Massive fish – weighing 300 pounds – washes up dead at Washington Lake. What is it?

A massive fish weighing more than 300 pounds washed up on the side of a Washington lake, wildlife officials.

Now his death is under investigation.

The white sturgeon was found Sept. 6 near Lake Washington at Log Boom Park in Kenmore, the Washington Department of Fish and Wildlife said in a Sept. 15 email.

It measured 8.2 feet tall, weighed an estimated 300 to 400 pounds and was 60 to 80 years old, according to an initial necropsy report.

A scientist and biologist dissected the fish and learned that it was a female with some shells in her stomach.

In addition, a University of Washington researcher took tissue samples to test for parasites, officials said. A scientist with the National Oceanic and Atmospheric Administration also took a sample for a toxicology report.

Fish is common in Washington

A cause of death has not been determined, officials said.

However, the massive creature is common in Washington, officials said.

“They are not unexpected, but certainly interesting examples of the variety of fish large and small that live in Washington state,” officials said.

White sturgeon live in lakes and rivers across the Pacific Northwest, including in Lake Washington, wildlife officials said.

They can live in both saltwater and freshwater and can measure up to 10 feet long and weigh up to 1,000 pounds.

These species are listed under the Species of Greatest Conservation Need.

Kenmore is located about 15 miles northeast of Seattle.