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Microplastics in different tissues of a pelagic squid (Dosidicus gigas) in the northern Humboldt Current ecosystem
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Microplastics were identified in multiple tissues of the Humboldt squid from the northern Humboldt Current ecosystem, including digestive gland, mantle, and gills, indicating systemic exposure beyond the gut in this commercially important cephalopod.
Microplastics (MPs) found in marine invertebrates have aroused great concern, but MP ingestion by cephalopods is rare. To evaluate MP contamination in commercially important pelagic squids, we examined the abundance and characteristics of MPs in the gill, intestine, and stomach of jumbo squid Dosidicus gigas (30.9 to 65.0 cm mantle length), collected from the northern Humboldt Current. The average abundance ranged from 4.0 to 7.4 items/individual and 0.2 to 0.7 items/g wet weight for the three tissues. The MPs were sized 80.75 to 4632.27 μm, with larger MPs generally found in the stomach. The majority of MPs were fibrous in shape, blue or black-gray in color, and cellophane in composition. These results revealed the MP distribution in D. gigas and could be driven by its movement pattern and habitat use. Furthermore, this study provides evidence that adherence to gills is probably an alternative means by which pelagic squid accumulate MPs.
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Researchers examined microplastics in the stomachs of jumbo squid from the eastern tropical Pacific Ocean, finding contamination in most specimens with fragment and fiber types dominating, and conducted a preliminary risk assessment highlighting the potential for microplastic trophic transfer in this commercially important pelagic species.
[Microplastics in the stomach and intestine of pelagic squid: A case study of Dosidicus gigas in open sea of Peru].
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Researchers found microplastics in the stomachs and intestines of jumbo squid (Dosidicus gigas) caught in the open sea of Peru, with fiber-shaped particles in blue or black dominating and similar contamination levels in both sexes. The study extends knowledge of microplastic ingestion to large pelagic cephalopods that support a major commercial fishery in the Eastern Pacific.
Microplastic ingestion and plastic additive detection in pelagic squid and fish: Implications for bioindicators and plastic tracers in open oceanic food webs
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Researchers examined microplastic ingestion in fish and squid from the open Northeast Atlantic and detected phthalate plasticizers in their tissues. Both fish species and all three squid species had ingested microplastics, with fibers being the most common type. The presence of plastic additives in these open-ocean species suggests that microplastic contamination and associated chemical exposure extend well beyond coastal areas into the deep ocean food web.
Microplastic intake in epi- and mesopelagic fish and squid species from an oceanic environment (NE Atlantic)
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Researchers investigated microplastic ingestion in epi- and mesopelagic fish and squid species from the open NE Atlantic Ocean, documenting contamination in oceanic species that may confuse microplastics with similarly sized and colored planktonic prey.
Little evidence for bioaccumulation or biomagnification of microplastics in a deep-sea food web
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Researchers examined microplastic contamination in both gastrointestinal tracts and non-GI tissues of six marine species across multiple trophic levels sampled in a deep-sea food web in Monterey Bay, California, including tuna crab, market squid, northern lampfish, chub mackerel, California halibut, and Chinook salmon. After chemical digestion, they found little evidence for bioaccumulation or biomagnification of microplastics in tissues outside the gastrointestinal tract.
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