From July–October 1826, she underwent alteration from a brig-sloop to a ship-sloop via the addition of a third mast. Then in October, Commander Peter Richards recommissioned her. In January 1827, "Pelorus" was employed in the Mediterranean protecting British trade in the Archipelago, at Alexandria, and around the coasts of Syria and Caramania. Commander Michael Quinn took command from September 1828. On 21 December 1829, she struck a rock at the entrance of Port Mahon, Menorca, Spain; she was refloated on 23 December 1829, but subsequently sank. came from Gibraltar to retrieve her officers and crew. "Pelorus" was refloated, and by 9 May 1830 she was back in Portsmouth. From December 1830 to December 1831, she underwent repairs and an alteration back to a brig. In 1831, William Wilberforce's anti-slavery law was passed. In September, Captain Richard Meredith recommissioned "Pelorus" and she joined the West Africa Squadron. Here she patrolled the west coast of Africa to suppress the slave trade. On 9May 1832, she was at Sierra Leone having brought in the Spanish slaving vessel "Segunda Theresa", which was carrying 459 slaves. On 18 October 1832 "Pelorus" sailed from the Cape of Good Hope for Simon's Bay. In May 1833 she was back at the Cape, and on the 16th she sailed for Mauritius. She arrived there on 3 June. A month later, on 6 June, she left Mauritius for Colombo with specie to pay the troops in Ceylon. From there she returned to the Cape, from whence she sailed for St Helena, where she arrived on 7 December. She then sailed to Ascension and the west coast of Africa. On 16June 1834, Lieutenant Philip de Sausmarez of "Pelorus" came before a court martial. The charge was that on 18 April 1832, while in command of the prize crew on the "Segunda Theresa", Sausmarez had the boatswain's mate of administer 24 lashes to Francis Brown for neglect of duty. Meredith preferred the charges because he had forbidden the lash in written orders. The court supported Suasmarez, who had been under arrest for 18 months before his exoneration. On 30June, boats from "Pelorus" captured the Spanish slaver "Pepita". At the time of her capture, "Pepita" had no slaves aboard.