Speaking for the rivers I fish on, I would say there were a lot more trout in them than now.
Also, not as many fishermen tramping the banks.
I have seen records from the Red Lion Hotel at Armathwaite, now the Fox and Pheasant, back in the 60's.
My parents owned and ran it for many years, and some of the photos of salmon caught in those days, and the frequency, was remarkable.
We had good spring runs then, a thing of the past now.
I used to fish the Eden in the 60's and fish were definitely more plentiful in those days.
As for tackle, I can only say that having fished with my late fathers 9ft cane rod for a day, I am so pleased carbon rods are now in existence.

S.