Thousands of dead fish have begun mysteriously washing up in the polluted Rio bay that will host sailing events at the 2016 Olympics—and experts are at a loss to explain why.
Guanabara Bay has already been the subject of concern amongst sailors who are to compete in Rio because of the human sewage that gets pumped into its waters.
The International Olympic Committee (IOC) has expressed confidence that Guanabara will be fit for purpose by the time of the games.
But the recent appearance of thousands of dead fish, and the foul stench of their rotting carcasses, has attracted further scrutiny with the Olympics less than two years away.
Scientists are baffled by the phenomenon but say there is no evidence so far to suggest pollution is the cause.
The foul odor first took over the usually peaceful Paqueta Island, where cars are banned and the population of 4,500 people travels on horseback or bicycle among the only baobab trees in Brazil.
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