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In page Indian Ocean slave trade:

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Exports of slaves to the Muslim world from the Indian Ocean began after Muslim Arab and Swahili traders won control of the Swahili Coast and sea routes during the 9th century (see Sultanate of Zanzibar). These traders captured Bantu peoples (Zanj) from the interior in the present-day lands of Kenya, Mozambique, and Tanzania and brought them to the coast.[2][3] There, the slaves gradually assimilated in the rural areas, particularly on the Unguja and Pemba islands.[4] Muslim merchants traded an estimated 1000 African slaves annually between 800 and 1700, a number that grew to c. 4000 during the 18th century, and 3700 during the period 1800–1870.[citation needed]