Summertime in Southern Chile means hot weather and that can mean low water and higher water temperatures. Places that hold fish in higher water can be void of fish.
When water temperatures are high, fish will seek out cooler, more oxygenated water – typically the faster water. Riffles and pocket water are good places to find fish during these times.
The water doesn’t necessarily have to be deep. You can catch fish in surprisingly shallow spots – if the current speed is decent and there’s cover like a riffle.