It doesn’t sound like this is a new practice for Anthony Mackie, either. In the same appearance, he tells another story of being on set of Abraham Lincoln: Vampire Hunter where he caught a giant 5 foot 5 inch gar fish by tying the line to his truck and driving it out of the water. Apparently, Mackie tries to find time to fish whenever he sees water, it doesn’t matter what set he’s on.
Anthony Mackie’s time in the MCU is available on Disney +. You can use this link to sign up for the streaming service.