I just got back from Prospect Lake. A man was in a small row boat fitted with a 100 gallon drum of weed killer. He said he was doing weed eradication. Are most urban warm water fisheries treated in a like manner? What Chemical is used?
If the lake is part of a drinking water supply, then yes the city will use algicides. Its mainly for taste and odor control, the algae dies and causes T
and O which increases the amount of customer complaints, which makes everyone down at city hall on edge. copper sulfate is the chemical that is used most often. harmless to fish as long as it isn't overdosed. And it is a blue color.
I have to agree. Bio-control does have some drawbacks, and unsterilized introduced carp are a problem is a lot of places, but blue trout and chemicals on my fly line doesn’t sound all that fun anymore.