Evaluation of Ballast Water Management Practices Among Foreign-Flagged Vessels Calling at Apapa Port

Ballast water discharged from international vessels introduces non-native aquatic species into receiving water bodies, posing significant ecological risks to port environments. This study evaluates the ballast water management practices of foreign-flagged vessels calling at Apapa Port, Lagos, against the requirements of the International Convention for the Control and Management of Ships' Ballast Water and Sediments. A descriptive survey design was employed, using review of ballast water management plans, ballast record books, and structured interviews with chief officers and environmental compliance superintendents of twenty commercial vessels during port calls. Sampling of discharged ballast water was conducted at two terminal berths to test for invasive organism indicators. Findings reveal variable compliance levels, with larger vessels from established maritime nations demonstrating better adherence to mid-ocean exchange or treatment system requirements than smaller vessels operating under flags of convenience. Several vessels were found to lack approved ballast water management plans, and ballast record book entries were incomplete on a significant proportion of the sample. Invasive species indicators were detected in water samples from three discharge events, suggesting non-compliant exchanges. Recommendations include mandatory ballast water sampling by NIMASA port state control officers, capacity building for inspectors in ballast water assessment techniques, and enhanced information sharing between Nigerian and foreign port state control authorities. Keywords: ballast water management, Apapa Port, invasive species, BWM Convention, port state control