[en] Searches for pair-production of supersymmetric particles under the assumption that R-parity is violated via a single dominant LL anti E,LQ anti D or anti U anti D anti D coupling are performed using the data collected by the ALEPH collaboration at centre-of-mass energies of 181-184 GeV. The observed candidate events in the data are in agreement with the standard model expectations. Upper limits on the production cross-sections and lower limits on the masses of charginos, sleptons, squarks and sneutrinos are derived. (orig.)