Mexico investigates mass fish death in lagoon

September 1, 2014
Fishermen collect dead "popocha" fish at the Cajititlan lagoon in Tlajomulco de Zuniga, Jalisco State, Mexico, on September 1, 2014

At least 48 tonnes of fish have turned up dead in a lagoon in western Mexico and authorities are investigating whether a wastewater treatment plant is to blame.

Officials in the state of Jalisco said late Sunday it was the fourth case of at the Cajititlan lagoon this year in the town of Tlajomulco, south of Guadalajara.

Magdalena Ruiz Mejia, the state's environment secretary, said it was a "grave phenomenon" and that it would take two more days to remove the fish, which began to appear dead last week.

The Tlajomulco municipality said the deaths were due to a drop in oxygen due to a cyclical change in water temperature.

But Ruiz Mejia said such deaths were "more and more" frequent and intense due to "bad management of the body of water." Authorities are checking local .

In a separate incident in July 2013, thousands of died in a Jalisco reservoir after a company that made food for livestock without a permit dumped huge amounts of molasses into the .

Explore further: Thousands of fish die in contaminated Mexico reservoir

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