I was fishing the Severn last Sunday with six pound line and no8 hook loaded with redworms placed on the edge of the main stream. I hooked into a fish which ran upcurrent and into what appeared to be a hole from which I could not budge him unless I gave him some slack. Once out of his bolt hole he ran down stream for forty odd yards at which point I hauled him in to twenty yards or so before he again ran for his bolt hole in mid water. This happened half a dozen times and each time my trusty old fibreglass rod was bent double when I hauled him back from his run. This went on for half an hour or so. At this point it was very dark and somewhat dangerous on the steep and slippery bank. When at a loss to know what to do he managed to dislodge the hook. Does anyone know what i hooked?.