Many years ago I was watching one of the fishing shows on tv with a friend. He claimed that the shows were sometimes faked and that a diver had fish in a cage that he would hook onto their line when they casted. I'm not sure that that is the case but I'm confident that they edit out all of the times that they got skunked.
One of favorite fishing shows ever...
Jimmy Houston Outdoors
I had a friend of a friend who worked as a cameraman for Jimmy. He said it was the best and worse job he ever had. Apparently they had a lot of fun when the camera wasn't rolling which would not be suitable for TV.
However he said there were times when he would sit for hours with the film rolling and the fish were not biting.