Rare western Pacific gray whale is tracked by scientists on his migration from Russia to Alaska


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ANCHORAGE — A highly endangered whale is making good time as it continues its journey east from Russian waters toward Alaska.

U.S. and Russia researchers have tracked the 13-year-old male western Pacific gray whale to a location about 80 miles north of St. Paul Island, part of Alaska’s Pribilof Islands in the Bering Sea.


Bruce Mate, director of Oregon State University’s Marine Mammal Institute, said the whale was detected there Thursday. Foul weather has hampered updates from the satellite-monitored radio tag affixed to the whale by researchers in September.

‘The weather out there is really crummy,’ he said.

Researchers have been tracking the whale since they tagged it off Russia’s Sakhalin Island. They had hoped to tag 12 western Pacific gray whales but were limited to one, on the last day of field work, by typhoons and gales.

Western Pacific gray whales are the second-most-threatened species of large whale after North Pacific right whales. Just 130 of the animals remain. They spend summers near Sahkalin Island at the south end of the Sea of Okhotsk, but little is known of their winter habits.

In contrast, eastern Pacific gray whales number about 18,000 animals. They breed and give birth in warm water, mostly along Baja California, and migrate north to spend summers on feeding grounds in Alaska’s Bering, Chukchi and Beaufort seas.

Part of what’s surprising about the tagged whale is that it’s swimming faster than the eastern north Pacific population migrating south this time of year at about 2.5 mph.

‘Here he is at a little more than four and a half miles an hour, and over an extended period of time,’ Mate said. ‘He appears to be highly motivated.’

Dubbed Flex, the whale left Russia’s Kamchatka Peninsula coast Jan. 3 and swam east. By Jan. 9 it had swum 750 miles to the edge of the Bering Sea shelf north of the Aleutians, where waters decrease in depth from about 13,000 feet to about 240 feet.

The whale swam an additonal 300 miles east last week to the location north of the Pribilofs. It then turned south.

The tag remains on the whale, Mate said, but if it surfaces in a trough between 30-foot waves, the satellite may not receive enough signals to pinpoint the whale’s location by measuring shifts in frequency.

‘We do get individual messages, but those aren’t enough to determine location,’ he said.

Scientists have been monitoring Flex since he showed up as a calf with his mother in 1997. It’s unknown if the whale has company on its journey, but baleen whales generally do not travel together.

Mate is eager to confirm Flex’s new location. If it continued south, the whale could be in the Aleutian Islands by now.

‘That’s part of the excitement as a scientist, when we do something like this, is that next to God and the whale, I’m the next one to know,’ he said. ‘I look forward to each daily episode as a new chapter in surprise and excitement.’

The public can track the whale on Oregon State’s website. It’s updated every Monday.

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-- Dan Joling, Associated Press