MONSTER FISH PHOTOS: "Evolution on Steroids" in Congo

MONSTER FISH PHOTOS:
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The Goliath tiger fish, said to grow up to 150 pounds (68 kilograms), may be able to overcome barriers in the tumultuous and turbid Congo River that smaller fish cannot. During a 2008 expedition on the Congo, scientists looked for the "monster" fish upstream and down, to see how far it could travel.

The DNA samples the team collected will help determine if tiger fish found in different parts of the river have morphed into separate species.

The Congo's fish diversity thrilled the scientists. "What we're talking about here is like a species factory--it's a species pump," team leader Melanie Stiassny told National Geographic Television & Film.

"If Darwin had come here, I think we would have had the theory of evolution published a lot sooner."



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—Photograph courtesy Todd Wendel/National Geographic Television
 
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