That's a shame because the swim hole I pictured is in central NJ. It's a spring fed extremely deep old quarry hole. It does also have fish in it, though. From my earliest memories everyone in my family swam in shallow Barnegat Bay waters, the ocean, and ponds and lakes. I guess it didn't seem odd to me. I was initially afraid to do clamming, because they were the same waters you could crab. No one ever got nipped, though.