A University of Calgary study warns that our quest to catch the big one is having a profound effect on evolution, writes Tom Spears.
Old-timers who insist that fish don't bite like they used to are right, says a new Canadian study that warns we're killing off the aggressive, fast-growing fish in lakes and oceans.
Aggressive fish chase food harder, grow faster and get caught more often. These, unfortunately, are the fish that would have the largest number of offspring if they lived.
That's likely one reason the northern cod isn't coming back faster, the University of Calgary study suggests: fishing killed off the fittest fish.
http://www.canada.com/ottawacitizen/news/story.html?id=2af065fa-5389-4087-9bb3-7f65f7806af4
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