>>1068582britbong here
the fishing scene is pretty dire for freshwater, it's a real old boys club in a lot of places.
one of my buddies had membership applications rejected for the local club (you have to be a club member to fish in a lot of places) just because he's not well-to-do enough ( he could pay the membership ect no worries)
as it's nearly all catch an release.
After 2 kick backs he figured out what was going on and why he wasn't getting on... he packed his tackle bag one night and took a big ass fermentation bucket with him. I got a snapchat from him just after midnight and he'd been over to one of the bigger lakes here , caught a good sized fuckin pike and popped it into the fermentation bucket.
he drove the 20 odd miles back to the club's prize pond ( 30lb+ carp) and released the pike.
what happened was pretty obvious, but it took them 2 restocks to figure it out and catch the pike.
the club is still an arse hole club sadly :( it's why I beach fish
tl:dr
know what's already in the pond before you 'stock' it