A significant fish kill happened at the Umhlali River estuary in KwaZulu-Natal, South Africa, on February 12, leading to the death of several hundred fish. The KwaDukuza municipality indicated that various environmental factors including elevated water temperatures, high ammonia levels, and organic pollution are likely contributors. While the investigation continues, initial lab results showed E.coli levels from human sewage were within acceptable limits at the time of testing.

The Department of Water Affairs conducted its own examination alongside local environmental authorities, reinforcing the municipality's findings that high temperatures and low oxygen levels are of particular concern. Preliminary reviews suggest that the ecological health of the river may have been compromised due to a combination of factors rather than a single identifiable cause, prompting ongoing investigations to delve deeper into the multi-faceted challenges affecting this aquatic environment.

This fish kill incident raises significant environmental concerns for the KwaZulu-Natal region, especially considering its implications for local wildlife and fisheries. The findings could influence future environmental management policies to ensure the health of river systems is maintained and to address potential pollution sources effectively. Further investigations are expected to clarify the interactions between temperature, oxygen levels, and pollution, informing better practices for protecting aquatic ecosystems.