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GFA technical crews are the backbone of the program, working long, split shifts each day to maintain the fence and process each fish that passes through, sometimes over 200,000 fish per season.
In 2008, GFA modified a fishwheel for use in the Cranberry River canyon. Goal: capture coho and chinook salmon to obtain a recapture rate from fish marked at downstream Nisga'a fishwheels.
Each year after installation GFA biologist will also snorkel along the entire fence looking for possible openings where salmon could move through undetected.