Laserfiche WebLink
"4000 <br />Q. Are fish eggs affected by rotenone? <br />A. Research indicates that fish eggs are much more <br />resistant to rotenone treatments than larval or adult <br />stages. For example, newly-fertilized rainbow trout <br />eggs were 47-106 times more resistant; salmon eggs <br />are 10 times more resistant than the fish, and carp <br />eggs are 50 times more resistant. <br />Q. How does rotenone effect the environment? <br />A. Rotenone is non-persistent so there is no accumula- <br />tion in the water, soil, plants, or surviving animals. <br />Because it breaks. down so rapidly, its environmental <br />significance does not extend beyond one year. For <br />example, populations of aquatic invertebrates that <br />have been reduced may take from several months to a <br />year to recover to their former numbers. Surviving <br />organisms will grow and reproduce at an accelerated <br />rate due to the reduced competition. While adult <br />frogs and other amphibians would not be seriously <br />affected, tadpoles and juvenile salamanders probably <br />would be killed. For these species, it would be the <br />next breeding season before more animals would be <br />produced and the populations would be slower to <br />recover. <br /> <br />0 <br />x <br />c, <br />C <br />0 <br />U