Scientists have recorded an “unprecedented” spike in the fish deformities in the wake of the deadly 2013 train derailment and oil spill in Lac-Mégantic, Que., according to a provincial government report. The report into the effects of the disaster on the 185-km-long Chaudière River, which begins in Lac Mégantic, found that in some parts of the river as many as 47 per cent of the fish they collected had an external deformation.

The rate of deformations greatly surpassed that recorded in a similar fish population study in 1994. The study also found a “marked drop” in the river’s fish biomass, or total weight. “There is no hypothesis other than the oil spill of July 6, 2013 that can explain these results,” says the report, which got little attention when it was released last November. It was brought to wider attention Wednesday when resurrected by Montreal’s Le Devoir newspaper.

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