# Whale Die-Off in Patagonia > Scientists report unusual southern right whale deaths in Argentine Patagonia. - Title: Whale Die-Off in Patagonia · MercoPress | Shortify - Summary: Scientists report unusual southern right whale deaths in Argentine Patagonia. Scientists in Argentina report over 300 southern right whales died this year… - Keywords: southern right whales, argentina, patagonia, whale die-off, red tide, bacterium, news, world, politics, Whale, Die-Off, MercoPress - Source: MercoPress — https://en.mercopress.com/2026/10/21/an-unusual-die-off-of-southern-right-whales-in-argentine-patagonia-alarms-scientists - Read time: 1 min - Topics: southern right whales, argentina, patagonia, whale die-off, red tide, bacterium, news, world, politics ## Unusual whale deaths Scientists in Argentina report over 300 southern right whales died this year, with causes linked to a bacterium and red tide. > Scientists monitoring the southern right whale population at Península Valdés, in Argentina's Chubut province, have recorded since July an unusual number of deaths among calves and adults which, they expect, could make this the worst year on record. ## Causes under study The deaths in calves are linked to a bacterium, while adult causes remain under investigation, with red tide suspected. > In calves, the deaths have been linked to the bacterium Erysipelothrix rhusiopathiae, which causes erysipelas and can enter through wounds, such as gull bites, or through feeding, explained Mariano Coscarella of the Centre for the Study of Marine Systems at the National Scientific and Technical Research Council (Conicet). ## Population impact The whale population in Patagonia has declined from 2,110 in 2025 to 1,375 this year, including 409 calves. > Península Valdés is South America's largest sanctuary for southern right whales. The population visiting it grew from about 500 whales in the late 1990s to a peak of 2,110 in 2025; this year 1,375 were recorded, including 409 calves. ## Key takeaway Scientists in Argentina report over 300 southern right whales died this year, with causes linked to a bacterium and red tide.