More info:
Liquid rotenone for fish removal is sold under the brand names Fish Tox®, Nox-Fish®, Prentox®, Prenfish Toxicant, Chem Fish® and Nusyn NoxFish®).
https://srac.tamu.edu/index.cfm/event/getFactSheet/whichfactsheet/219/The amount that you use and the final concentration are based on the species of fish and water conditions which can bind the toxicant and reduce the effectiveness.
Excerpt: "As a piscicide, rotenone interrupts cellular respiration in gill-breathing animals by
blocking the transfer of electrons in the mitochondria. Acute exposure to toxic levels
reduces cellular uptake of blood oxygen, resulting in increased cellular anaerobic
metabolism and associated production of lactic acid causes blood acidosis (Fajt and
Grizzle 1998). Death results from tissue anoxia, which typically produces cardiac and
respiratory failure (Ling 2003). Scientists believe that fish are more sensitive to rotenone
because it is rapidly absorbed into the bloodstream from water flowing across the gill
membrane. Although both fish and aquatic macroinvertebrates are highly susceptible to
rotenone (Skaar 2001), most macroinvertebrate populations quickly recover to pretreatment
levels (Lennon 1971, Schnick 1974b). Gill-breathing amphibians (i.e., frog and
toad tadpoles and larval salamanders) are also adversely affected (Hamilton 1941).
Amphibian adults and reptiles are less sensitive than fish and should not be harmed when
rotenone is applied at concentrations typically used in fisheries management (Farringer
1972). Fall applications of rotenone reduce or eliminate impacts on amphibians because
most species are in the adult stage of development. Rotenone is very unstable in the environment (half-life measured in days) and completely breaks down within one to four weeks depending on pH, alkalinity, temperature, dilution, and exposure to sunlight (Schnick 1974b). It also adsorbs strongly to organic matter in sediment and is rapidly degraded (Dawson et al. 1991)."
http://www.usbr.gov/lc/phoenix/reports/bonitacreek/bcfbappC.pdfSee the link below that lists all the commercial brand names using rotenone. Note how the majority of uses is for insecticides and some are used on pets and in the garden.
http://scorecard.goodguide.com/chemical-profiles/pesticides.tcl?edf_substance_id=83-79-4