Well said Hatter:
but unfortunately there are anglers amongst us that still demand that science proves that otters have a detrimental effect on barbel populations, and will not accept any anecdotal evidence.
Otters without doubt have caused the total collapse of barbel populations on many rivers by the systematic predation and selective targeting of the fewer in number sexual mature female barbel, by the otter.
So we as barbel anglers end up continually battling with each other, the Wild Otter trust must wring their hands with glee as some anglers continue to believe otters aren't a problem, and other anglers ( like me) believe that the otter are a curse on our riverine and lakeside environments...but as i have said, its too late, the situation is worse today than what it was yesterday. I will never understand how any barbel angler can endorse the presence of any otters on any barbel river...