An interesting piece, seeing how far Pike travel is not as much of a suprise to me, a couple of years ago, I was crossing a bridge over the River Calder, and saw 2 pike of about 7 or 8 pounds actually managing to swim up to and cross a wier going upstream, I tried to get photos but they were not hanging around.
So far as Barbel are concerned, I wonder how long “resident “ fish stay in a known area, and how large that area is ?
I have noticed both on the Ribble, the Wye , and the Wharfe that when I have landed a double figure Barbel, so long as I cast to the same place again I can almost guarantee that the next fish will also be a double or big single figure fish, making me think that fish of a similar size do stay together , being double figure fish maybe it gives weight to the theory that the larger females have known groups of maybe a couple or more that basically live together and travel together as well. I do not know how this weighs up against a large river like the Trent, when quite a lot of double figure fish are taken over a season, over quite big distances apart.
David