Bioaccumulation and reproductive effects of fluorescent microplastics in medaka fish

Mona Assas, Xuchun Qiu, Kun Chen, Hijiri Ogawa, Hai Xu, Yohei Shimasaki, Yuji Oshima

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)


This study was performed to elucidate the uptake and bioaccumulation of polystyrene microplastics (PS-MPs) in Japanese medaka (freshwater fish) and Java medaka (marine fish), and to assess its impacts on the survival, reproduction, and gene expression of Japanese medaka. Both species were exposed to 2-μm fluorescent PS-MPs (107 beads/L) for 3 weeks. The bioaccumulation factor of PS-MPs for Java medaka was calculated at about 4 × 102, higher than that for Japanese medaka (about 1 × 102). The exposure had no significant effects on the survival and reproduction of Japanese medaka. The mRNA sequencing analysis showed that the expression of a few genes involved in the cell adhesion, xenobiotic metabolic process, brain development, and other functions in medaka intestines significantly changed after exposure. These results suggest that virgin PS-MPs can potentially accumulate in medaka intestines, but has limited toxicity to Japanese medaka at the concentration up to 107 beads/L.

Original languageEnglish
Article number111446
JournalMarine Pollution Bulletin
Publication statusPublished - Sept 2020

All Science Journal Classification (ASJC) codes

  • Oceanography
  • Aquatic Science
  • Pollution


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