The slave ship Mersey departed on a transatlantic slave-trading voyage that would carry enslaved Africans to Trinidad and Tobago.

Vessel: Mersey; flag: Great Britain; rig: Ship; estimated standardized tonnage: 212. People recorded in connection with the voyage: Captain: Johnson, Robert; Investor: Johnson, Robert; Captain: Olderman, John. The voyage began at Liverpool on 28 July 1799. Principal recorded place where captives were acquired: Bonny (Bight of Biafra and Gulf of Guinea islands). Principal recorded disembarkation place: Trinidad, port unspecified. Recorded outcome: Voyage completed as intended.