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Investigation of microplastic accumulation in Rastrelliger kanagurta fish gut and microplastic degradation behaviour of existing gut bacteria Pseudomonas sp.
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Researchers found microplastic accumulation in the gut of Indian mackerel fish and identified a Pseudomonas species from the gut bacteria capable of degrading nylon microplastics, suggesting a potential probiotic role in microplastic breakdown.
Microplastic is a minute particle of chemical pollutant in marine environment and classified as less than 5 mm size. The microplastics could not degrade for long years and they are ingested, incorporated, and accumulated in tissues of living organisms, particularly can cause various ecotoxicological effects for their behavioural change, cytotoxicity, neuro-toxicity effects, liver stress, etc. This preliminary study was investigated the abundance and accumulation of microplastic in marine fish of Indian mackerel (Rastrelliger kanagurta) gut region. Further, we identified the microplastic through stereomicroscope in Indian mackerel fish size up to 0.02 mm. In FT-IR analysis were identified the chemical group which were represents as nylon. In GC-MS analysis were identified that hexa decanoic acid and methyl ester plastic compounds as well as identify and screened the microplastic degrading bacteria from fish gut through partial 16S rRNA gene sequencing analysis it was shows that the isolate reveals a Pseudomonas sp. As a result, it is possible that gut bacteria have a probiotic role in fish gut to may degrade microplastics.
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Nylon strips ingested and excreted by wild fish were found to harbor adherent microbiota including potential pathogens, demonstrating that microplastics can vector microorganisms through fish gut passage and into aquatic environments.
Analisis Mikroplastik Pada Saluran Pencernaan Ikan Kembung (Rastrelliger Sp.) di Pelabuhan Perikanan Samudera Belawan, Sumatera Utara
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Indonesian researchers analyzed microplastics in the digestive tracts of mackerel fish landed at Belawan fishing port, examining both the characteristics of particles and their relationship to fish size. The presence of microplastics in commercially important fish species represents a direct pathway for human dietary exposure.
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Researchers found that microplastics in golden pompano aquaculture areas colonize with distinct microbial communities that overlap with the fish's gut microbiota, increasing Proteobacteria and decreasing Firmicutes in the intestinal flora of fish living in more contaminated estuarine settings.
Understanding the links between micro/nanoplastics-induced gut microbes dysbiosis and potential diseases in fish: A review
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This review examines how microplastics and nanoplastics accumulate in fish intestines and disrupt their gut bacteria, potentially leading to inflammation, immune problems, and metabolic diseases. The disrupted gut microbiome can weaken the intestinal barrier, allowing harmful substances to enter the fish's body. Since fish are a major protein source for billions of people, understanding how microplastics damage fish gut health is important for assessing risks to human food safety.
Identification of a polyethene-interacting gut-associated bacterium from microplastic-exposed freshwater Labeo rohita
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Fish living in ponds near cities in India had much higher levels of microplastic contamination than those in rural ponds, and this pollution was linked to early damage in the fish's gut tissue, a warning sign for the health of fish humans eat. On a hopeful note, researchers also discovered a gut bacterium that can physically break down polyethylene plastic, hinting at a possible future tool for cleaning up plastic pollution before it works its way further up the food chain.
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