Found a couple more references on the rotenone/fish egg topic.
On the Prentiss web site (they sell rotenone), I found the following.
http://www.prentiss.com/Products/fishman.htm "Are fish eggs affected by Rotenone treatments?
Most fish eggs are 10-100 times more resistant the fish."
Then, I found the following on the Oregon Department of Fish and Wildlife web site.
http://www.dfw.state.or.us/ODFWhtml/InfoCntrFish/DiamondLake/Rotenone.html Q. Are fish eggs affected by rotenone?
A. Research indicates that fish eggs are much more resistant to rotenone treatments than larval or adult stages. For example, newly fertilized rainbow trout eggs were 41 to 106 times more resistant; salmon eggs are 10 times more resistant than the fish and carp eggs are 50 times more resistant.
So, rotenone does kill fish eggs, but typically at much higher levels than we use for killing fish. At the current costs of rotenone, which are very high, I doubt that many people would want to go to sufficient treatment levels to kill fish.
Whew, Bill: once these questions start, they always get interesting, don't they??
Dave
