I do sympathise, but if nothing occurs, as is the trend at present I don’t think there will be enough left to find such a balance. Otters aren’t an aquatic organism, they aren’t obligate feeders but very opportunistic and to put it simply will survive regardless of the environment. The only threat to an otter is man, without that (rightly or wrongly) they are pretty free to decimate already precarious fish stocks.
I’ve said it before but the angle on this process is off kilter. We can see a problem, the otter, but the problem is larger and that is that our natural stocks of fish in our water ways are under threat. That has to be proved and then the ball thrown back at policies makers and environmentalists “you tell us our rivers are the healthiest they’ve been, if so, why are the fish not reflecting this.” This question must be answered.