(CNN) At least 35 tons of dead fish appeared in a lake in southern China, leaving residents stunned. The piles of fish washed up in a lake in Hainan province on Wednesday, Chinese state media reported. The change in salinity levels likely occurred after a tide pushed the fish up farther into Hongcheng Lake in the city of Haikou, state-run People's Daily reported. Residents expressed concerns on pollution, but local authorities said the fish died as a result of salinity change. Regional environment officials are still investigating.

Source: CNN May 07, 2016 02:33 UTC