Effects of mine tailings exposure on early life stages of Atlantic cod

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Original languageEnglish
Number of pages9
JournalEnvironmental Toxicology and Chemistry / SETAC
Early online date20 Jun 2019
DOIs
StateE-pub ahead of print - 20 Jun 2019

    Research areas

  • cod, Embryos and larvae, Norway, Mine Tailings, Copper, Gene transcription

Abstract

In Norway, mine tailings waste can be deposited by coastal submarine dispersal. Mine tailings slurry include fine particles <10 µm with elevated levels of metals (e.g. copper, iron) from residual mineral ore. Prolonged suspension of small particles in the water column may bring them into contact with locally spawned pelagic fish eggs, including Atlantic cod, Gadus morhua. Newly‐fertilised cod embryos were exposed to suspended mine tailings particles up to 3.2 mg/L in flow‐through aquaria for a total of 21 days. Significantly more particles adhered to the surface of the chorion from the high treatment after 11 days exposure, and dissolved Cu concentrations increased in the water (up to 0.36 ± 0.06 µg/L). There was no adverse effect on embryo mortality, but an 8 % elevation in larval mortality. There were no differences with treatment on timing of hatching, embryo and larvae morphometrics, abnormalities, or cardiac activity. There was a treatment‐dependent up‐regulation of stress marker genes (hspa8, cyp1c1) but no indication of metal‐induced activation of metallothionien (mt gene transcription). Transcription markers for DNA and histone methyltransferases did show treatment‐related up‐regulation, indicative of altered methylation in larvae when developmental methylation patterns are determined, indicating some level of chronic toxicity that may have longer term effects.

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