Scientists Investigate Deaths of 1,000 Caspian Sea Seals

More than 1,000 seal carcasses have washed ashore along a stretch of the Caspian Sea coast in the last month, according to the Kazakh government. The mass death of seals in the area has previously been reported, and similar events have occurred over the years. But new data from the Ministry of Agriculture reveals the large scale of the latest losses as scientists study tissue samples taken from the carcasses to find out why the seals died. “The Fisheries Committee suggests that natural phenomena, including natural gas emissions caused by underwater earthquakes, might be the reason behind the deaths,” the ministry said on Thursday. “Final conclusions regarding the causes of the seal deaths will be determined after laboratory tests are completed, which, according to scientific organizations, will take 3–4 months.” Fisheries officials discovered 1,034 seal carcasses along the coast in the Tupkaragan district of the Mangystau region of western Kazakhstan between Oct. 24 and Nov. 13, according to the ministry. So far, tests of tissue samples are negative for a number of infectious diseases. Kazakh officials attributed the deaths of nearly 200 seals in late 2022 to pneumonia, while noting that environmental pollution in the Caspian Sea had made their immunity systems more vulnerable to infectious diseases. Concerns about the impact of oil extraction, industrial waste and other environmental damage on the sea’s ecoystem are increasing. Scientists have recorded mass deaths of seals in the Caspian Sea for more than two decades. In 2000, the deaths of about 10,000 seals was attributed to chronic toxicosis.