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Fenitrothion .svg
IUPAC name
Other names O,O-Dimethyl O-4-nitro-m-tolyl phosphorothioate
O,O-Dimethyl O-(3-methyl-4-nitrophenyl) phosphorothioate
CAS number 122-14-5 Yes check.svgY
PubChem 31200
Molecular formula C9H12NO5PS
Molar mass 277.23 g/mol
 Yes check.svgY (what is this?)  (verify)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Fenitrothion is an organophosphate insecticide.

In experiments fenitrothion at sublethal doses affected the motor movement of marsupials[1]; and at acute dose levels it reduced the energy of birds.[2]

In chonic (low) dose tests, unexpectedly only the lowest concentration (0.011 microgram/liter) of fenitrothion depressed the growth of an algae, though all of the chronic dose levels used were toxic in other ways to the algae.[3]

Just half of Fenitrothion's minimally effective dose altered the thyroid structure of a freshwater murrel (the snakehead fish).[4]


  1. ^ Buttemer WA, Story PG, Fildes KJ et al. ‘Fenitrothion, an organophosphate, affects running endurance but not aerobic capacity in fat-tailed dunnarts (Sminthopsis crassicaudata)’ Chemosphere. 2008 Jul;72(9):1315-20.
  2. ^ Fildes K, Astheimer LB, Buttemer WA. ‘The effect of acute fenitrothion exposure on a variety of physiological indices, including avian aerobic metabolism during exercise and cold exposure’ Environ Toxicol Chem. 2009 Feb;28(2):388-94.
  3. ^ Ferrando MD, Sancho E, Andreu-Moliner E. ‘Chronic toxicity of fenitrothion to an algae (Nannochloris oculata), a rotifer (Brachionus calyciflorus), and the cladoceran (Daphnia magna)’ Ecotoxicol Environ Saf. 1996 Nov;35(2):112-20.
  4. ^ Saxena PK, Mani K. ‘Effect of safe concentrations of some pesticides on thyroid in the freshwater murrel, Channa punctatus: a histopathological study’ Environ Pollut. 1988;55(2):97-105.

The name "MEP" is approved by the Japanese Ministry of Agriculture, Forestry and Fisheries.

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