout densities approaching 4,000 per square mile, experts reduced the total number of brown trout in Spearfish Canyon last year, reports the Black Hills Pioneer. Trout over three years of age in Spearfish Creek, Spearfish Canyon and in portions of the creek throughout Spearfish have experienced stunted growth.
After reducing the population of brown trout, which tend to behave more aggressively than rainbow trout, researchers are now looking into whether or not the overall population has experienced greater individual growth with reduced population numbers.
This year’s examination marks the second year of a three year study. While it is too soon to determine if the removal efforts have had a positive impact, the current results indicate that the remaining fish have experienced some growth.