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Fish die-off hits Rio de Janeiro lake that will host Olympic rowing competitions

  • A can floats amid dead fish at the Rodrigo de Freitas lagoon in Rio de Janeiro, Brazil, Monday, April 13, 2015. Rio de Janeiro's waste management company is cleaning up dead fish after a die-off at a lake that's slated to hold Olympic rowing competitions during the 2016 games. Fish die-offs are a frequent occurrence in Rio's waterways, which are filled with raw sewage and garbage. The city's environmental secretariat said the latest incident is the result of recent rains and high sea levels, which caused the lake's water temperature to plummet. (AP Photo/Silvia Izquierdo)

    A can floats amid dead fish at the Rodrigo de Freitas lagoon in Rio de Janeiro, Brazil, Monday, April 13, 2015. Rio de Janeiro's waste management company is cleaning up dead fish after a die-off at a lake that's slated to hold Olympic rowing competitions during the 2016 games. Fish die-offs are a frequent occurrence in Rio's waterways, which are filled with raw sewage and garbage. The city's environmental secretariat said the latest incident is the result of recent rains and high sea levels, which caused the lake's water temperature to plummet. (AP Photo/Silvia Izquierdo)  (The Associated Press)

  • Dead fish float on the Rodrigo de Freitas lagoon in Rio de Janeiro, Brazil, Monday, April 13, 2015. Rio de Janeiro's waste management company is cleaning up dead fish after a die-off at a lake that's slated to hold Olympic rowing competitions during the 2016 games. The city's environmental secretariat said the latest incident is the result of recent rains and high sea levels, which caused the lake's water temperature to plummet. (AP Photo/Silvia Izquierdo)

    Dead fish float on the Rodrigo de Freitas lagoon in Rio de Janeiro, Brazil, Monday, April 13, 2015. Rio de Janeiro's waste management company is cleaning up dead fish after a die-off at a lake that's slated to hold Olympic rowing competitions during the 2016 games. The city's environmental secretariat said the latest incident is the result of recent rains and high sea levels, which caused the lake's water temperature to plummet. (AP Photo/Silvia Izquierdo)  (The Associated Press)

  • Vultures feed on dead fish on the shore of the Rodrigo de Freitas lagoon in Rio de Janeiro, Brazil, Monday, April 13, 2015. Fish die-offs are a frequent occurrence in Rio’s waterways, which are choked with raw sewage and garbage. The latest incident, affecting thousands of small silvery fish called twaite shad, began several days ago at the lagoon where the Olympic canoeing and rowing events are to be held. (AP Photo/Silvia Izquierdo)

    Vultures feed on dead fish on the shore of the Rodrigo de Freitas lagoon in Rio de Janeiro, Brazil, Monday, April 13, 2015. Fish die-offs are a frequent occurrence in Rio’s waterways, which are choked with raw sewage and garbage. The latest incident, affecting thousands of small silvery fish called twaite shad, began several days ago at the lagoon where the Olympic canoeing and rowing events are to be held. (AP Photo/Silvia Izquierdo)  (The Associated Press)

Rio de Janeiro's waste management company is cleaning up dead fish after a die-off at a lake that's slated to hold Olympic rowing competitions during the 2016 games.

Dead fish have been washing up on the banks of the Rodrigo de Freitas lake for several days.

Fish die-offs are a frequent occurrence in Rio's waterways, which are filled with raw sewage and garbage.

The city's environmental secretariat said the latest incident is the result of recent rains and high sea levels, which caused the lake's water temperature to plummet.

Rio's water quality has become a contentious topic ahead of the Olympics, which will see sailing, rowing and other events.

Authorities had pledged to clean up the water ahead of the games, but now admit those promises won't be met.