It all made for a perfect opportunity to study how the trout age. That rules out any effects from changing diet. “They have been catching the same individual fish for decades,” Purchase said.Īs well, the simplified food web in the small lakes means the old fish are eating the same things as the young ones. Scientists have been working in those lakes since 1968, yielding uniquely detailed long-term data sets. Purchase, co-author of a paper published by England’s Royal Society, was studying lake trout in Ontario’s Experimental Lakes Area, a series of isolated watersheds set aside as an open-air biological laboratory. “Theory predicts for samples like ours that there should be little aging,” said Craig Purchase of Newfoundland’s Memorial University. Given the right circumstances, fish get old - decades old - but they don’t age. Research in a set of unique Canadian lakes is backing up a strange consequence of evolutionary theory often predicted but never before shown.
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