High ingestion of microplastics by Whitemouth croaker: an indication of the need to reduce coastal anthropogenic impact
Abstract
The aquatic ecosystem receives solid waste through domestic, agricultural and industrial effluents, released there without treatment. They undergo fragmentation into microplastics (MPs) and they are ingested by the fish community. The occurrence of MPs in the gastrointestinal tract (TGI) of Whitemouth croaker (Micropogonias furnieri) commercialized in João Pessoa, Paraíba, Brazil was investigated. In the laboratory, the TGIs were immersed in 30% H2O2 (24h), one of the three methods tested and considered the best option for organic matter degradation and more accurate quantification of MPs. One hundred TGIs of Whitemouth croakers with 84% prevalence of MPs were analyzed. Altogether, 562 MPs were found, revealing an average abundance of 5.62 ± 6.08 MP/TGI with variation between 0 and 31 per TGI. The size range of Whitemouth croaker TGIs was 4.0 to 45.0 cm (17.5 ± 8.5 cm) and there was no correlation between MP abundance and TGI size (r=0.16; p>0.05). As microplastics are potential vectors of different toxic substances, their high prevalence and abundance reinforce the need to reduce the anthropogenic impact on the aquatic environment, in order to improve the nutritional quality of Whitemouth croaker, which represents a source of incomes and ample consumption for many families.