I have a pond that was originally stocked
with 700 catfish, and is rarely fished, maybe
twice a year. They bite fairly well each time
that they are fish for, but stop after that.
It takes 3 or 4 days for them to even get back
to accepting surface feed again. I had to
buy fish from a store last 4th of July for
a cookout, just couldn't get a thing to bite.
I'm guessing that some type of mass stress
condition from the hooking and catching of
a few fish affects the entire pond. But, some
of the fish are quite large and swimming
around with hooks and broken line still in
their mouth. Maybe there is some type of
communication going on there.