The presence of microplastics on the planet has become a great threat to marine ecosystems and to the organisms that inhabit them. This problem covers a wide group of animals, such is the case of marine fish. The objective of this work was to evaluate the presence and types of microplastics ingested by fish of commercial importance in the Navachiste-Macapule and Topolobampo-Ohuira lagoon systems, Sinaloa, México . A total of 556 stomachs of fish sampled with a hook line were analyzed in six species of major commercial importance Centropomus viridis , Cynoscion othonopterus , Pomadasys macracanthus , Diapterus peruvianus , Lutjanus sp, and Scomberomorus sierra . Chemical techniques were used for the digestion of organic matter and microscopy for its observation. The results showed that four of the six species analyzed C. viridis , C. othonopterus , P. macracanthus, and D. peruvianus presented contamination by microplastics, in the 556 organisms , 163 have 5 different types of particles corresponding to the group of microplastics were found. Nylon (99), > Polyurethane (42), > Polyethylene (14), > Polyethylene Terephthalate (6), > Polyester fibers (2). The omnivorous species consumed 4.0 microplastics, mainly nylon, and the carnivorous species consuming 2.0 microplastics, consuming polyethylene fibers. During the spring it was the highest consumption with 4.4 polyester microplastics on average. This is the first study that reports contamination by microplastics in species of greatest consumption in two lagoon systems in northwestern México , which will be useful to generate sustainable management policies for fish species.
Keywords: Microplastics; Marine fishes; Commercial importance; Lagoon Systems ; northwestern México.