Thousands of fish drown in Brazilian lagoon after oxygen levels drop!

Dead fish in Brazilian Lagoon

Thousands of dead fish washed up on the shores of the Rodrigo de Freitas Lagoon, a Rio de Janeiro tourist attraction, Brazilian authorities said.

A large amount of organic matter that entered the lagoon as a result of two recent large storms consumed oxygen and brought it down to critically low levels, said Carlos Alberto Muniz, the municipal environment secretary.

This situation caused a massive die-off of shad, whose number had risen since mid-February after the fish had entered the lagoon to spawn, Muniz said.

Source: Thousands of dead fish wash up on Brazilian lagoon