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fluorescent microscopic analysis and samplings were performed to investigate their impact on different ontogenetic processes by gene expression analysis.
Ingestion of PE had no effect on mortality but induced a significant decrease (25%) in growth rate. PE microbeads were detected using histological techniques in the gastrointestinal tracts of larvae as long as fish were fed on a diet incorporating microplastic (i.e 26 dph). Any fluorescent beads were found in the larvae 4 days after the end of exposure suggesting that PE microbeads were totally flushed through faeces. Molecular analyses reveal that expression of IGF1 and osteocalcin genes tended to be reduced in fish exposed to PE. This down-regulation of genes involved in fish growth and ossification can be related to the decrease of growth rate observed in these groups.
Altogether, these findings are important in understanding the environmental impact of microplastics present in marine environment on the development of marine fish larvae and, more generally, the possible consequences on the population biology of marine fish species.
|Publication status||Published - 23-Sep-2013|
|Event||ICES ASC 2013 - Reykjavik, Iceland|
Duration: 23-Sep-2013 → 27-Sep-2013
|Conference||ICES ASC 2013|
|Period||23/09/13 → 27/09/13|