The shellfish killed in the 11/3 tsunami were 135 years old

A species of clam was discovered in Funakoshi Bay, Iwate Prefecture, after the 2011 earthquake and tsunami, and was judged to be 135 years old when it died, making it among the oldest known to date.

The mollusks survived a succession from the past tsunami until the 9.0-magnitude Great East Japan Earthquake struck the northeastern region of Tohoku, researchers from Kobe University, the University of Tokyo and elsewhere said.

“A 25-meter tsunami hit Funakoshi Bay after the earthquake, rendering it unfit for marine life there,” said Kaoru Kubota, assistant professor of climatology at Kobe University, who is part of the team.

The oyster species, also known as the Stimpson hard oyster or quahog, is known for its longevity and lives in the waters not only off Tohoku and further north in Japan but also in Russia.

It grows in spurs, from June through January of the following year, but stops between February and May. The lifespan of an organism can be determined on the basis of growth rings.

The cross section of the shell shows annual growth rings. (Provided by the University of Tokyo)

The ancient ancient record for the variety collected in Japan’s northernmost Hokkaido Prefecture was 99.

The research team, which was analyzing growth rings on the shells to understand changes in the marine environment, found 27 dead oysters.

In nine of them, the last growth episodes formed in 2010, leading team members to conclude that they perished in the towering tsunami that swept the coast on March 11, 2011.

The clam is the oldest known, measuring over 10 centimeters. It was estimated that he was 135 years old.

It is believed to have survived massive tsunamis, such as those from the 1896 Sanriku earthquake that killed 22,000 people. He was 20 years old at the time. At the age of 57, she also survived the 1933 Sanriku earthquake that left about 3,000 people dead or missing.

The team’s findings were published in the American scientific journal Radiocarbon (https://doi.org/10.1017/RDC.2021.98).

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