I had a teacher tell me that communism was okay, Stalin and Mao just got a lot of bad press.
There is no doubt that catching a fish on a hook and line, is stressful, frightening and bewilding for a fish. But I don't think their tiny brains have the capacity to retain that memory for very long. Although that may get used to it. Guys will tell you that fish that are routinely caught tend not to fight too hard. Like the trout up in Fergus or carp in English ponds.