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Size dependent egestion of polyester fibres in the Dublin Bay Prawn (Nephrops norvegicus)
Summary
Researchers investigated the retention and egestion of polyester microplastic fibres in three sizes (3, 5, and 10 mm) in the Dublin Bay Prawn (Nephrops norvegicus) under controlled laboratory conditions. They found that fibre egestion was size-dependent, with larger fibres retained for longer periods — 10 mm fibres requiring a minimum of 96 hours to egress — providing the first controlled data on MP fibre retention in this commercially important crustacean.
Microplastics (MPs) are an extensive global contaminant in the marine environment, known to be ingested by marine organisms. The presence of MPs in the commercially important marine decapod crustacean Nephrops norvegicus (Dublin Bay Prawn) has been documented for the North-East Atlantic and the Mediterranean, however, uncertainties remain about retention times of MPs in the gastrointestinal tract (GIT) of this species. This study aims to investigate the retention times of polyester MP fibres of three sizes (3, 5, and 10 mm in length) and to determine whether the egestion of MP fibres is size and time dependent. Results suggest that MP fibres of different lengths are retained for different periods of time, with larger MP fibres being retained for longer periods (e.g., minimum 96 h for 10 mm fibres). The present study also assesses for the first time, the size dependent relationship of MP fibres under controlled conditions for N. norvegicus.