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Occurrence and Visual Characteristics of Suspected Microplastics in the Gastrointestinal Tract of Wild Rabbitfish (Siganus guttatus) from Tamisan, Pujada Bay, Philippines

East Asian Journal of Multidisciplinary Research 2026
Chella May Sison, Eleanor Vilela

Summary

Scientists found tiny plastic fibers, mostly blue, in the guts of about 1 in 4 wild rabbitfish caught in a Philippine bay — a popular fish for local diets. While this study didn't test whether these fibers make it into the parts of the fish people actually eat, it's a reminder that plastic pollution is working its way into seafood, adding to the case for reducing plastic waste that ends up in our oceans.

Body Systems

Microplastic pollution threatens coastal ecosystems through ingestion by marine organisms. This study assessed the occurrence and characteristics of suspected microplastics in the gastrointestinal tract of wild rabbitfish (Siganus guttatus) from Tamisan, Pujada Bay. Sixty samples were collected and analyzed using KOH digestion, filtration, and stereomicroscopy. Microplastics were identified based on morphology and color over the sampling period, without FTIR confirmation due to size limitations. Results showed 26.7% occurrence (16/60), with a mean of 0.27 ± 0.45 particles per fish. Fibers dominated (87.5%), with blue as the most frequent color. These findings indicate exposure of wild rabbitfish to microplastics and highlight the need for continued monitoring and polymer confirmation.

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