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I found this in Copernic 2000 It is used a lot in Oregon . http://www.dfw.state.or.us/ODFWhtml/InfoCntrFish/DiamondLake/Rotenone.html Rotenone is the most commonly used compound for treating lakes. It has been used in numerous lakes and reservoirs in Oregon with great success to remove unwanted fish species and restore traditional fisheries. Diamond Lake was treated in 1954 with rotenone and treatment was 100 percent successful. Biologists believe the treatment can be repeated to restore this highly productive fishery. Rotenone treatments are not without risks, however, and members of the public have expressed concerns about how safe rotenone treatment is, how long residues remain and what the effects are on other wildlife in the area. In planning for the Diamond Lake treatment, many steps will be taken to isolate the treated water and minimize the risk of potential impacts to other waters and wildlife. Here is one of there Q/A items. Q. Is it safe to eat fish killed by rotenone? Calculations that address a worst case situation indicate that a 132 pound person would have to consume 535 pounds of raw fish containing 100 ppb rotenone to acquire a toxic dose. Cooking destroys rotenone so there would be a further loss of any residues during cooking. However, because no tolerance (acceptable residue level permitted in fish flesh) has been set by EPA, the consumption of rotenone killed fish cannot be recommended. just me, Marjorie