First, manual removal has worked many times its just not the most effective.
Second, there is evidence in the west and in the east that a certain density of native trout can be a form of biotic resistance to invasive trout from taking over in some cases. Researchers are currently looking at if just simply “tipping the scales” in some cases could be enough ratio wise. Everyone forgets that when brown trout took over originally in many of theses streams mountains were bare dirt lumps and untreated point source discharges were everywhere. Invasive brown trout won’t have humans coming as the first wave to take out the brook trout en mass this time. While there is no safe amount of brown trout for a brook trout stream there has been a micro population in the savage that brookies have been able to hold off for a long time and still running.
Third, everyone always forgets that super-males are on their way. They could be here in the east in as soon as 10 years which can be paired with manual removal.
I wish more people were educated on this stuff thats why I created this.
Links and sources for his article on watershed-wide management and why we need to stop stocking invasive species.
www.flyfisherman.com