Throwing rocks doesn’t hurt the fishing, actually I think it can help the fishing at times. When I took Andrew fishing he got bored and wanted to throw rocks in where I was fishing and so I let him, and to my surprise it actually helped the fishing. Rocks were even bouncing on the dock and that didn’t hurt either. The logic in it is, the fish know your there as soon as you walk on the dock, your in their world. If you try to be quiet, that could spook them because you would be the stalking hunter. Now it might help to be quiet for the fish that swim by, but for the fish already in the area, they are not afraid at all.
I have always known a few tricks similar to this, one is that a splash in front of a bush will bring the fish out to the front so you don’t have to fish deep inside and get snagged. Running your boat too close to the shore will push the fish up tight into the thick brush right where people flip, so they think the fish were there to begin with, but a spinnerbait and a boat not so close will do the trick much faster and it is more natural and won’t break up a feed going on. One day I was fishing an old beaver hut and the Bass were in so tight I couldn’t get them out, so I started up the big motor and pushed them out to the edges where I could catch them.
Sometimes when a wingdam dies I start up my big motor and run onver it and then start fishing again and it seems to spark life again. One day I was fishing a creek mouth and some guy came right on in there with his motor running. I had parked my boat and walked in, so I told him to do the same and he got mad and reved the engine and ran his boat all around stirring up mud and then he left. Well the fishing was never so good, I caught about 20 fish soon after because of his rage.
Fish will fool you, there is a time to be stealth, but there are times that being noisy actually helps. Sometimes just talking can help, or a radio, or a motor running, who knows, all I know is what happens sometimes.
Edit – Shotgun blasts do hurt the fishing. Yesterday was opening day for Teal season and I never caught a fish until they stopped shooting at noon.