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Size matters: ingestion of relatively large microplastics contaminated with environmental pollutants posed little risk for fish health and fillet quality.

Journal article
Authors Giedrė Ašmonaitė
Karin Larsson
Ingrid Undeland
Joachim Sturve
Bethanie Carney Almroth
Published in Environmental science & technology
ISSN 1520-5851
Publication year 2018
Published at Department of Biological and Environmental Sciences
Language en
Links dx.doi.org/10.1021/acs.est.8b04849
www.ncbi.nlm.nih.gov/entrez/query.f...
Subject categories Animal physiology, Toxicology, Molecular biology, Environmental toxicology, Persistent organic compounds

Abstract

In this study, we investigated biological effects associated with ingestion of polystyrene (PS) microplastic (MPs) in fish. We examined whether ingestion of contaminated PS MPs (100-400 µm) results in chemical stress in rainbow trout (Oncorhynchus mykiss) liver and we explored whether this exposure can affect the oxidative stability of the fillet during ice storage. Juvenile rainbow trout were fed for 4 weeks with four different experimental diets: control (1) and feeds containing virgin PS MPs (2) or PS MPs exposed to sewage (3) or harbor (4) effluent. A suite of ecotoxicological biomarkers for oxidative stress and xenobiotic-related pathways was investigated in the hepatic tissue, and included gene expression analyses and enzymatic measurements. The potential impact of MPs exposure on fillet quality was investigated in a storage trial where lipid hydroperoxides, loss of redness and development of rancid odor were assessed as indications of lipid peroxidation. Although, chemical analysis of PS MPs revealed that particles sorb environmental contaminants (e.g. PAHs, nonylphenol and alcohol ethoxylates and others), the ingestion of relatively high doses of these PS MPs did not induce adverse hepatic stress in fish liver. Apart from a small effect on redness loss in fillets, PS MPs ingestion did not affect lipid peroxidation or rancid odor development, thus did not affecting fillet's quality.

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