He was promoted commander in 1808, and captain in 1814, and 1816-1819 made a successful campaign in the West Indian waters, for which he was created Baron, 25 May 1819.
Afterward, he was despatched with a corvette to protect the French fisheries on the coast of Newfoundland, when a difficulty with England threatened to end in war, and was promoted to rear admiral in 1821.
Rotours also provided means to check the return of yellow fever epidemics, established a hospital and a camp for the soldiers on Matouba volcano, at the coolest station in the mountains, drained the marshes that surrounded Pointe-à-Pitre, executed great works in that harbor, completed the canal named Vatable, and also constructed in Grande-Terre several other canals, which proved of great benefit to the colony.
Under his administration, Guadeloupe attained a high state of prosperity, and when Rotours obtained his recall in May 1830, regret was felt at his departure.
His works include Mémoire sur le mode de procédure criminelle en vigueur à la Guadeloupe (Paris, 1826).