Dang eagles will flat do a number on fish that come to surface,,, anything under 2 bs are in danger,,
eagles
ospreys
great blue herons
crested night herons
seagulls
king fishers
cormorants
if the pond is big, pelicans (God help you)
Then:
mink
otters
coons
2 lbs is not a safe limit. I've seen pelicans killed with 26" trout inside. Otters will take anything they want.
Once a critter discovers the buffet, they tend to invite all their buddies for a party.....
Don't get caught shooting any of them, except the coons....