One summer I was recovering from a surgery and had about a month to fish every day on a small river in mid summer with very low water. The river had big smallmouth bass along with many suckers, northern pike minnow, and carp. I don't know when bass got in to the river, but when I was a kid the river only had the trash fish species. Even the game department had no idea there were bass in this river.
The water was low this time of year, and many places in the river could be crossed by jumping from one rock to the next without even getting my feet wet. The bass were concentrated in deeper holes, and each hole would have 3-5 large bass between 3 and 5 pounds, along with a few smaller bass. The water was muddy, and I couldn't see any bass, so numbers are just estimates based on catch rates.
Nobody fished this river. I fished a dozen or so, mile long stretches with each stretch having 3 to 4 fishable holes with big bass. The first time I would fish a new hole I would catch a large bass on the first cast with an inline spinner. I would fish each hole in a stretch with the spinner, then go back and fish the holes with some other bait helping me catch a couple more decent size bass.
The next day I would fish a different stretch and was able to rotate through stretches of river never fishing the same stretch twice in the same week. One day I invited a friend to go along with me and decided to take him to my very best stretch of river where I new there was at least two bass over 5 pounds and maybe more. The problem was I had fished this stretch of river hard only a couple days prior, and I was worried I hadn't rested it long enough. My worries were confirmed when we got skunked. We had enough time to try another section, of river that I hadn't fished for over a week and did well.
This same scenario repeated itself throughout the whole month I was able to fish. The minimum time to rest a particular hole and still catch one of the big bass living there was 5 days. Anything less and the fishing was slow to zero. After 5 days, first cast in to a whole I would hook one of the larger bass and if I was lucky might be able to catch one or two more before having to move on.
There was a very small population of bass in this river, and the holes were small and shallow. The northern pike minnows would hit almost every lure every cast if the bass were not biting. If there was a willing bass in a hole they would hit first cast. I'm not saying that all bass fishing waters need to be rested for a week before fishing them. Obviously this river was a rare situation, but I will say it doesn't take much angling pressure to turn bass off, or at least make them more difficult to catch.
That was 16 years ago, and as far as I know the bass are still there, and no one fishes most of the river. A few locals fish a couple easy to access spots, but besides that there are around 30 miles of river with an average of 3-4 holes per mile with one to three smallmouth bass over 3.5 pounds per hole waiting to bite the only spinner they might ever see in their whole life. Because I do hope to get a chance to walk the banks of that river catching big smallmouth again before I go on to greener pastures, I am not going to give any more details on the location of this small piece of paradise.
A good angler may be able to catch bass out of highly pressured waters, on a consistent basis, but a body of water that gets no pressure can be spectacular for even an average angler such as myself. If you are able to find and fish a lake pond or river that has quality bass and does not get any pressure, there is only one thing you can do. KEEP YOUR MOUTH SHUT.