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Microplastic occurrence in finfish and shellfish from the mangroves of the northern Gulf of Oman
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This study assessed microplastic pollution in finfish and shellfish from mangrove habitats in the northern Gulf of Oman, finding the highest prevalence in crabs, with fragments and fibers as the dominant particle types, confirming microplastic contamination in ecologically important coastal ecosystems.
This study was conducted to assess microplastic (MP) pollution in some aquatic animals inhabiting planted and natural mangrove swamps in the northern Gulf of Oman. The KOH-NaI solution was used to retrieve MPs from the gastrointestinal tracts of animals. The highest MP prevalence was recorded in crabs (41.65 %) followed by fish (33.89 %) and oysters (20.8 %). The abundance of MPs in examined animals varied from zero in Sphyraena putnamae to 11 particles in a Rhinoptera javanica specimen. When polluted-only animals were considered, the mean abundance of MPs significantly varied among species and between locations. The mean density of ingested MPs was higher in the planted mangrove animals (1.79 ± 2.89 vs. 1.21 ± 2.25 n/individual; mean ± SD). Among the examined fish species, R. javanica ingested the highest number of MPs (3.83 ± 3.93 n/individual; mean ± SD). The polyethylene/ polypropylene fragments or fibers of average 1900 μm size were recorded as predominant (>50 % occurrence) MP particles.
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Microplastic contamination in mangrove sediments along the Persian Gulf and Gulf of Oman coasts was characterized, revealing widespread pollution dominated by fibers and fragments, with ecological risk assessments indicating moderate to high risk levels across multiple sites.
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Small microplastic particles were documented in mangrove ecosystem sediments along the northern Persian Gulf coast, with polymer types and contamination levels reflecting regional plastic use and ocean current transport patterns. The study adds to evidence that mangrove sediments in the Middle East are accumulating microplastic pollution, threatening these ecologically important coastal habitats.
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Microplastic contamination in commercially important marine fishes from the Sohar Coast, Sea of Oman: occurrence, characterization, and polymer composition
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Researchers examined 120 fish from four commercially important species caught off Oman's Sohar coast and found microplastics in the gut or gills of nearly 80% of them. Most particles were fibers under 2mm long, with polyester being the most common plastic type found.
Assessing microplastic pollution in coastal sediments of the Oman Sea: ecological risk and land-use linkages
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A survey of coastal sediments along the Oman Sea shoreline near Chabahar, Iran, found microplastic concentrations varied dramatically by land use—commercial port and market areas had up to 161 particles per 100 grams of sediment, while remote mangrove forests had as few as 6 particles per 100 grams. Fibers and fragments of polyethylene, polypropylene, and nylon were most common. The clear gradient from urbanized to natural areas confirms that human activity is the primary driver of coastal microplastic accumulation, and that mangrove ecosystems—despite their ecological importance—are not immune to plastic contamination.
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