Mystery Surrounds Mass Sardine Die-Off on South Africa's Coasts

In a perplexing ecological event, scientists are probing the mass die-off of sardines observed along South Africa's west and south coasts. This alarming phenomenon has resulted in numerous dead and dying fish washing ashore, leaving the Department of Forestry, Fisheries and the Environment searching for answers.

Preliminary findings have identified the pilchard herpesvirus (PHV) as a key factor, marking the first recorded instance of this virus affecting sardines in the region. PHV, known to cause respiratory issues in fish, has previously led to similar events in Australia during the 1990s. Despite its detection, authorities assure that there is no threat to human health from commercially caught sardines or canned products.

While a majority of the dead sardines exhibited high levels of PHV, live fish displayed a range of the virus, suggesting a complex scenario. Factors such as harmful algae, temperature fluctuations, and low oxygen levels have also been considered, yet evidence increasingly points to PHV as the primary cause. Dalene Vosloo, a biological sciences lecturer, cautions that other environmental changes may have compounded the issue.

Complications have arisen from the die-off, notably impacting the Koeberg Nuclear Power Station, which had to reduce output due to clogged seawater intakes from the dead fish.

Source: www.independent.co.uk