Microfouling means microscopic organisms including bacteria and diatoms and the slimy substances that they produce. Biofouling comprised of only microfouling is commonly referred to as a slime layer.

Source: Resolution MEPC.207(62), 2011 Guidelines for the control and management of ships’ biofouling to minimize the transfer of invasive aquatic species, 15 July 2011, International Maritime Organization. Regulatory Guidance

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