OCCURRENCE AND SHAPES OF MICROPLASTICS IN SELECTED SEAFOOD SPECIES, WATER AND SEDIMENTS COLLECTED FROM EPE LAGOON, LAGOS STATE, NIGERIA
Keywords:
Microplastics, Occurrence, Shapes, Epe lagoon, Seafood.Abstract
Microplastics have become widely distributed in the environment to an extent that their occurrence in human consumables is currently a growing concern globally. In this study, tissues (gill, gut and muscle) of four selected seafood species in Nigeria (Tilapia zilli, Clarias gariepinus, Penaeus notialis and Pomacea canaliculata) were assessed for the occurrence and shapes of microplastics. Samples were collected from three points (Jubilee Chalete, Ojuolokun and Oko orisan) located on Epe lagoon, Lagos State. Collected seafood samples were dissected for tissues collection. The tissues were digested and microplastics were extracted from digested samples using membrane filtration procedure. With the aid of a stereomicroscope, membrane filters (pore size 0.45 um) were examined for visual counting and identification of the shapes of the microplastics. Results showed varying levels of microplastic particles of different shapes in all the accessed tissues of all seafood species examined. While there were no significant differences (p>0.05) in the concentrations of microplastics found in the tissues of Clarias and Pomacea, tissues of Tilapia and Penaeus showed significant differences (p<0.05) in the levels of accumulated microplastic particles. Highest mean concentrations of microplastics in the gill and muscle were recorded from the tissues of Tilapia (16.00 and 9.25particles/individual respectively) while the lowest values (7.33 and 6.50 particles/individual respectively) were recorded from the tissues of Penaeus. The shapes of microplastics identified, in the order of abundance, include fragment, fibre, filament, pellet/bead, film, and foam. These findings suggest that humans are at risk of ingesting microplastics when they consume seafoods.
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