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Old 03-10-2017, 07:33 PM   #1
Connecticut Yankee
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Hope for Wild Brookies

While planning for a canoe/camping/fishing trip to Algonquin PP this summer I came across this bit of info, Hope springs eternal !

By the way, the direct link to the journal article itself is*http://onlinelibrary.wiley.com/enhan...111/eva.12199/ , or*http://onlinelibrary.wiley.com/doi/1...eva.12199/epdf for pdf.

Overfishing, climate change and pollution have reduced fish populations in Canadian lakes and rivers. While hatchery-raised fish could return numbers to normal, they aren't as well adapted to their new environments, and there's been concern that the wild population is "tainted" once it breeds with its domesticated counterparts.

But new research from Concordia, published in the journal Evolutionary Applications, shows that after a few generations of breeding and natural selection, these hybrid fish are genetically as robust as their purely wild forefathers.Fishing for resultsUnder the leadership of biology professor Dylan Fraser, the research team -- which included Concordia graduate student Andrew Harbicht and research scientist Chris Wilson from the Ontario Ministry of Natural Resources and Forestry -- headed to Algonquin Provincial Park, a fisherman's paradise of lakes stocked generations ago with hatchery salmon and trout.

The team transplanted combinations of wild, domesticated and hybridized populations of Algonquin Park vbrook trout to new environments. The researchers then compared survival rates and physical characteristics to determine whether hybridization affects a fish's potential to adapt after multiple generations of natural selection in the wild.

It turns out that within five to 11 generations of fish (about 25 to 50 years), the foreign genes introduced into wild populations through hybridization are removed by natural selection. That means fish populations previously bolstered by hatchery stock are, genetically speaking, indistinguishable from purely wild populations.

The implications for conservationFraser, himself an avid fisherman, says these results provide hope for wild populations that were initially negatively affected by human-induced hybridization."If we can stop the incoming flow of foreign genes while maintaining an environment similar to what was there pre-hybridization, wild populations are likely to recover -- possibly in less time than previously thought," he says.

http://www.sciencedaily.com/releases...1104111536.htm
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Old 03-10-2017, 10:54 PM   #2
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Very interesting find! I sure hope this holds true.
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Old 03-10-2017, 11:12 PM   #3
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Know your Limit

[QUOTE=Connecticut Yankee;256722]While planning for a canoe/camping/fishing trip to Algonquin PP this summer I came across this bit of info, Hope springs eternal !


My limit is a few small ones for a meal...and let the Big ones free to make more meals!!

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Old 03-11-2017, 08:29 PM   #4
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I fish 2 lakes that had native trout but were also stocked for at least 50 years and subject to standard regulations; baitfish allowed, winter fishing allowed. In the 80's they stopped stocking it and now its no bait, no ice fishing and closed for spawning. Its amazing the trout and lake survived intact. The native trout don't seem to get as big as they do in stocked ponds. A 5 lbs. or better trout is not uncommon in stocked ponds in that area. The natives while a good average size top off at about 18".
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