yet another predetor

Been hearing reports of seals present in the river Tees above the barrage. I fish Stockton B section waters mainly Newsham and the Dovecote and so far this season have not personally seen a seal. Last Friday while on the Worsall pumping station saw what at first approaching from upstream was an otter(just its head out of water). No it was a large seal.
Just how many specimen sized fish can a creature this size consume?
How far upstream have they gone?
Seals, otters, gosanders, mink, cormorants and signal crayfish.
Oh and eastern Europeans, what next?
No wounder most fishermen now go to commercials.

There's some heart breaking sights when nature's boundaries are blurred...

https://www.youtube.com/watch?v=b7_jXK3ufq8

"Bring some biscuits"
Did he want to feed the seal or the carp?
Or did he want a biscuit himself while he watched....?

With the exception of cormorants, the other 3 have been on and coming into the rivers for 1000s of years. It's only since the creation and general availability of accurate firearms (seals & gooseander) their numbers have been controlled.

At this time of year in 'some areas' due to depleted sea fish stocks, the seals follow the runs of salmon into and up the rivers, as that its the most likely food resource available to them. The North sea should teem with fish this time of year but it no longer does. The reason over-explotation by us man!