NANFA-- Rotenone - response from Ponds List
Wed, 18 Oct 2000 11:47:18 EDT

I asked for information on Rotenone on the Ponds List and received the
following response. It is forwarded with permission.

Chuck Church
Indianapolis, Indiana USA

Rotenone is toxic to all fish if used in high enough concentration (it
paralyzes their gills. Some fish can be revived if they are caught soon after
the application and placed in fresh water or that containing Potassium
permanganate) Five parts per million rotenone will kill all fish! Those that
are the most resistant (hardest to kill) are the non-game specie like common
carp and bullhead. One part per million will kill most gamefish. In most cases
the fish that are wanted to remove are the last to die!

Rotenone can be used selectively to kill part of a population to get a good
sample of the population. An area (finger or small bay) is blocked off with a
plastic or canvas barrier and the rotenone is applied in this area. The dead
fish are then collected, sorted, and counted.

Byron T. Bezdek
Aquatic Management

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