[1][2][3] A member of the Congregation of the Sacred Hearts of Jesus and Mary, he was appointed by the Holy See Vicar Apostolic and Titular Bishop of Nilopolis[4] from 1833 to 1843 of the Vicariate Apostolic of Oriental Oceania, from which were derived the Archdiocese of Papeete, the Diocese of Honolulu and the Diocese of Taiohae or Tefenuaenata in the Marquesas Islands.

Rouchouze resided in Valparaíso, Chile and in Honolulu; he was responsible for the evangelization efforts of the Picpus Fathers in the Hawaiian Islands and eastern Pacific.

Prior to his episcopal ministry, Pope Gregory XVI, on 27 November 1825, created the Prefecture Apostolic of the Sandwich Islands.

He was subsequently consecrated to the episcopate in Rome, on 22 December 1833 by the Prefect of the Propaganda Fide, Cardinal Carlo Maria Pedicini.

John Bede Polding, O.S.B., Titular Bishop of Hierocaesarea and Vicar Apostolic elect of New Holland.

Rouchouze, accompanied by six priests, one sub-deacon, seven lays brothers and ten sisters, left Saint Malo for Oceania on the Marie-Joseph.