Dead fish float in the Rodrigo de Freitas lagoon in Rio de Janeiro, Brazil, Friday, Dec. 21, 2018. About 21 tons of fish died in the Rio de Janeiro lagoon, while city authorities and biologists argue about the cause of the die-off. (AP Photo/Silvia Izquierdo)
Residents of a high-end neighborhood in Rio de Janeiro woke up to the unpleasant smell of 13 tons of rotting dead fish floating in the city's Rodrigo de Freitas lagoon.
Biologists believe that the extreme heat caused by El Nino killed the fish overnight and caused them to wash ashore Friday.
The lagoon played host to several events during the 2016 Olympic games and is a tourist attraction.
Rio's environment ministry released a statement saying that it has been on alert since Thursday morning when oxygen levels in the body of water began to fall sharply.
Biologist and ecosystem specialist Mario Moscatelli says that he inspects the lagoon every year and is convinced that climate change is causing temperature increases.
Dead fish float on the edge of the Rodrigo de Freitas lagoon in Rio de Janeiro, Brazil, Friday, Dec. 21, 2018. About 21 tons of fish died in the Rio de Janeiro lagoon, while city authorities and biologists argue about the cause of the die-off. (AP Photo/Silvia Izquierdo)
Dead fish on the edge of the Rodrigo de Freitas lagoon in Rio de Janeiro, Brazil, Friday, Dec. 21, 2018. About 21 tons of fish died in the Rio de Janeiro lagoon, while city authorities and biologists argue about the cause of the die-off. (AP Photo/Silvia Izquierdo)
Dead fish float in the Rodrigo de Freitas lagoon in Rio de Janeiro, Friday, Dec. 21, 2018. About 21 tons of fish died in the Rio de Janeiro lagoon, while city authorities and biologists argue about the cause of the die-off. (AP Photo/Silvia Izquierdo)
A fish struggles to breathe in the waters of the Rodrigo de Freitas lagoon in Rio de Janeiro, Brazil, Friday, Dec. 21, 2018. About 21 tons of fish died in the Rio de Janeiro lagoon, while city authorities and biologists argue about the cause of the die-off. (AP Photo/Silvia Izquierdo)
A bird perches on a rock surrounded by floating dead fish in the Rodrigo de Freitas lagoon in Rio de Janeiro, Brazil,Friday, Dec. 21, 2018. About 21 tons of fish died in the Rio de Janeiro lagoon, while city authorities and biologists argue about the cause of the die-off. (AP Photo/Silvia Izquierdo)
Dead fish float in the Rodrigo de Freitas lagoon in Rio de Janeiro, Brazil, Friday, Dec. 21, 2018. About 21 tons of fish died in the Rio de Janeiro lagoon, while city authorities and biologists argue about the cause of the die-off. (AP Photo/Silvia Izquierdo)
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