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Microplastics (MPs) and fouling organisms are prevalent in oceans worldwide. The study aims to investigate the pollution characteristics of MPs in fouling organisms. The study found significant inter-specific differences in the MPs abundance, while the length of MPs is consistent. The average number of MPs in N. exigua is 0.00 ± 0.00. There is a correlation between MPs abundance and weight in sessile group, while gastropods don't. Direct observation has demonstrated that the radulae of N. radula can envelop MPs. Fiber and blue are the predominant forms and colors of MPs found in fouling organisms. It is noteworthy that all film and fragment MPs observed were of a blue hue and had a size limitation of 500 μm. The characteristics of MPs between sessile organisms are more similar than those between gastropods. This study has improved our understanding of the pollution characteristics of MPs in fouling organisms, specifically gastropods. [Display omitted] • There are interspecific differences in the abundance of microplastics (MPs). • There is a correlation between MPs abundance and weight in sessile group. • The average number of MPs in N. exigua is 0.00 ± 0.00. • The radulae of N. radula can envelop MPs. • The MPs characteristics between sessile groups are more similar than those between gastropods. [ABSTRACT FROM AUTHOR]