hello; My neighbors on one side are black angus cattle. I am not sure what bothers them. I know that my lawn mower does not bother them at all. I give them nicknames such as "beef stew", "Quarter pounder", "T-bone", and the big bull is of course "Big Mack". They do not seem to mind what I call them.
They all have ear tags stapled to their ears. Yet they do not seem afraid of their owners. I do not know if they understand the easy life they live now will not be very long, except for the big bull. There is a calculation about when a cow reaches market weight. For a time feeding them adds value as they put on mass. At some point they do not add mass of any value and the feed just keeps them alive. Off to market we go.
They do not have to fear predators, go hungry or get arthritis. They have a barn to get in when the weather is bad.
What this has to do with fish I do not know. I do think fish are several orders less aware that cows. For example I have caught the same fish off the same structure with the same fly a few times. Sorta makes me think the trauma of being hooked and then handled does not make a lasting impression. Or maybe the strike instinct overloads their brain??