The Possible Extinction Of North America's Freshwater Fish

Freshwater Fish In N. America In Peril, Study Says
-- Yahoo News/AP

WASHINGTON - About four out of 10 freshwater fish species in North America are in peril, according to a major study by U.S., Canadian and Mexican scientists.

And the number of subspecies of fish populations in trouble has nearly doubled since 1989, the new report says.

One biologist called it "silent extinctions" because few people notice the dramatic dwindling of certain populations deep in American lakes, rivers and streams. And while they are unaware, people are the chief cause of the problem by polluting and damming freshwater habitats, experts said.

In the first massive study of freshwater fish on the continent in 19 years, an international team of dozens of scientists looked not just at species, but at subspecies — physically distinct populations restricted to certain geographic areas. The decline is even more notable among these smaller groups.

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