{
  "id": 1264091,
  "title": "Pilchard herpesvirus detected in mass sardine deaths along the Western Cape",
  "url": "https://urgent.news/2026/08/16/pilchard-herpesvirus-detected-in-mass-sardine-deaths-along-the",
  "topic": "science",
  "section": "Science",
  "published": "2026-08-16T12:19:00.000Z",
  "source": {
    "name": "IOL",
    "slug": "iol",
    "url": "https://iol.co.za/capetimes/news/2026-08-16-pilchard-herpesvirus-detected-in-mass-sardine-deaths-along-the-western-cape/"
  },
  "original_language": "en",
  "account": "Thousands of sardines washing up along the Western Cape coastline have baffled scientists, with the cause of the mass deaths still under investigation. The Department of Forestry, Fisheries, and the Environment (DFFE) has identified pilchard herpesvirus (PHV) in sampled sardines, though this alone may not have been sufficient to trigger the mass mortality. The first reports of dead and dying sardines emerged between Saldanha Bay and Gansbaai, with floating carcasses observed from Hout Bay as far as eight nautical miles offshore. Initial investigations considered disease, environmental conditions, and harmful algal blooms. At the time, a bloom of the potentially toxic algae Alexandrium catenella was present in Saldanha Bay. Nonetheless, the presence of this bloom alone could not explain the widespread mortality. Samples were collected from various locations, including Saldanha Bay, Hout Bay, Betty’s Bay, Gansbaai, and Cape Canyon, as well as from Elands Bay and Lambert’s Bay for comparison. Oceanographic data revealed enhanced upwelling, unusually cold nearshore waters, and low oxygen levels prior to the event. By August 6, no additional dead or dying sardines had been reported, suggesting the mortality event had concluded. Recent testing found no paralytic toxins associated with the Saldanha Bay harmful algal bloom, but low levels of domoic acid and yessotoxin were detected. These findings indicate the likelihood that toxins were not the primary cause of the sardine deaths. PHV, previously unknown in South African sardines, has been linked to large-scale mortality events in Australasia during the 1990s. There is no evidence that PHV can infect humans or other animals, nor does it suggest commercially caught or canned sardines are unsafe. The public is advised not to collect or consume dead or dying fish, or feed them to pets. Ongoing surveillance along South Africa’s West, South, and East coasts will help determine if any impacts were sustained on the sardine population.",
  "summary": "As scientists uncover pilchard herpesvirus in sardines along the Western Cape, the mystery of mass fish deaths deepens, prompting further investigation into environmental impacts.",
  "key_points": [
    "Pilchard herpesvirus (PHV) detected in sardine samples along Western Cape.",
    "Mass mortality event began between Saldanha Bay and Gansbaai.",
    "PHV previously unknown in South African sardines, poses no human health risk."
  ],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}