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Microplastic contamination in the Skipjack Tuna (Euthynnus affinis) collected from Southern Coast of Java, Indonesia
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Researchers examined the digestive tracts of skipjack tuna collected from the southern coast of Java, Indonesia, and found microplastics present in all sampled fish. The most common microplastics were fibers and fragments, primarily made of polyethylene and polypropylene. The findings raise concerns about microplastic contamination in commercially important fish species consumed by humans in the region.
Indonesia is the second-largest contributor of microplastics (MPs) pollution in the marine ecosystem. Most MPs pollution-related studies in Indonesia focus on seawater, sediment, with less information found on the commercially important fish species used for human consumption. Skipjack Tuna (Euthynnus affinis) is one of the major exporting fishery commodities from Indonesia. This exploratory study aimed to determine MPs presence in the digestive tract of Skipjack Tuna from the Southern Coast of Java, Indonesia. The fish samples were collected from five different fish traditional auction market along the Southern Coast of Java, Indonesia, namely Pangandaran, Pamayang Sari, Ciletuh, Santolo, and Palabuhan Ratu. The gastrointestinal tract of Skipjack tuna was pretreated using alkaline destruction and filtered. The presence of MPs in the treated samples was visually identified using an optical microscope, while Polybrominated diphenyl ethers (PBDEs) contaminants were analyzed using Gas Chromatography-Mass Spectrometry (GC-MS). A total of 19 suspected MPs particles were found in the form of filament (84%), angular (11%), and round (5%). This result would provide a better indication of the MPs contamination in marine life species in the Southern Coast of Java, Indonesia, as useful information for marine environmental monitoring program in the future.
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Researchers analyzed the abundance and composition of microplastics in the digestive tracts of skipjack tuna (Katsuwonus pelamis) collected from Muara Angke Fish Auction in Indonesia, using 10% KOH digestion to extract microplastics and assess contamination levels in a commercially important marine species.
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Researchers dissected skipjack tuna from a West Aceh fishing port and detected microplastics in both flesh and digestive tracts, with fibers averaging 73 particles per gram in muscle tissue; FTIR analysis identified polyamide (nylon) — sourced from fishing gear — as the dominant polymer, indicating contamination of fish consumed by local coastal communities.
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Scientists checked tuna caught off the coast of Mataram, Indonesia and found tiny plastic bits (microplastics) in every fish's gut, averaging about 2 pieces per fish — mostly tiny black fibers, likely shed from things like synthetic clothing or fishing nets. Since tuna is a popular food fish, this suggests some of that plastic could end up on our plates too, though more research is needed to know exactly how much risk this poses to human health.
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