I think i would go along with the otter theory but they are strange injuries to say the least, another explanation is that a lot of old machinery has been left in some pits and as it corrodes it leaves razor sharp edges....we have all pulled fish past "snags", is that a possibility Chris?.
Otters? No way, an otter would have left much deeper woulds as they tend to eat the fish without skinning it first! I think it's more likely to have been another pike, same size or a bit bigger. We've all seen the pictures of pike trying to swallow a similar sized relative. I think this is the result this the two fish either becoming separated on their own, or more likely a helpful angler rescued them.
I think it was an otter. I have seen photos of similar damage to carp when otters have skinned one whole flank, with claw marks in the opposing flank.
I think what they do is grasp the prey fish with their front claws and then strip the skin with their teeth. When carp first were subject to attack by otters the damage was very similar to this photograph and it was some time before otters were found to be the cause.
Unfortunatly I was unable to view the pictures,is that you or me? Recent articles in Carpworld leave me in no doubt, that an Otter could cause serious damage to a fish many times larger than the one in question. There is no doubt that they can catch and kill large carp. A pike with its smaller girth should in theory, be potential pray. Otters have been reintroduced into our river systems, that no longer have the biomass of fish to sustain them. This has led to otters raiding still waters for their fish, which have no defence against such an efficient preditor. And we thought Cormarants were a problem!