In theory they kill of all the lake fish and restock but in reality they kill of water fowl that feeds on the fish and countless amphibians and reptiles which they do not restock.
When I lived in Long Island they (gvmt wildlife mngmt) sprayed "safe" mosquito spray in local waters .
Within 2 yrs after they did that I went from seeing countless toads,frogs,salamanders and lots small garter snakes every spring/summer to not seeing ONE not one ever again.
The mosquitos came back any way the other animals did not.
When I lived in Long Island they (gvmt wildlife mngmt) sprayed "safe" mosquito spray in local waters .
Within 2 yrs after they did that I went from seeing countless toads,frogs,salamanders and lots small garter snakes every spring/summer to not seeing ONE not one ever again.
The mosquitos came back any way the other animals did not.