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Giant Prehistoric Fish Rebounding in Canada
Stefan Lovgren in Chilliwack, Canada
for National Geographic News
November 13, 2008

This is the ninth story in an award-winning, continuing series on the Megafishes Project. Join National Geographic News on the trail with project leader Zeb Hogan as he tracks down the world's largest freshwater fishes.

When dozens of white sturgeon began washing up dead on the banks of British Columbia's Fraser River in the mid-1990s, some feared that North America's largest freshwater fish could be headed toward extinction.



Once plentiful in the river, the sturgeon population had dropped below 40,000, and scientists were unable to explain the die-offs of mostly female fish.

That's when an alliance of government agencies, environmentalists, aboriginal groups, and commercial and recreational fishers came together to save the sturgeon, spurring a robust recovery of the lower Fraser River population.

Recent estimates show the population has increased to about 50,000 fish.

To Zeb Hogan, who leads National Geographic's Megafishes Project and has studied the sturgeon, it's a rare success story. (Learn about the world's gargantuan freshwater fish.)

"Worldwide, most species of large freshwater fish are in danger of going extinct in the near future," said Hogan, a National Geographic emerging explorer. (The National Geographic Society operates National Geographic News.)

"The white sturgeon seems to have avoided the fate of species like the Chinese paddlefish of the Yangtze River and the critically endangered giant catfish of the Mekong River."