(AP) -
About four out of 10 freshwater fish species in North America are in peril, says a major study by US, 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 notice the dramatic dwindling deep in 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.
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