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